Optical Information Encryption Based on Secret Sharing Liquid Crystal Elements with Spatial Dislocation

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)

Published: May 3, 2024

Abstract Optical encryption is an increasingly significant technique in the realm of information security. In recent decade, there has been considerable interest using planar optics elements for encryption. However, leakage possibly occurs due to limited encrytion channels available single‐layer devices. To circumvent this problem, a novel method put forward secret sharing cascaded liquid crystal (LC) with spatial dislocation, which can produce near‐field patterns and far‐field holographic images under different illumination conditions. Specifically, Malus's Law its inherent one‐to‐four mapping rotational degeneracy, along Pancharatnam‐Berry (PB) phase introduced by LC molecules, achieve multi‐channel are utilized. Therefore, each unit manipulate amplitude imparted output light independently, thus only obtaining both devices decryption be realized. further enhance security, author purposely divide device into multiple regions find that encrypted recovered when two align precisely specific dislocation. These experimental measurements agree well design, demonstrating strong capability broad application prospects design approach field optical high cost‐effectiveness.

Language: Английский

---

Photonic Spin‐Hall Logic Devices Based on Programmable Spoof Plasmonic Metamaterial

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(8)

Published: April 9, 2024

Abstract The entanglement of the momentum light with its spin at interfaces or inside structured media, known as photonic spin‐Hall effect, holds great promise for various applications, such beam splitting, focusing, and polarization detection. However, effect remains unexplored in field logic operation. In this work, spoof surface plasmon polaritons (SSPPs) programmable metamaterial is demonstrated. Moreover, devices based on plasmonic are designed, enabling control energy flow through utilization both digital coding, examples including SSPPs gates “AND” gate, “NIMPLY” gate (A AND NOT B), “OR” “NOT” gate. findings introduce combination coding Hall which offers a powerful flexible platform controlling electromagnetic waves information processing.

Language: Английский

---

Reprogrammable Vector Optical Field Meets Planar Liquid Crystal Elements for Enhanced Security in Holography

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract As information security becomes an increasingly challenging and highly prioritized issue, optical holographic encryption has recently attracted significant attention. In particular, vector holography exploits the properties of light to overcome limitations traditional scalar holography, enhancing dimensionality improving security. However, current methods focus solely on design metasurfaces or liquid crystal (LC) devices, without fully considering interaction between incidence device, thereby limiting available channels. Vector field, which arbitrarily designed wavefronts polarization state distributions, provides greater degrees control than uniform field. this work, integrates with field propose secure by directly encoding into a reprogrammable incidence. This method involves dividing distributing secret among various carriers, namely LC analyzer. By orientation analyzer's transmission axis, multi‐channel is achieved utilizing static device. The proposal promising pathway for advancing encryption, strengthening authentication capabilities, overall

Language: Английский

---

Optical Binary Operator Based on Thermally Controllable Chiral Superstructures

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

By harnessing multiple dimensions of light to implement mathematical functions, structured optical materials introduce a twist in the paradigm informatics, shifting from "displaying with light" "computing light". One vital subset operators is binary operators, whose output depends on two inputs, such as Boolean logic. Herein, we propose and demonstrate an operator based thermally controllable chiral nanostructures. engineering anisotropic materials, determined by interplay between inputs; furthermore, accompanying Pancharatnam-Berry phase unlocks additional computing functionalities. The customized modulation orbital angular momentum intensity distribution enables operations integers images. tunable operating spectrum spans ultrawide range over 1600 nm visible near-infrared region. This study reveals new opportunities for soft matter may facilitate diverse applications machine vision artificial intelligence.

Language: Английский

---

Minimalist design of multifunctional metasurfaces for helicity multiplexed holography and nanoprinting

Optics Express, Journal Year: 2024, Volume and Issue: 32(15), P. 26359 - 26359

Published: July 1, 2024

Recently, polarization multiplexing has become a common strategy to enhance the information capacity of metasurfaces. Nevertheless, intricate design anisotropic nanostructures forming multiplexed metasurface poses significant challenge, increasing requirements for manufacturing processes and diminishing overall robustness. Herein, we present minimalist comprised only two kinds achieve integration continuous-amplitude modulated nanoprinting eight-step phase-only helicity-multiplexed holography. Specifically, image governed by Malus's law can be observed in orthogonally polarized light path, while holographic images switched changing chirality incident circularly light. More importantly, geometric phase propagation are optimized simultaneously according target images. Thus, does not require optimizing many but needs nanostructures, that significantly relieves fabrication burden. Moreover, proposed methodology is universal applicable also other multi-channel technologies. Consequently, scheme holds promising applications display, encryption, data storage, anti-counterfeiting, more.

