Invisible photonic printing: computer designing graphics, UV printing and shown by a magnetic field

Hu, Haibo; Tang, Jian; Zhong, Hao; Xi, Zheng; Chen, Changle; Chen, Qianwang

doi:10.1038/srep01484

Cited by 100 publications

(94 citation statements)

References 40 publications

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“…Colloidal photonic crystals have been tailored to possess combinatorial codes which are hidden in normal conditions and selectively disclosed under specific conditions for advanced security . Such photonic encryption can be promising for strict security protection of masterpieces and confidential documents.…”

Section: Introductionmentioning

confidence: 99%

Lithographically Encrypted Inverse Opals for Anti-Counterfeiting Applications

Heo

Kang

Lee

et al. 2016

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Colloidal photonic crystals possess inimitable optical properties of iridescent structural colors and unique spectral shape, which render them useful for security materials. This work reports a novel method to encrypt graphical and spectral codes in polymeric inverse opals to provide advanced security. To accomplish this, this study prepares lithographically featured micropatterns on the top surface of hydrophobic inverse opals, which serve as shadow masks against the surface modification of air cavities to achieve hydrophilicity. The resultant inverse opals allow rapid infiltration of aqueous solution into the hydrophilic cavities while retaining air in the hydrophobic cavities. Therefore, the structural color of inverse opals is regioselectively red-shifted, disclosing the encrypted graphical codes. The decoded inverse opals also deliver unique reflectance spectral codes originated from two distinct regions. The combinatorial code composed of graphical and optical codes is revealed only when the aqueous solution agreed in advance is used for decoding. In addition, the encrypted inverse opals are chemically stable, providing invariant codes with high reproducibility. In addition, high mechanical stability enables the transfer of the films onto any surfaces. This novel encryption technology will provide a new opportunity in a wide range of security applications.

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Section: Introductionmentioning

confidence: 99%

Lithographically Encrypted Inverse Opals for Anti-Counterfeiting Applications

Heo

Kang

Lee

et al. 2016

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“…Another approach is printing with invisible inks that can be revealed under ultraviolet light [18]. An additional process (after the fabrication) is needed to color the object with UVvisible inks.…”

Section: Related Workmentioning

confidence: 99%

AirCode

Nair

Nayar

et al. 2017

Proceedings of the 30th Annual ACM Symposium on User Interface Software and Technology

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air pocket optimization fabricated model AirCode embeded input mesh user-specified region & data goo.gl/1ph6g2 global component a c d e b Figure 1. (a) AirCode tagging tool takes as inputs a mesh, a user-specified region, and embedded data. (b) It first determines the air pocket parameters, including the depth d and thickness h, for a fabrication material. (c) An AirCode tag is embedded inside the object, without changing its geometry or appearance. (d) The fabricated tag is invisible under environmental lighting. (e) Using our imaging system that separates out the global scattering effects, the user detects the embedded tag and retrieve the data. "Moai" by gravityisweak / CC BY 3.0 / modified from original. ABSTRACTWe present AirCode, a technique that allows the user to tag physically fabricated objects with given information. An Air-Code tag consists of a group of carefully designed air pockets placed beneath the object surface. These air pockets are easily produced during the fabrication process of the object, without any additional material or postprocessing. Meanwhile, the air pockets affect only the scattering light transport under the surface, and thus are hard to notice to our naked eyes. But, by using a computational imaging method, the tags become detectable. We present a tool that automates the design of air pockets for the user to encode information. AirCode system also allows the user to retrieve the information from captured images via a robust decoding algorithm. We demonstrate our tagging technique with applications for metadata embedding, robotic grasping, as well as conveying object affordances.

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“…3); the permittivity, ϵ; or the index of refraction, n, including composite crystals (Fig. 1), can exhibit invisible photonic printing, particularly useful for steganography and watermarking for anticounterfeiting and other novel applications (Fudouzi and Xia 2003;Dolling et al 2006;Ge 2011, 2012;Hu et al 2013). In addition, and as implicit in Fig.…”

Section: Photonic Metamaterials and Nanophotonic Device Conceptsmentioning

confidence: 99%

Photonic Materials and Structures

Murr¹

2015

Handbook of Materials Structures, Properties, Processing and Performance

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Invisible photonic printing: computer designing graphics, UV printing and shown by a magnetic field

Cited by 100 publications

References 40 publications

Lithographically Encrypted Inverse Opals for Anti-Counterfeiting Applications

Lithographically Encrypted Inverse Opals for Anti-Counterfeiting Applications

AirCode

Photonic Materials and Structures

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