Holography and the Luxury Industry - Communication - MDPI
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hv photonics Communication Holography and the Luxury Industry V. Michael Bove, Jr. * and Nicole A. Reader Modern Mirror, Inc., New York, NY 10018, USA; nicole.reader@themodernmirror.com * Correspondence: vmbove@themodernmirror.com Abstract: The luxury goods industry and holography have a lengthy history together. In this article, we review the applications of holography to the industry and the relevant technical requirements, in particular when the hologram itself is the luxury item, when the hologram is used to promote luxury items, and when the hologram is used for authentication of luxury items. We then explore some possible scenarios for the evolution of this relationship. Keywords: holography; 3D imaging; 3D display; optical authentication; retail applications of photonics 1. Introduction Holography, which embodies a three-dimensional image in a thin surface, either acting as a window to a virtual volume behind the hologram plane or projecting a 3D image in space in front of the hologram, was a groundbreaking imaging technology as well as a cultural artifact influencing thought about the intersection of physical and virtual worlds long before the arrival of the modern conceptions of augmented reality or virtual reality. A number of authors, in particular Sean Johnston [1,2], have written at length about the simultaneous scientific and artistic impact of holograms. The commercial impact of holography as a general imaging medium—as opposed to specialized technical applications—has, however, been at best relatively modest. The luxury industry, which prizes both craftsmanship and innovation, has on multiple Citation: Bove, V.M., Jr.; Reader, N.A. occasions turned to holography for its unique visual experiences and/or for its technical Holography and the Luxury Industry. affordances. While Johnston’s books and authoritative references on holographic applica- Photonics 2021, 8, 219. https:// tions [3,4] mention a few examples of holograms in luxury, the present authors observe doi.org/10.3390/photonics8060219 that despite the long history, there does not appear to have been a comprehensive study published focusing on this particular field of application. In this article, we will examine Received: 16 May 2021 the history of the use of holography in this industry and the experiential and technical Accepted: 10 June 2021 requirements, then look into how some current technological developments may lead to Published: 13 June 2021 increasing use of display holography in luxury. The authors prefer to reserve the use of the word “hologram” to refer to true holograms, Publisher’s Note: MDPI stays neutral which create a three-dimensional light field through the use of extremely fine diffraction with regard to jurisdictional claims in patterns, but (like the general public) the industry has more often than not used the published maps and institutional affil- term to refer to other stereoscopic or multiscopic 3D display technologies, augmented iations. or virtual reality headsets or mobile apps, or even ethereal 2D displays such as Pepper’s Ghosts or projections onto fog screens. Indeed, a recent search of the archives of the publication Luxury Daily for articles mentioning “hologram” turned up 66 entries, none of which relates to a diffractive technology [5]. In addition to true holograms, we will also Copyright: © 2021 by the authors. consider some notable examples of pseudo-holograms that were applied when a particular Licensee MDPI, Basel, Switzerland. hologram-like experience was desired but true holograms were not practical. This article is an open access article distributed under the terms and 2. Application Domains conditions of the Creative Commons Attribution (CC BY) license (https:// The personal luxury goods industry is usually regarded as combining the sectors of creativecommons.org/licenses/by/ designer clothing and footwear, luxury bags and accessories, luxury watches and jewelry, 4.0/). and luxury fragrances and cosmetics, and in fiscal 2019, had sales of US$281B [6]. Photonics 2021, 8, 219. https://doi.org/10.3390/photonics8060219 https://www.mdpi.com/journal/photonics
The personal luxury goods industry is usually regarded as combining the s designer clothing and footwear, luxury bags and accessories, luxury watches and and luxury fragrances and cosmetics, and in fiscal 2019, had sales of US$281B [6] Photonics 2021, 8, 219 There have been three main applications of holographic technology 2 of 10 in th business: where the hologram is the luxury item itself (or at least a component where the hologram is used in the promotion of luxury items, and where the hol used as part There haveof anti-counterfeiting been or traceability three main applications of holographicof luxury items. technology These in the luxury will be d in separate business: subsections. where the hologram is the luxury item itself (or at least a component thereof), where the hologram is used in the promotion of luxury items, and where the hologram is used as part of anti-counterfeiting or traceability of luxury items. These will be discussed 2.1. Holograms as Luxury Merchandise in separate subsections. Foil embossed with