Photon‐Induced Ultrafast Multitemporal Programming of Terahertz Metadevices

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 13, 2024

Dynamic terahertz (THz) metasurface can feature modulated and multiplexed electromagnetic functionalities, important for wave-based computation, six-generation communications, other applications. The versatile dynamic switching typically relies on a series of complex or incompatible multifield activations, with excessive system complexity, additional loss, slow modulation speed, inertial time-varying properties, limiting more widespread Here, photon-induced ultrafast programmable THz metadevice is reoprted in time-frequency dimensions polarization-decoupled temporal responses. By the pixelated design multi-materials triggering switches, multimodal transcends constraints inherent materials, enabling evolution. All resonances be independently programmed at working band from 0.6 to 2 THz. tri-temporal (with time 1.25, 1, 4.75 ps) bi-temporal 2.25 manipulations are performed by all-optical driven molecularization process hybrid metasurfaces loaded silicon (Si) germanium (Ge) under different polarizations. Combining these features, temporally logic gates last experimentally demonstrated, possessing basic operation XNOR, NOR, OR, as proof-of-concept application. This reported light-driven flat-optics allows processes new possibilities miniaturized, flexible, multifunctional, integrated devices.

Language: Английский

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Liquid Crystal Integrated Dynamic Terahertz Metalenses

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: July 24, 2024

Abstract Metasurfaces can freely manipulate the wavefront of electromagnetic waves with merits minimization and integration. Dynamic metadevices have continued to be urgently pursued realize on‐demand functionalities. Among them, dynamic metalenses attracted particular attention due their widespread applications, especially in promising terahertz region. Here, a liquid crystal integrated metalens focusing properties is proposed. Subwavelength silicon columns are specifically designed set same lens phase profile for orthogonal linear polarizations, while rotation additionally introduces spin‐selective conjugated geometric phase. A photopatterned layer added compensate phase; therefore, polarization‐independent single focus achieved. With saturated bias applied crystal, compensation vanishes; bifocal function realized. When polarization grating profiles encoded separately, longitudinal lateral spin‐dependent separations demonstrated. The electrically switched between single‐focus functions. utilized depth‐of‐field imaging telecom port selection. design endows various existing

Language: Английский

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Hydrogel‐Waveguiding On‐Chip Meta‐Optics for Dynamic Multicolor Holography

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 16, 2024

Abstract On‐chip integrated meta‐optics hold tremendous potential for optical imaging and display applications compatible with photonic devices. Despite recent endeavors in multi‐dimensional image display, it remains a challenge to realize dynamic holography on‐chip integration scheme facile accessible tuning approach. Herein, an hydrogel‐waveguiding platform single‐step fabrication is demonstrated colorful holography. By exploiting the tunable property of waveguiding hydrogel, hydrogel metasurface enables concealment ON/OFF dual‐channel holographic switch within 310 ms through simple exhalation process. Furthermore, utilizing dispersion correlation between extraction efficiency relative humidity, color‐mixed encrypted successfully exhibited at specific humidity condition. Beyond conventional static monochromatic holography, such enjoys satisfactory humidity‐responsivity, high capability, full‐color potential, zero‐order diffraction interference‐free, which suggests active information concealment/encryption, next‐generation wearable AR

Language: Английский

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Active control of terahertz quasi-BIC and asymmetric transmission in a liquid-crystal-integrated metasurface

Photonics Research, Journal Year: 2024, Volume and Issue: 12(10), P. 2207 - 2207

Published: July 23, 2024

Quasi-bound states in the continuum (quasi-BICs) offer an excellent platform for flexible and efficient control of light-matter interactions by breaking structural symmetry. The active quasi-BIC device has great application potential fields such as optical sensing, nonlinear optics, filters. Herein, we experimentally demonstrate terahertz (THz) induced polarization conversion a liquid crystal (LC)-integrated metasurface, which consists symmetrically broken double-gap split ring resonator (DSRR), LC layer, double graphite electrodes. In process orientation under external field, realizes from OFF state to ON state. state, no effect, behaves non-resonant state; but exhibits obvious resonance. Furthermore, achieve asymmetric transmission based on polarization-induced modulation precisely at resonance position, its isolation can be controlled field. study dynamic LC-integrated metasurface introduces very promising route THz devices, guarantees applications communications, switching, sensing systems.

Language: Английский

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Broadband Rapid Polarization Manipulation and Imaging Based on Pancharatnam‐Berry Optical Elements

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Abstract Polarization imaging, which can reveal indiscernible information that cannot easily be detected with traditional intensity cameras, plays a crucial role in many research fields. There are two main types of polarization imaging methods: time‐division multiplexed and space‐division imaging. These methods confront the problems temporal spatial resolution reduction. In this work, rapid linear‐polarization arbitrary manipulation technique based on Pancharatnam–Berry Optical Elements is proposed achieved as an module speed up to 899 Hz. Applying compact modulator optical or microscopic systems establish rapid, high‐resolution system. This method verified at detection, indoor outdoor photographic experiments, visible near‐infrared bands, exhibiting excellent results. It proven valid approach solve major dilemma incompatibility between it also highlights potential multidimensional applications.

Language: Английский

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A terahertz full-adder based on VO2-integrated cascaded metasurfaces

Optics Communications, Journal Year: 2025, Volume and Issue: unknown, P. 131863 - 131863

Published: April 1, 2025

Language: Английский

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Reconfigurable Intelligent Metasurface Technology for Terahertz Communication

Springer proceedings in physics, Journal Year: 2025, Volume and Issue: unknown, P. 608 - 623

Published: Jan. 1, 2025

Language: Английский

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Terahertz programmable metasurface for phase modulation based on free carrier plasma dispersion effect

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(25)

Published: June 17, 2024

Active metasurfaces utilize semiconductor carrier modulation, offering an approach for spatial light modulation with advantages in speed, efficiency, and power consumption. Here, we present a method designing programmable that leverage the plasma dispersion effect of semiconductors to tune terahertz wave phase. By integrating PN junction into metasurface unit adjusting relative permittivity through voltage control, reflected phase can be effectively manipulated. The designed enables continuous up 270° around 0.4 THz, average reflection efficiency 30% potential speed GHz range. Additionally, by configuring different distributions, steer beams at angles, achieving far-field radiation peak gain 13 dB. This proposed shows great applications communication imaging.

Language: Английский

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Plug-and-play terahertz multifunctional metadevices based on metal waveguide arrays and 3D printed structures

Virtual and Physical Prototyping, Journal Year: 2024, Volume and Issue: 19(1)

Published: Nov. 28, 2024

The emergence of metadevices has provided an unprecedented ability to manipulate electromagnetic waves, especially in the terahertz band where natural materials are scarce. However, most have fixed and singular functions after fabrication, making them challenging adapt various application scenarios. paper proposes a reconfigurable multifunctional platform that integrates metal waveguide arrays with 3D printed structures, capable independently simultaneously manipulating polarisation, phase, amplitude two orthogonally polarised waves. For proof-of-concept experimental demonstration, featuring polarisation selection, beam deflection, dual-channel imaging designed, fabricated, characterised. By replacing reconfiguration between different is achieved, control efficiency exceeding 60%. Compared traditional semiconductor processing methods, this modular design approach not only more cost-effective but also adaptable, it highly suitable for applications requiring large-scale metadevices.

Language: Английский

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