Graphene-metal based tunable radiative metasurface for information encryption and anticounterfeiting

Wang, Pei; Su, Jinchao; Ding, Pei; Mao, Bo; Ren, Mengshuai; Xu, Kun; Tian, Shuo; Li, Yan; Tian, Ximin; Wang, Junqiao

doi:10.1016/j.diamond.2022.109548

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In the visible wavelength range, metasurfaces have been designed to generate holograms [26,29] and to serve as pixelated color displays [30,31] for encoding images. In the infrared (IR), metamaterials with thermally [20,32] and electrically [33] reconfigurable spatial emissivities have been investigated for information encoding. However, in all these cases, the images encoded on each channel can be easily retrieved by using the correct illumination, thereby compromising the security of data storage.…”

Section: Introductionmentioning

confidence: 99%

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Audhkhasi,

Povinelli

2023

Advanced Photonics Research

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The ability of metasurfaces to manipulate optical waves in the spatial and spectral domain provides new avenues for secure data storage. In this work, an encryption system consisting of an electrically tunable metasurface and a matched detector is presented for secure encryption of grayscale images in the 8–12 μm wavelength range. In the proposed scheme, the encrypted image corresponds to the spatially varying thermal intensity of the metasurface as captured by its matched detector. In contrast to previous metasurface‐based encryption schemes, the current approach leverages the full spectral response of the associated photonic devices to achieve secure encryption while circumventing the need for an increased device size. Using examples of single‐ and multi‐image encryption, it is shown that the optical properties of either the metasurface or matched detector alone do not reveal any meaningful information about the encrypted image, thereby validating the security of the proposed scheme. The electrical tunability of the metasurface provides additional security as the image can only be retrieved by operating it at a predefined voltage level. The results presented in this study provide intriguing possibilities for the development of compact and secure object tagging and anti‐counterfeiting applications in the infrared.

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Section: Introductionmentioning

confidence: 99%

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Audhkhasi,

Povinelli

2023

Advanced Photonics Research

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“…In addition, in reference [15], a tunable thermal radiation metasurface using a graphene-metal hybrid structure has been designed for infrared anticounterfeiting and information encryption with applications in energy harvesting and thermal management. Other advanced graphene-based structures are proposed and experimentally investigated in reference [16] to detect hemoglobin biomolecules based on analysis of the transmittance of the structure.…”

Section: Introductionmentioning

confidence: 99%

Wavefront Control of Millimeter Waves With a VO₂-Based Reconfigurable Meta-Reflectarray

Shameli,

Capobianco,

Schenato

et al. 2023

IEEE Access

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In this paper, a novel architecture of a reconfigurable metasurface is proposed and numerically assessed for wavefront control in wireless systems working in the millimeter-wave range. We show that a metasurface made of engineered silicon bricks covered with a thin film of vanadium dioxide provides anomalous reflection with an efficiency of 93% at 60 GHz and a relative bandwidth of 15%. After applying a thermal stimulus that triggers the transition of vanadium dioxide from the insulator phase to the metallic phase, the metasurface abruptly changes its response and provides specular reflection. The device shows high efficiency and broadband operation in both VO 2 states, allowing dynamic control of millimeter waves. Therefore, it finds applications in imaging, sensing, and intelligent wireless communications in 5G and 6G systems, especially for beam-shaping and beam-steering. Moreover, the proposed reconfigurable metasurface has a simple configuration that lends itself to standard fabrication tools, and it has a subwavelength size for integrated and compact communication systems.

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“…Working within the two atmospheric transmission bands in the IR (3 -5 µm and 8 -15 µm) may further allow remote image collection and processing with broad spectral bandwidth. To this end, the ability of IR metamaterials to achieve simultaneous spatial, spectral, and polarization control of optical waves [32][33] makes them uniquely suited for multi-channel image encryption in the infrared. Meanwhile, rapid advancements in multispectral imaging capabilities provide a method to record spatially-and spectrally-resolved information.…”

mentioning

confidence: 99%

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

Audhkhasi

Lien

Povinelli

2023

Advanced Optical Materials

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The ability to tailor light–matter interactions using artificially engineered materials has opened up new avenues for secure data storage and communication. This work presents an experimental investigation of metasurfaces for secure, multi‐channel image encryption in the infrared (IR). The proposed metasurfaces consist of an array of pixels, each designed to produce a wavelength‐ and polarization‐dependent IR absorptivity. A basis set of pixels is designed for encrypting images of arbitrary resolution on a given number of wavelength and polarization channels. These pixels are fabricated, and their spectral response is experimentally measured using Fourier transform infrared spectroscopy. The measured data is used to emulate the encryption and decryption of binary and 8‐bit grayscale images. Finally, the security of the encryption scheme proposed in this work is evaluated by performing statistical analyses on the image data stored on different channels. The results presented in this study suggest intriguing possibilities for the development of encrypted tagging technologies in the infrared and thus have implications for secure object identification and anti‐counterfeiting.

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Graphene-metal based tunable radiative metasurface for information encryption and anticounterfeiting

Cited by 8 publications

References 36 publications

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Wavefront Control of Millimeter Waves With a VO₂-Based Reconfigurable Meta-Reflectarray

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

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Graphene-metal based tunable radiative metasurface for information encryption and anticounterfeiting

Cited by 8 publications

References 36 publications

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector

Wavefront Control of Millimeter Waves With a VO2-Based Reconfigurable Meta-Reflectarray

Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared

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Wavefront Control of Millimeter Waves With a VO₂-Based Reconfigurable Meta-Reflectarray