holographic diffraction patterns (to be discussed in mo 2.1. in Holograms as Luxuryhas a later section) Merchandise been applied to garments to create an iridescent effect, Foil embossed with holographic dimensional rainbow images or patterns. diffraction patterns While (toembossed be discussedholograms in more detailhad bee in a later section) has been applied to garments to create an iridescent effect, or three- used as appliques on garments [7], a company called Space dimensional rainbow images or patterns. While embossed holograms had been earlier Time was the first to a process used for on as appliques creating garmentsmass-produced [7], a company calledholographic Space Time wasfabrics (including the first to develop viscose a thane)for process and then mass-produced creating releasing in 1989 a line of holographic garments fabrics based (including on and viscose the urethane) material [8,9]. and thendrew terial releasing in 1989attention wider a line of garments when based on the material it appeared [8,9]. This Vivienne in designer material Wes drew wider attention when it appeared in designer Vivienne Westwood’s Spring/Summer Spring/Summer 1998 collection (Figure 1). A newer generation of diffractive fab 1998 collection (Figure 1). A newer generation of diffractive fabrics has been embraced by been embraced fashion by fashion in recent years; in recent particularly years; in the Fall 2018particularly season, when in suchthe Fall 2018 fabrics season, wh appeared fabrics appeared in the runway collections of numerous designers in the runway collections of numerous designers and brands including Tom Ford, Gucci, and brands in Lanvin, Maison Tom Ford, Margiela, Gucci, and Off-White Lanvin, Maison[10].Margiela, and Off-White [10]. Figure Figure 1. Dress 1. Dress mademade from diffractive from diffractive fabric Westwood’s fabric in Vivienne in Vivienne Westwood’s1998 Spring/Summer Spring/Summer collection 19 tion. (Photo (Photo ©FirstVIEW/IMAXtree.com, ©FirstVIEW/IMAXtree.com, used with permission.) used with permission). Volume reflection (Denisyuk) holograms (Figure 2) [11] have been made into earrings, Volume reflection (Denisyuk) holograms (Figure 2) [11] have been made pendants, watch faces, and other jewelry (Figure 3), often by holographers themselves rings,than rather pendants, by jewelrywatch faces, companies [12].and other While jewelry (Figure photopolymers 3), silver or bleached oftenhalide by holographe can selves rather than by jewelry companies [12]. While photopolymers or bleached s be used in this application, the preferred material is dichromated gelatin as it provides particularly ide can bebright usedimages in this[13], although image application, quality frommaterial the preferred holographic jewelry can stillgelatin is dichromated be problematic because it requires direct illumination, which may not be the situation vides particularly bright images [13], although image quality from holographic when holograms are being worn on the body. One well-known branded example of a can still bejewelry holographic problematic because product is it hologram-faced a series of requires direct illumination, watches that Fossilwhich releasedmay in not b uation the whenaholograms early 1990s; are reissue limited to being worncame 654 watches on the body. out in One well-known branded 2019 [14]. of a holographic jewelry product is a series of hologram-faced watches that Fossil in the early 1990s; a reissue limited to 654 watches came out in 2019 [14].
Photonics 2021, 8, 219 3 of 10 Photonics 2021, Photonics 2021, 8, 8, xx FOR FOR PEER PEER REVIEW REVIEW 33 of of 10 10 Figure Figure2.2. Figure 2.Creating Creatingaaareflection Creating reflectionvolume reflection volumehologram: volume hologram:laser hologram: laserillumination laser illuminationisis illumination isbrought broughttoto brought toaaaphoto-sensitive photo-sensitive photo-sensitive plate plate from the opposite side as the object; when the resulting hologram is illuminatedwith plate from from the theopposite opposite side sideas asthe theobject; object;when when the theresulting resulting hologram hologram is illuminated is illuminated withwhite with white white light light from from the the same same side side as as the the original original laser, laser, a a 3D3D image image ofof the the object object isis reconstructed. reconstructed. light from the same side as the original laser, a 3D image of the object is reconstructed. Figure 3. Figure 3. Couture 18K 18K gold ring ring set with with diamonds, opal, opal, and and aa dichromated dichromated gelatin gelatin reflection reflection hol- hol- Figure 3. Couture Couture 18Kgold gold ringset set withdiamonds, diamonds, opal, and a dichromated gelatin reflection ogram encapsulated ogram encapsulated in fused in fused silica. silica. Created Created by Mirasety, by Mirasety, a collaboration a collaboration of Francesco of Francesco Mazzero, Mazzero, Mi- Mi- hologram encapsulated in fused silica. Created by Mirasety, a collaboration of Francesco Mazzero, chael Crawford, and August Muth. (Courtesy Mirasety, photo by Francesco chael Crawford, and August Muth. (Courtesy Mirasety, photo by Francesco Mazzero.) Mazzero.) Michael Crawford, and August Muth (Courtesy Mirasety, photo by Francesco Mazzero). 