Metasurface‐Assisted Indirect‐Observation Cryptographic System

Li, Jiaxin; Guan, Zhiqiang; Liu, Hong‐Chao; He, Zhixue; Li, Zile; Yu, Shaohua; Zheng, Guoxing

doi:10.1002/lpor.202200342

Cited by 16 publications

(5 citation statements)

References 45 publications

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“…As a proof of concept, the generated polarization profile of hybrid GPVVB is manipulated by an HWP. Liquid crystals and phase change materials-based design can be combined to build a more compact platform for sensing 30,31 and optical encryption applications 32,33 . This work offers not only a new insight into structured lightmatter interactions but also a new degree of freedom to boost optical and quantum information capacity.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Dynamic Control of Hybrid Grafted Perfect Vector Vortex Beams

Ahmed¹,

Ansari²,

Li³

et al. 2022

Preprint

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Perfect vector vortex beams (PVVBs) with inhomogeneous polarization and spiral phase profiles have attracted considerable interest due to their peculiar optical features. PVVBs are typically generated through the superposition of perfect vortex beams, which suffer from the limited number of topological charges (TCs) in the involved vortex beams. To meet the requirement of time-varying systems, dynamic control of PVVBs is desirable and hasn’t been demonstrated. A grafted perfect vortex beam (GPVB) is an artificially engineered vortex beam with multiple TCs that are impossible with a conventional vortex beam. Here, for the first time, we propose and experimentally demonstrate hybrid grafted perfect vector vortex beams (GPVVBs) and the dynamic control of these beams. Hybrid GPVVBs are generated through the superposition of new hybrid GPVBs with a novel multifunctional metasurface. The generated hybrid GPVVBs possess spatially variant rates of polarization change in 2D space due to the involvement of more TCs. Remarkably, each hybrid GPVVB features multiple different GPVVBs in the same beam, adding more design flexibility. Furthermore, these beams are dynamically tuned with a rotating half waveplate, making the metasurface function as a dynamic optical device. The generated dynamic GPVVBs may find applications in the fields where dynamic control is in high demand, including optical encryption, dense data communication, and multiple particle manipulation.

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Section: Discussion and Outlookmentioning

confidence: 99%

Dynamic Control of Hybrid Grafted Perfect Vector Vortex Beams

Ahmed¹,

Ansari²,

Li³

et al. 2022

Preprint

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show abstract

“…For instance, by utilizing multiple optical channels with different wave vectors, , orbital angular momentums, , polarizations, , or surroundings, , plaintext information can be encrypted into a single metasurface, making the information only visible under specific optical conditions. Furthermore, a combination of encoding techniques, such as Muller matrix modulation, computer imaging algorithm, diffraction algorithm, and Caesar cipher, augments the citadel of information security by avoiding direct observation of plaintext.…”

Section: Introductionmentioning

confidence: 99%

Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Wang,

Niu,

Zhao

et al. 2024

ACS Photonics

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Information security is of vital importance in daily life, stimulating various cryptographic strategies to protect data from leaking. Among them, metasurface-based optical encryption is an excellent candidate because of its unique features, including numerous encoding channels and incomparable light-field manipulation ability. However, for state-of-the-art metasurface encryption, it is still critical to further improve its storage efficiency with high security for practical information-storage applications. Here, combining data compression and optical encryption, compression-encrypted meta-optics (CEM) is proposed to improve the regular metasurface storage efficiency by an order of magnitude while maintaining high information security. Utilizing lossless compression algorithms, the plaintexts are re-encoded into nonintuitive ciphertexts and keys with much less data volume (∼1/10), thus providing the first security barrier and increasing storage efficiency. Moreover, the polarization-encrypted metasurfaces also protect the ciphertexts from direct observation, providing a second security barrier. Overall, such a CEM with two security barriers significantly improves the optical storage efficiency and presents a novel route for potential applications in next-generation optical information storage/encryption.

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“…[1][2][3] By simulating the propagation and interference of object light waves Metasurface, [4][5][6][7][8] a two-dimensional artificial material characterized by an array of subwavelength structures sitting on a planar substrate, has shown its unprecedented ability to precisely manipulate the fundamental optical parameters of incident light waves. [9][10][11][12][13] There are abundant achievements in the study of phase [14][15][16][17][18][19][20] and amplitude [21][22][23][24][25] modulation by metasurfaces. Compared with phase-or amplitude-only meta-elements, [26][27][28][29][30][31][32][33] complex-amplitude meta-elements have attracted extensive interest due to their ability to independently and flexibly manipulate the two important optical parameters, i.e., amplitude and phase.…”

Section: Introductionmentioning

confidence: 99%

Full Complex‐Amplitude Engineering by Orientation‐Assisted Bilayer Metasurfaces

Deng

Guan

et al. 2023

Advanced Optical Materials

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through numerical calculation, one can encode the amplitude and phase of light waves into a CGH, and finally reconstruct the three-dimensional (3D) light field carrying object information through optical diffraction. In this process, a functional element with precise complex-amplitude modulation is the key to the digital encoding of holograms and the modulation of light waves. The modulation ability of light waves affects the numerical characteristics and reconstruction effect of holograms. An ideal complex-amplitude hologram can record the complex-amplitude information including the amplitude and phase of the object. However, since most of the existing optical elements such as conventional hologram recording with photographic negative, diffractive optical elements, and spatial light modulator (SLM) can only modulate the amplitude or phase of light wave, the hologram needs to be converted from the complex-amplitude to the pure amplitude or phase accordingly. With the development of new artificial materials such as metasurfaces, complex-amplitude hologram coding technology has attracted more and more attention due to its high spatial bandwidth product and high reconstruction accuracy.Optical complex-amplitude determines the propagation behavior of light in free space to the maximum extent. Precise control of complex-amplitude is the key to generating user-defined light fields. Current attempts to control optical complex-amplitude using metasurface, however, either have limited amplitude/phase step numbers or lost high lateral resolution since amplitude and phase are usually manipulated with size-varied nanostructures or several nanostructures integrated into a unit-pixel. Here, it is shown that bilayer metasurface can readily decouple optical amplitude and phase, thus achieving arbitrary complex-amplitude modulation only by arranging the orientation angles of nanostructures. In this design, each unit-pixel in one layer has only one nanostructure with the same size, thus significantly increasing the lateral resolution of complex-amplitude modulation. More importantly, the approach of controlling optical complex-amplitude merely by changing nanostructure orientation can significantly simplify the metasurface design and aggrandize the fabrication tolerance, thus enhancing the robustness of metasurfaces toward practical applications.

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Metasurface‐Assisted Indirect‐Observation Cryptographic System

Cited by 16 publications

References 45 publications

Dynamic Control of Hybrid Grafted Perfect Vector Vortex Beams

Dynamic Control of Hybrid Grafted Perfect Vector Vortex Beams

Compression-Encrypted Meta-Optics for Storage Efficiency and Security Enhancement

Full Complex‐Amplitude Engineering by Orientation‐Assisted Bilayer Metasurfaces

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