Semimetal–dielectric–metal metasurface for infrared camouflage with high-performance energy dissipation in non-atmospheric transparency window

Nanophotonics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract The development of novel camouflage technologies is great significance, exerting an impact on both fundamental science and diverse military civilian applications. Effective aims to reduce the recognizability object, making it effortlessly blend with environment. For infrared camouflage, necessitates precise control over surface emissivity temperature ensure that target blends effectively surrounding background. This study presents a semimetal–dielectric–metal metasurface emitter engineered for application camouflage. metasurface, total thickness only 545 nm, consists Bi micro-disk array continuous ZnS Ti film beneath it. Unlike conventional metal-based design, our approach leverages unique optical properties Bi, achieving average 0.91 in 5–8 μm non-atmospheric transparency window. Experimental results indicate achieves lower radiation actual temperatures compared those observed comparative experiments, highlighting its superior energy dissipation thermal stability. offers advantages such as structural simplicity, cost-effectiveness, angular insensitivity, deep-subwavelength features, rendering suitable range applications including anti-counterfeiting, potential broad deployment technologies.

Language: Английский

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Polarization‐Independent Dispersive Complex‐Amplitude Modulation via Anisotropic Metasurfaces

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

Published: Jan. 11, 2025

Abstract Polarization‐independent characteristic is highly desirable for practical applications, and metasurfaces, it typically achieved through isotropic structures. This inevitably leads to a lost degree of freedom (DoF) within the parameter space, thereby restricting realization advanced functionalities in polarization‐independent regime. Here, counterintuitively, dispersive complex‐amplitude modulation via single‐layered anisotropic metasurface. By fully exploiting in‐plane DoFs previously unattainable can be without adding additional challenges metasurface manufacturing. The underlying mechanism relies on optimization superimposed Jones matrix meta‐molecule, which demonstrates identical behavior under pair orthogonal polarization bases. As proof concept, color printing numerically experimentally demonstrated, completely different from resonant structural that depends spectral characteristic. Moreover, integration near‐field printing, far‐field holography, an achromatic multi‐port beam splitter with arbitrary power ratio are demonstrated as well. proposed platform opens up new doors designing compact meta‐devices, holding various applications augmented‐reality displaying, information communication, optical security.

Language: Английский

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Advanced Physical Layer Metasurface‐Empowered Cryptography with Robustness, High Capacity, and Enhanced Security

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

Published: Jan. 13, 2025

Abstract Physical layer metasurface‐empowered cryptography offers a novel approach to secure encryption. This study proposes an encryption method with robustness, high capacity, and enhanced security based on the dual‐band complex‐amplitude metasurface. By leveraging American Standard Code for Information Interchange (ASCII), both secret message compressed digital signature are encrypted transmitted together, eliminating codebook transmission reducing risks. The modified Visual Secret Sharing (VSS) scheme is employed strengthen security, fidelity, robustness. Additionally, three‐dimensional wavefront reconstruction algorithm used increase multivariate key provides extra of protection. A prototype metasurface sample designed, fabricated, characterized as proof‐of‐concept demonstration. measured results closely match numerical ones design objective, confirming viability resilience this high‐capacity, applications in anti‐counterfeiting data transmission.

Language: Английский

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The second optical metasurface revolution: moving from science to technology

Nature Reviews Electrical Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Language: Английский

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Ultrafast Metaphotonics

Ultrafast Science, Journal Year: 2024, Volume and Issue: 4

Published: Jan. 1, 2024

The exploration of optical and photonic phenomena, particularly the modulation pulse signals ultrafast control light fields at extreme temporal spatial scales, substantially enhances our understanding light–matter interactions broadens scope potential applications inspired by metamaterials metasurfaces. In this perspective, we highlight advancements in metaphotonics introducing shaping using metadevices. We begin with a detailed exposition principles metasurfaces evaluate their role manipulating high-frequency terahertz bands, emphasizing importance optics. then present several methods for controlling output response metadevices external physical or phase-change materials to achieve active Finally, anticipate prospects field terms fundamental research practical applications. integration these 2 disciplines will drive vibrant developments across multiple fields, including biology, chemistry, science.