2.2.Holograms 2.2. 2.2. Hologramsin Holograms inLuxury in LuxuryMerchandise Luxury MerchandisePromotion Merchandise Promotion Promotion Creditedasas Credited Credited asthe thefirst the first first successful successful successful use use use of of of holography holography holography to promote to promote to promote luxury luxury luxury merchandise, merchandise, merchandise, a 50-aa 50-by-60 50-by-60 by-60 cm pulsed-laser cm pulsed-laser cm pulsed-laser transmission transmission transmission hologram hologram hologram of of theof the Leith the and Leith Leith and Upatnieks and Upatnieks Upatnieks type (Figure type (Figure type (Figure 4) [15] 4) 4) [15] [15] was was made made for for Cartier Cartier in in 1972 1972 by by G. G. Robert Robert Schinella Schinella at at McDonnell McDonnell was made for Cartier in 1972 by G. Robert Schinella at McDonnell Douglas Missouri, show- Douglas Douglas Mis- Mis- souri, souri, ing showing showinghand a woman’s a woman’s a woman’s wearing hand hand wearing a wearing ring a diamond diamond a diamond ring and ring and and holding holding a diamond holding bracelet a diamond a diamond bracelet bracelet (Figure 5). (Figure (Figure This 5). was5). This was This mounted was mounted inmounted the window in the in the window of window Cartier’sof of Cartier’s Cartier’s Fifth Avenue Fifth Fifth Avenue Avenue location location in location New in City, in York New New York and York City, and because City, and because of this ofhologram’s sort of because of this sort this sort of of requirement hologram’s requirement hologram’s requirement for aa monochromatic for a monochromatic for monochromatic light source, waslight light source, was illuminated source, wasbyilluminated a mercuryby illuminated by arcaa lamp. mercury mercury arc Thearc lamp. hand The hand appeared lamp. The hand appeared 36 cm forward appeared 36on 36 cmthe cm forward window forward on[1] on the the window (pp. window [1] (pp. 352–353). [1] (pp. 352–353). 352–353). Another store-window appearance of holography in the luxury jewelry domain that is regarded as iconic by many holographers came in conjunction with the late-1986 opening of Tiffany’s on Old Bond Street in London. The company Holovision was commissioned to produce a holographic homage to the well-known scene from the film Breakfast at Tiffany’s. In the hologram, the woman at the table wears a necklace by Paloma Picasso and is surrounded by Tiffany’s merchandise. Design work was by holographer Martin Richardson and the 50-by-60 cm image was captured in the pulsed-laser studio at the Royal College of Art and then transferred to a white-light-viewable transmission plate that was back-illuminated by a spotlight and placed in the shop window.
Photonics 2021, 8, x FOR PEER REVIEW 4 of 1 Photonics 2021, 8, x FOR PEER REVIEW 4 of 10 Photonics 2021, 8, 219 4 of 10 Figure Figure4. Figure Creating 4.4.Creating Creating and and andviewing an off-axis viewing viewing an off-axis transmission an off-axis hologram: transmission transmission hologram: photo-sensitive hologram: materialreceives photo-sensitive photo-sensitive material receives material receive an aninterference interference interference pattern pattern pattern between between betweenaareference reference a referencebeam beam andlight and beam light and reflected reflected light from from an an reflected object. object. from When an When the the When object. re- the re sulting sultinghologram resulting hologram hologram is illuminated is is illuminated illuminatedwith thethe with with same the wavelength same same wavelength wavelengthof monochromatic of monochromatic lightlight of monochromatic at the at same theat light po- same the same po sition sitionasas position the as thereference the reference reference beam, beam,a 3D beam, aimage a 3D image 3D ofofthe image ofobject the isisreconstructed object the object reconstructed and andvisible is reconstructed andthrough visible visiblethe through theplate. plate. the plat through Figure 5. Pulsed-laser hologram made for Cartier window display, 1972. (Photo credit: MIT Mu- seum, gift of Marian B. Javits, photo by Barry Heatherington.) Figure5.5.Pulsed-laser Figure Pulsed-laser hologram hologram mademade for Cartier for Cartier windowwindow display, display, 1972 1972. (Photo credit:(Photo credit: MIT Mu MIT Museum, Another store-window appearance of holography in the luxury jewelry domain that seum, gift of gift ofB.Marian Marian Javits, B. Javits, photo by photo Barry by Barry Heatherington.) Heatherington). is regarded as iconic by many holographers came in conjunction with the late-1986 open- ing of Tiffany’s on Old Bond Street in London. The company Holovision was commis- Unlike the store-window scene in the film, the hologram showed the woman from the back, and sionedAnother to produce a holographicappearance homage to the ofwell-known holography in the scene fromluxury jewelry the film Breakfastdomain tha The British Journal of Photography reported at the time, “It is apparently driving the is regarded as iconic by many holographers came in conjunction at Tiffany’s. In the hologram, the woman at the table wears a necklace by Paloma Picasso with the late-1986 open Tiffany staff gently mad because people keep coming into the shop wanting