Language: Английский

---

Bi-functional and tri-channel image displays based on a single-size nanostructured metasurface enabled by dual-orientation-degeneracy

Optics Express, Journal Year: 2024, Volume and Issue: 32(24), P. 42336 - 42336

Published: Oct. 23, 2024

Benefiting from the extraordinary ability of manipulating lightwaves at subwavelength scale, nanostructured metasurfaces are expected to achieve multifunctional and multichannel integration expand functionality increase information capacity. However, always consist various anisotropic nanostructures, inevitably bringing challenges design fabrication. In this study, we propose a concept dual-orientation-degeneracy containing twofold orientation degeneracy. The first-level degeneracy is one-to-four mapping scheme between intensity Channel 1 angle second-level refers one-to-two 2 angle. Additionally, provide minimalist bi-functional tri-channel image displays based on single-size metasurface. designed metasurface integrates two functionalities nanoprinting holography, which can generate continuous grayscale meta-image, binary meta-image phase-only holographic image. Three channel be readily switched by polarization controls. More importantly, achieved merely reconfiguring angles nanostructures with fixed geometries, relieving structure fabrication burden. presented strategy universal applicable, contribute advanced research applications in ultra-compact displays, high-dense optical storage, multi-folded anti-counterfeiting, etc.

Language: Английский

---

Three-dimensional spatial differentiation based on a single metalens

Optics Express, Journal Year: 2024, Volume and Issue: 33(2), P. 1669 - 1669

Published: Dec. 17, 2024

Spatial differentiation is the key element for edge detection and holds unquestionable significance in current information era. All-optical computation based on metasurfaces has emerged as a powerful platform spatial due to its advantage of high integration parallel processing. However, while most works focus one- or two-dimensional (2D) differentiation, three-dimensional (3D) all-optical compact differentiator remains elusive. In this work, by leveraging handedness multiplexing through combination Pancharatnam–Berry (PB) propagation phases, we propose demonstrate high-integrated meta-differentiator system single multifocal metalens. This can simultaneously achieve 3D imaging detection, i.e., work objects at varying distances with functionality being switchable merely changing incident light, which significantly extends capacity from 2D plane comprehensive space. expansion not only broadens operational domain but also accelerates speed We anticipate will provide exciting opportunities advance application computation, processing, advanced imaging.

Language: Английский

---

All-dielectric metasurface for polarization-multiplexed single-pixel imaging

Journal of Optics, Journal Year: 2024, Volume and Issue: 26(8), P. 085104 - 085104

Published: July 9, 2024

Abstract Integration and miniaturization of multi-channel single-pixel imaging systems have become a developing trend. However, it is challenging to meet such development needs solely relying on traditional optical devices. One feasible solution the utilization metasurfaces with multiplexing functionality. Here, we propose validate an all-dielectric, anisotropic metasurface that provides random mask polarization for single pixel imaging. The design ensures each contains 50% target information, allowing adaptive correlated different targets without needing redesign masks. By optimizing metasurface, enhance computational efficiency by preventing correlation between channels patterns. We also adjust parameters compressed sensing algorithm accommodate various sampling rates, ensuring high-quality image reconstruction. Additionally, whole system simulated angular spectrum transmission reconstruction algorithm, providing results sizes, demonstrating feasibility proposed approach. It noteworthy designed works single-wavelength operation could be extended multispectral introducing achromatic technology. method miniaturize devices reduce light loss.

Language: Английский

---

Upper limit on the polarization-assisted amplitude modulation capability of cascaded single-cell wave-plate-like metasurfaces

Optics Express, Journal Year: 2024, Volume and Issue: 32(16), P. 28611 - 28611

Published: July 18, 2024

The Jones matrix method offers a robust framework for designing polarization multiplexed metasurfaces (PMMs). Traditional PMMs design involves initially defining functions and working channels, then mapping feature to adjustable parameters of metasurfaces. However, this approach makes it difficult predict how channels affect metasurface features. Here, we employ the generalized Malus law Rodriguez rotation on Poincare Sphere analyze diverse channels' impact PMMs' amplitude modulation capacity. For single-celled waveplate-like PMMs, up three distinct images can be displayed. We demonstrate in both theoretic numerical simulations. Our study establishes multi-channel metasurfaces, applicable information encryption, optical computation, diffraction neural networks, etc.

Language: Английский

---

Tri-channel metasurface fusion of continuously varying gray levels for nanoprinting and holographic displays

Optics Express, Journal Year: 2024, Volume and Issue: 32(21), P. 36976 - 36976

Published: Sept. 11, 2024

Metasurfaces are extensively utilized in nanoprinting and hologram fusion displays due to their superior wavefront shaping capabilities. However, the creation of continuously varying grayscale images based on conventional Malus's law necessitates use at least one polarizer for observation, which compromises metasurface's integration. In this study, inspired by Jacobi-Anger expansion, we propose a tri-channel metasurface establish three independent information channels simultaneous polarization multiplexed holography. By meticulously designing sizes orientation angles nanostructures, multifunctional can generate image observable near-field without any control, simultaneously reconstruct two distinct holographic far-field under incident light conditions. With its advantages ultra-compactness, high capacity, flexible design, ease proposed holds significant promise potential applications three-dimensional stereoscopic displays, multiplexing storage, beyond.

Language: Английский

---