Language: Английский

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High‐Isolation Multidimensional Holography Multiplexing in Non‐Interleaved Metasurfaces

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 25, 2025

Abstract Metasurfaces have revolutionized holography by enabling high‐density channel multiplexing, positioning them as promising candidates for applications in full‐color holographic imaging, optical data storage, and encryption. However, conventional non‐interleaved metasurfaces face limitations the number of controllable dimensions, restricting channels available each dimension. Here, a novel high‐dimensional multiplexing scheme is introduced that significantly enhances both capacity isolation metasurfaces. By integrating Rayleigh‐Sommerfeld diffraction (RSD) formula into Gerchberg‐Saxton (GS) algorithm incorporating gradient descent optimization, approach achieves precise phase profile control across multiple dimensions—extending parameters to include wavelength, polarization state, spatial distance. This method enables simultaneous three channels, wavelength two focal plane distances, producing total 18 distinct, well‐isolated with minimal crosstalk. These results showcase powerful capabilities this metasurface design, underscoring its potential advance color secure high‐capacity information transmission, thereby contributing development next‐generation intelligent devices.

Language: Английский

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Angle‐Tolerant Circular Eigenpolarizations Enabled by Orientational Disorder in Dielectric Metasurfaces

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract Tailored structural disorder in photonic metasurfaces enables advanced light shaping. Specifically, an orientational chiral nanostructures leads to circular eigenpolarizations with a heavily suppressed linear birefringence. The is, therefore, vital observing purely chiroptical effects such as dichroism and optical activity. Here, it is experimentally numerically demonstrated that all‐dielectric orientationally disordered bilayer square array preserve highly for wide range of incidence angles. angle‐dependent performance compared their C 2 4 symmetric periodic counterparts, demonstrating the structures provide nearly pure across larger angles wavelengths, whereas ones do not. These findings underscore ability tailored enhance robustness engineered responses highlight its potential flat, integrable, efficient components, polarizers beam splitters.

Language: Английский

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Nonvolatile switchable dual-functional THz metamaterial with selective transmission and adjustable absorption empowered by q-BICs

Optics Express, Journal Year: 2025, Volume and Issue: 33(3), P. 6505 - 6505

Published: Jan. 30, 2025

The integration of tunable characteristics and dual functions into a single terahertz (THz) metamaterial is quickly becoming major focus research. This paper presents nonvolatile switchable dual-functional THz with selective transmission adjustable absorption based on quasi-bound states in the continuum (q-BICs), where q-BICs are achieved through periodically arranged silicon disks tetramer. By introducing asymmetry perturbation manipulating radii diagonal proposed metamaterial, resulting transition from symmetry-protected bound (SP-BICs) to q-BICs. When middle layer Ge 2 Sb Te 5 (GST) amorphous state, achieved, which can be applied as bandstop filter. Additionally, by transforming phase GST crystalline state way heating, behaves an absorber due generations Fabry-Pérot resonance (FPR) mode. Multipole decomposition temporal coupled-mode theory (CMT) explain underlying physics. Our work provides valuable insights metamaterials empowered

Language: Английский

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Hybrid Metasurface Based on Si₃N₄ Nanopillar for Optical Sensing with Dual Channels

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Language: Английский

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Conformal Radiation-type Programmable Metasurface for Agile Millimeter-Wave OAM Generation

Research, Journal Year: 2025, Volume and Issue: 8

Published: Jan. 1, 2025

Since the scarcity of bandwidth resources has become increasingly critical in modern communication systems, orbital angular momentum (OAM) with a higher degree freedom information modulation promising solution to alleviate shortage spectrum resources. Consequently, integration OAM millimeter-wave technology emerged as focal point next-generation research. Recently, programmable metasurfaces have gained considerable attention essential devices for generation due real-time tunability, but their profiles are relatively high result external feed source. This paper proposes conformal radiation-type metasurface operating band. By employing series–parallel hybrid network replace conventional sources, overall profile system can be reduced less than 0.1 λ . Furthermore, proposed innovation design could also achieve cross-shaped architecture, which is ultraportable and very effective integrating front ends satellites or aircraft eliminating issues such source blockage well energy spillover losses metasurfaces. The realized gain 22.54 dB an aperture efficiency 21.75%, thus generating high-purity waves topological charges l = 0, +1, +2, +3. Additionally, by incorporating beam scanning techniques, deflected accommodate scenarios moving receivers, demonstrating substantial potential future high-speed wireless applications.

Language: Английский

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