to see the ing is and ofsurrounded Tiffany’s on by Old Bondmerchandise. Tiffany’s Street in London. The company Design work Holovision was by holographer was commis Martin other side—the girl’s face. This of course is exactly what it was designed to do—get people sioned Richardson in.” [16]. to produce a holographic and the 50-by-60 cm image homage to the was captured well-known scene in the pulsed-laser from the studio atfilm theBreakfas Royal College at Tiffany’s. of Art and In the maker In 1989, hosiery then hologram, transferred to a white-light-viewable the woman atHolographics Hue commissioned the table wears transmission a necklace North plate by Paloma at an estimated cost Picass that and of was back-illuminated is surrounded $10,000 by a by Tiffany’s to create a 76-by-102 spotlight and merchandise. cm transmission placed in the shop Design rainbow white-light window. work was by holographer hologram showing Marti Unlike Richardson several the andscene thein50-by-60 angle-multiplexed the film, of images thea leg cm hologram image model wasshowed in the captured tights. Thiswoman in the was from the as back, pulsed-laser installed and studio a point-of- at th The sale British display Journal in of Photography Bloomingdale’s in Newreported York at Citythe time, [17]. “It is apparently driving the Tif- Royal College of Art and then transferred to a white-light-viewable transmission plat fany Because staff gently of itsmad cost,because people complexity, andkeep coming rarity, into theportraiture holographic shop wanting tosort of the see discussed the other that was back-illuminated by a spotlight and placed in the shop window. aboveUnlike might itself be considered the scene a luxury in the film, good. In recent the hologram showedyears thedigital woman holograms from the(toback, an The British Journal of Photography reported at the time, “It is apparently driving the Tif fany staff gently mad because people keep coming into the shop wanting to see the othe
of $10,000 to create a 76-by-102 cm transmission white-light rainbow hologram showin several angle-multiplexed images of a leg model in tights. This was installed as a point of-sale display in Bloomingdale’s in New York City [17]. Because of its cost, complexity, and rarity, holographic portraiture of the sort dis Photonics 2021, 8, 219 5 of 10 cussed above might itself be considered a luxury good. In recent years digital hologram (to be discussed below) have been used for portraiture in addition to pulsed laser analo holograms [3] (pp. 306–312) [4] (pp. 512–515). Perhaps the best known example is a 200 be discussed digital below) have holographic beenofused portrait for portraiture Queen Elizabeth IIincaptured addition tobypulsed laser analog holographer Rob Munda holograms as 205 parallax images, this also appeared as an embossed hologram (toisbe [3] (pp. 306–312) [4] (pp. 512–515). Perhaps the best known example a 2004 discussed i digital holographic portrait of Queen Elizabeth II captured by holographer Rob Munday as the following section) on a 2012 £10 postage stamp issued by Jersey Post [4] (p. 612). 205 parallax images, this also appeared as an embossed hologram (to be discussed in the The development of full-color digital holographic printing in the late 1990s and earl following section) on a 2012 £10 postage stamp issued by Jersey Post [4] (p. 612). 2000s, Thewith its abilityoftofull-color development create arbitrarily large white-light-viewable digital holographic printing in the late 1990sreflection hologram and early 2000s, with its ability to create arbitrarily large white-light-viewable reflection holograms model without the need of a holography studio—only requiring 3D computer graphics or sets of without the2D need parallax views of studio—only of a holography scenes—greatly increased requiring the potential 3D computer graphics availability models of ho or sets of 2D lography as aparallax views of promotional scenes—greatly medium increased However, [4] (pp. 507–511). the potential so availability of far, this process doe holography as a promotional medium [4] (pp. 507–511). However, so far, this not appear to have been much used in the luxury goods business, one example application process does not appear to have beenbeing in apparel/footwear much used in the a series ofluxury goods business, large display one example holograms by XYZapplication Imaging in 2005 in apparel/footwear being a series of large display holograms by XYZ Imaging in 2005. Three 1-by-1.2 m prints and one 1-by-1.5 m print were produced for Puma’s campaign fo Three 1-by-1.2 m prints and one 1-by-1.5 m print were produced for Puma’s campaign for their Ferrari branded footwear and placed in two Montreal Foot Locker stores during th their Ferrari branded footwear and placed in two Montreal Foot Locker stores during the MontrealGrand Montreal Grand Prix Prix in in June June 20052005 (Figure (Figure 6). Imagery 6). Imagery included included close-ups close-ups of shoesof with shoes with racetrack in the background, and a car morphing into a shoe. In a racetrack in the background, and a car morphing into a shoe. In a similar promotional a similar promotiona campaignforfor campaign Nike, Nike, fourfour large-format large-format holograms holograms were produced were produced for the store for the Niketown Niketown on stor on Oxford Oxford StreetStreet in London in London [18]. [18]. Figure6.6.Digital Figure Digital holographic holographic print print of Ferrari of Ferrari shoes,shoes, 2005. (Courtesy 2005 (Courtesy GeolaUAB). Geola Digital Digital UAB.) When Whenholography holography is mentioned, is mentioned,fashion writers fashion often often writers recall supermodel Kate Moss’ recall supermodel Kate Moss virtual, ethereal appearance at Alexander McQueen’s autumn/winter 2006 “Windows virtual, ethereal appearance at Alexander McQueen’s autumn/winter 2006 “Windows o of Culloden” collection show in Paris (Figure 7), though that was actually a pyramidal Culloden” collection show in Paris (Figure 7), though that was actually a pyramidal con configuration of the 19th-century stage illusion called a Pepper’s Ghost rather than an figuration actual of the hologram 19th-century [19]. McQueen had stage illusion interest a continued called ainPepper’s Ghost rather holographic-style than an actua experiences; hologram for example[19]. McQueentohad the invitation his aspring/summer continued interest in holographic-style 2009 show was a lenticular experiences; portrait fo example the invitation to his spring/summer 2009 show was a lenticular (incorrectly described in the press as a hologram) in which the designer’s face morphs intoportrait (incor arectly described stylized skull [20].in the press as a hologram) in which the designer’s face morphs into Thereskull stylized are several [20]. possible geometries for Pepper’s Ghosts; when a virtual model is to share a stage with a live model, the setup in Figure 8 is commonly employed [21]. When based on 2D video projections, as in the examples discussed here, the images are flat rather than 3D, and work best for stationary viewers at distances where 3D visual cues do not operate strongly.
Photonics 2021, 8, 219 6 of 10 Photonics 2021, 8, x FOR PEER REVIEW 6 of 10 Figure 7. “Holographic” (actually Pepper’s Ghost) model in 2006 Alexander McQueen show. (Photo ©FirstVIEW/IMAXtree.com, used with permission.) There are several possible geometries for Pepper’s Ghosts; when a virtual model is to share a stage with a live model, the setup in Figure 8 is commonly employed [21]. When based on 2D video projections, as in the examples discussed here, the images are flat rather than 3D, and work best for stationary viewers at distances where 3D visual cues do not operate strongly. Figure Figure 7.7.“Holographic” “Holographic”(actually (actuallyPepper’s Pepper’sGhost) Ghost)model modelinin 2006 2006 Alexander Alexander McQueen McQueenshow show.(Photo (Photo ©FirstVIEW/IMAXtree.com,used ©FirstVIEW/IMAXtree.com, usedwith withpermission). permission.) There are several possible geometries for Pepper’s Ghosts; when a virtual model is to share a stage with a live model, the setup in Figure 8 is commonly employed [21]. When based on 2D video projections, as in the examples discussed here, the images are flat rather than 3D, and work best for stationary viewers at distances where 3D visual cues do not operate strongly. Figure 8. Pepper’s Ghost illusion based on projector and tilted beamsplitting mirror, showing how a real and a virtual person can appear to share a stage. From [21]. Figure 8. Pepper’s Ghost illusion based on projector and tilted beamsplitting mirror, showing how a real and a virtual person can appear to share a stage. From [21]. It was not long before “hologram” fashion exhibitions went from luxury to mainstream. A year after the Alexander McQueen show, retailer Target staged an all-Pepper’s-Ghost It was not long before “hologram” fashion exhibitions went from luxury to main- show in New York City’s Grand Central Station [22]. However, Pepper’s Ghosts have stream. A year after the Alexander McQueen show, retailer Target staged an all-Pepper’s- continued to feature in luxury goods exhibition; recent examples include a display at the Ghost show in New York City’s Grand Central Station [22]. However, Pepper’s Ghosts 2017 Los Angeles premiere of the film The Last Jedi of Christian Louboutin shoe designs have continued to feature in luxury goods exhibition; recent examples include a display inspired by the heroines of the Star Wars films [23], and a 2018 Christian Dior show in at theFigure 2017 Los Angeles premiere 8. Pepper’s ofbased the film The Last Jedi of beamsplitting Christian Louboutin shoe how Shanghai in whichGhost illusion 68 models captured onon projector video at and thetilted Musee d’Orsay inmirror, showing Paris were shown designs on a 30 m-long stage with 20 projectors [24]. When based on 2D video projections,Dior a inspired real and a by the virtual heroines person can of the appear Star to Wars share a films stage. [23], From and [21]. a 2018 Christian as in the showabove in Shanghai examples, in which 68 models the images are notcaptured 3D, and on workvideo bestatforthe Musee d’Orsay stationary viewersinatParis distances It was not long before “hologram” fashion exhibitions went from luxury to main- where 3D visual cues do not operate strongly. stream. TheA year“hologram” term after the Alexander has also McQueen been moreshow, retailer recently Target stagedapplied and inaccurately an all-Pepper’s- to other Ghost show in New non-holographic luxuryYork City’s Grand experiences suchCentral Station as virtual [22]. However, or augmented Pepper’s reality Ghosts applications have continued to feature in luxury goods exhibition; recent examples that allow viewing merchandise from a variable viewpoint, visualizing it in the user’s include a display at the 2017 Los environment, Angeles premiere or virtually trying it onof (for the example, film The shoes Last Jedi of Christian or eyewear) [25].Louboutin shoe designs These non-diffractive approaches are worth discussing in this context asChristian inspired by the heroines of the Star Wars films [23], and a 2018 they point Dior to show in Shanghai in which 68 models captured on video at the some characteristics desired by the luxury goods industry: the imagery should be moving Musee d’Orsay in Paris
Photonics 2021, 8, 219 7 of 10 and actual size (or larger), there should be no obvious display system but rather the imagery should appear in a physical environment, and the display should be deployable on a fashion show runway, in a retail setting, or (in the case of AR apps) in the user’s environment. For holography to supplant displays like Pepper’s Ghosts it will have to develop in these directions. 2.3. Holograms as Authentication Devices Losses in the luxury goods market due to counterfeit merchandise were estimated at US$98B in 2017 [26]. An ideal authentication technology would be one that is inexpensive to manufacture but difficult and expensive to duplicate, that cannot be removed or altered without obvious damage, and whose validity can be quickly verified. Authentication technologies are commonly classified into overt and covert categories, the former of which can be authenticated without any specialized equipment or process and the latter requiring some external apparatus for verification. Currency, for example, typically has a combi- nation of overt and covert features. Because of the fine detail and physical properties of diffraction patterns, holograms can provide both a quickly recognizable and colorful 3D visual appearance and any of a number of hidden properties including text at a scale of tens of microns, images that appear only when a laser is used for illumination, and machine-readable data patterns. Holograms with both covert and overt features have been used by the luxury goods industry at least since the early 2000s when Fendi, Gucci, and others began adding holographic labels to merchandise [27]. Chanel bags are individually numbered and since 2000, the label has incorporated a holographically-patterned film over the conventionally-printed serial number to increase the difficulty of counterfeiting; numerous websites explain how to authenticate these labels (e.g., [28]). Because a diffraction pattern may be created by varying the thickness of a transparent material, it is possible to mass produce phase holograms inexpensively by a hot-stamping process. The first step is the creation of a surface-relief holographic pattern, typically in a photoresist material exposed with a deep-blue laser. Because photoresists are too soft to be used directly for stamping, nickel is electrically deposited on the original hologram and the resulting metal layer can be applied as a stamping die, or for high volume production further replicated many times to make a set of identical stamping dies. The stamper is heated and used to impress the holographic pattern onto a transparent or foil-backed thin plastic layer. More detail on the process is given in [29]. Readers will likely be familiar with the appearance of this sort of hologram as an anti-counterfeiting feature on credit cards. Since for overt authentication the hologram must be viewable under white light, traditionally the source phase hologram is a “rainbow” hologram of the type first developed by Benton; the original process for making these involves first creating a standard off-axis transmission hologram of the subject matter and then making a second hologram of the first hologram illuminated through a slit aperture [30]. These holograms are bright but exhibit parallax in only the horizontal direction and the monochromatic image color changes with vertical viewing position; it is possible to create these holograms with multiple simultaneous hues though viewer-position-independent true-color imagery is not practical when this form of hologram is created optically. Almost as soon as embossed holograms were commercialized, techniques for illicitly replicating them were developed, and an “arms race” between counterfeiters and the developers of authentication holograms has been underway since the late 1980s [31]. While some of the source holograms for authentication tags continue to be produced using traditional “analog” exposure methods and physical objects, typically the phase hologram used for the stamping die is now created by other means. Dot matrix hologram printers use interference to generate an array of microscopic diffractive patches whose orientations and spatial frequencies can be varied, allowing the creation of true-color patterns [32], while e-beam lithography can be used to write arbitrary computer-generated diffraction patterns directly, giving a maximum degree of flexibility of imagery [33].
Photonics 2021, 8, 219 8 of 10 All of the above mass-production techniques have the limitation that the holograms produced are identical; the company Optrace has developed a system that can print serialized security holograms for luxury goods and other products in photopolymer at the rate of 10,000 holograms/hour and has also demonstrated the incorporation of unique QR codes and covert features [34]. 3. Discussion: Looking Forward With respect to display holography, fashion and other luxury goods applications have aimed for unique, creative, and innovative visual experiences, using other technologies when true holography could not be employed. Ongoing development of digital holog- raphy and some parallel technological advances in other fields should permit a broader applicability of diffractive displays in coming years. Even for still images, scene capture has always been a limiting factor for commercial holography. In the analog case, powerful lasers are needed to illuminate the scene and items in the scene cannot move during the exposure more than a small fraction of the wavelength of the light; this means that particularly for scenes with human models or even just fabrics, pulsed-laser exposure is required, and there have never been more than a few commercial pulsed-laser holographic studios in operation at any given time. Additionally, exposure and processing of very large photographic plates creates further complications. Digital holographic prints relax these limitations, as they can scale to large sizes (full-size prints of cars have been made, for example) and can be generated from a dense array of 2D parallax views (still a bit of a photo-studio challenge) or from 3D models of the scene [35]. At the time of the initial development and commercial push of holographic printing, though, computer graphics models of human figures and of luxury merchandise were not widely available and computational requirements made drape simulations of garments a challenge. More recently, submillimeter-accurate body scanning has enabled the creation of extremely realistic poseable and animatable human body models (Figure 9) and advances in graphics processors have meant that ultra-realistic dynamic simulation of the mechanical and optical properties of garments and accessories has become possible even on PCs. Modern Mirror is able to capture textured 3D meshes of fashion models or of shoppers, dress them with digital versions of real merchandise, and render the results in real time [36]. Photonics 2021, 8, x FOR PEER REVIEW Because of the underlying high-quality 3D data, this sort of process is suited for 3D 9displays of 10 such as digital holograms as well as 2D images. Figure 9. Virtual Figure fashion: 9. Virtual stills fashion: from stills anan from animated animatedvideo videorendered renderedfrom from3D 3D body body scan and 3D scan and 3Dgarment gar- ment model. (Courtesy Modern Mirror, Inc. New York, NY 10018, USA.; garment design by model (Courtesy Modern Mirror, Inc. New York, NY 10018, USA; garment design by Noe Bernacelli). Noe Bernacelli.) Though the rapidly growing amount of 3D imagery means that there will likely be more use of holographic prints in the luxury goods world in the near future, the ultimate goal remains a dynamic holographic display. Holographic video displays have existed for
Photonics 2021, 8, 219 9 of 10 Though the rapidly growing amount of 3D imagery means that there will likely be more use of holographic prints in the luxury goods world in the near future, the ultimate goal remains a dynamic holographic display. Holographic video displays have existed for many years, and like holographic prints, they do not require scene capture with coherent light sources but rather can create diffraction patterns from 3D models or parallax image sets [37]. Because of the requirement for submicron-scale pixels in the display device, inexpensively scaling up the necessary electro-optic components (in particular, diffractive spatial light modulators) to the sizes of the still hologram and Pepper’s Ghost examples described above continues to be a topic for research and development. In the meantime, luxury brands have begun exploring the use of non-holographic light field 3D displays [38]; the same data sources used for those displays can be used to generate digital holographic video as well when suitable displays reach the market. Author Contributions: Conceptualization, V.M.B.J. and N.A.R.; investigation, V.M.B.J. and N.A.R.; writing—original draft preparation, V.M.B.J. and N.A.R.; writing—review and editing, V.M.B.J. and N.A.R. All authors have read and agreed to the published version of the manuscript. Funding: This research received no external funding. Acknowledgments: The authors wish to thank the following individuals for their assistance with the preparation of this article: Patrick Boyd, Michael Crawford, David Brotherton-Ratcliffe, Joy Javits, Sean Johnston, Sam Moree, August Muth, Martin Richardson, Seth Riskin and colleagues at the MIT Museum, Jonathan Ross, and Richard Sharpe. Conflicts of Interest: The authors declare no conflict of interest. References 1. Johnston, S.F. Holographic Visions: A History of New Science; Oxford University Press: Oxford, UK, 2006. 2. Johnston, S.F. Holograms: A Cultural History; Oxford University Press: Oxford, UK, 2016. 3. Saxby, G.; Zacharovas, S. Practical Holography; CRC Press: Boca Raton, FL, USA, 2016. 4. Bjelkhagen, H.; Brotherton-Ratcliffe, D. Ultra-Realistic Imaging; CRC Press: Boca Raton, FL, USA, 2013. 5. Luxury Daily. Available online: https://www.luxurydaily.com/?s=hologram (accessed on 27 April 2021). 6. Deloitte Global. Global Powers of Luxury Goods 2020. Available online: https://www2.deloitte.com/content/dam/Deloitte/at/ Documents/consumer-business/at-global-powers-luxury-goods-2020.pdf (accessed on 15 March 2021). 7. Walash, E. Holograms Beam Into Fashion. WWD, 5 December 1988; Volume 156. 8. Sharpe, R.A.; Manners, M.J. Holographic Image Containing Foil-Textile Laminate. U.S. Patent 5,593,765, 14 January 1997. 9. Sharpe, R.A.; Zenessex, Essex, UK. Personal communication, 2021. 10. Brannigan, M. Designers want you coated in shimmery, holographic iridescence for fall. Fashionista, 2 March 2018. Available online: https://fashionista.com/2018/03/fashion-week-fall-2018-trend-iridescent-holographic-fabric (accessed on 15 March 2021). 11. Denisyuk, Y.N. On the Reproduction of the Optical Properties of an Object by the Wave Field of its Own Scattered Radiation. Opt. Spectrosc. 1963, 18, 365–368. 12. Bold, K. Lighter Side of Jewelry: With Holograms Adorning Traditional Accessories, Finery Takes on a 3rd Dimension. Los Angeles Times, 5 June 1992. 13. Rallison, R.D. The History of Dichromates. Available online: https://wasatchphotonics.com/wp-content/uploads/The-History- of-Dichromates1.pdf (accessed on 1 May 2021). 14. Murphy, M. It All Began with a Hologram. The New York Times, 23 November 2019. 15. Leith, E.N.; Upatnieks, J. Wavefront Reconstruction with Diffused Illumination and Three-Dimensional Objects. J. Opt. Soc. Amer. 1964, 54, 1295–1301. [CrossRef] 16. Rix, J. Exposure. The British Journal of Photography, 13 March 1987. 17. Edelson, S. Hologram casts hue in fashion. Adweek’s Marketing Week, 9 October 1989; Volume 41, P10. 18. Zacharovas, S.J.; Brotherton-Ratcliffe, D. A Digital Printing System for the Commercial Production of High-Resolution True- Colour Reflection Holograms. 2005. Available online: https://geola.com/wp-content/uploads/2015/10/Holopack_holoprint_ 2005_Geola.pdf (accessed on 15 March 2021). 19. Williams, E. How we made Alexander McQueen’s Kate Moss hologram. Creative Review, 15 March 2015. Available online: https://www.creativereview.co.uk/alexander-mcqueens-kate-moss-hologram/ (accessed on 15 March 2021). 20. Cartner-Morley, J. Alexander McQueen: Into the light. The Guardian, 10 February 2015. 21. Crowder, A.; Conway, B.; Senkiewicz, T.P. Travel Case for Portable Pepper’s Ghost Illusion Setup. U.S. Patent 10,384,144 B2, 20 August 2019.
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