Electrically tunable optical metasurfaces

Photonics Insights, Journal Year: 2024, Volume and Issue: 3(3), P. R07 - R07

Published: Jan. 1, 2024

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Environmental permittivity-asymmetric BIC metasurfaces with electrical reconfigurability

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 15, 2024

Abstract Achieving precise spectral and temporal light manipulation at the nanoscale remains a critical challenge in nanophotonics. While photonic bound states continuum (BICs) have emerged as powerful means of controlling light, their reliance on geometrical symmetry breaking for obtaining tailored resonances makes them highly susceptible to fabrication imperfections, generally fixed asymmetry factor fundamentally limits applications reconfigurable metasurfaces. Here, we introduce concept environmental by embedding identical resonators into surrounding medium with carefully placed regions contrasting refractive indexes, activating permittivity-driven quasi -BIC (ε- q BICs) without altering underlying resonator geometry unlocking an additional degree freedom through active tuning dielectric environment. We demonstrate this integrating polyaniline (PANI), electro-optically polymer, achieve electrically ε- BICs. This integration not only demonstrates rapid switching speeds exceptional durability but also boosts system’s optical response perturbations. Our strategy significantly expands capabilities resonant permittivity modulation, opening avenues on-chip devices, advanced sensing, beyond.

Language: Английский

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Organic Metasurfaces with Contrasting Conducting Polymers

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

Published: Jan. 6, 2025

Conducting polymers have emerged as promising active materials for metasurfaces due to their electrically tunable states and large refractive index modulation. However, existing approaches are often limited infrared operation or single-polymer systems, restricting versatility. In this Letter, we present organic featuring dual conducting polymers, polyaniline (PANI) poly(3,4-ethylenedioxythiophene) (PEDOT), achieve contrasting dynamic optical responses at visible frequencies. Sequential electrochemical polymerizations locally conjugate subwavelength-thin layers of PANI PEDOT onto preselected gold nanorods, creating electro-plasmonic antennas with distinct optoelectronic properties. This dual-polymer approach enables metasurface pixel control without individual electrode routing, thereby simplifying designs. The exhibit dual-channel functions, including anomalous transmission holography, through the redox-state switching both polymers. Our work underscores potential applications, offering a pathway advanced reconfigurable devices

Language: Английский

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An Electrochemically Programmable Metasurface with Independently Controlled Metasurface Pixels at Optical Frequencies

Nano Letters, Journal Year: 2024, Volume and Issue: 24(32), P. 9961 - 9966

Published: July 12, 2024

Metasurfaces have revolutionized optical technologies by offering powerful, compact, and versatile solutions to control light. Conducting polymers, characterized their conjugated molecular structures, facilitate charge transport exhibit interesting electrical, optical, mechanical properties. Integrating conducting polymers with metasurfaces can unlock new opportunities functionalities in modern optics. In this work, we demonstrate an electrochemically programmable metasurface independently controlled pixels at frequencies. Electrochemical modulation of locally polyaniline on gold nanorods, which are arranged addressable electrodes according the Pancharatnam-Berry phase design, enables dynamic over into configurations. With same device, showcase diverse functions, including beam diffraction varifocal lensing along off axis. The synergy between flat optics polymer science holds immense potential enhance performance function versatility metasurfaces, paving way for innovative applications.

Language: Английский

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Electro‐Active Metasurfaces Controlling Exceptional Topological Phase Through Low‐Voltage Operation on Conductive Polymer

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

Published: June 3, 2025

Abstract Metasurfaces have been actively studied for their compact form factor and multifunctionality. However, limited number of channels lack active modulation significantly constrain practical applications. To address these drawbacks, this study investigates electro‐active chiral optical response (EACOR)‐driven metasurfaces with dual channels, fast electrical switching rates 52 ms, a low operating voltage 0.5 V. The EACOR‐driven dual‐channel utilize reflective‐type metal‐insulator‐metal (MIM) structure integrated thin polyaniline (PANI) film as an insulator layer gold (Au) nanostructures meta‐atoms. Au meta‐atoms exhibit response, creating channel based on the polarization incident light. Additionally, refractive index change PANI in to applied induces variation proposed structure, making another controlled by voltage. For concept validation, electrically metahologram is demonstrated. Such driven open new pathway encryption display

Language: Английский

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Engineering of Active and Passive Loss in High-Quality-Factor Vanadium Dioxide-Based BIC Metasurfaces

Nano Letters, Journal Year: 2024, Volume and Issue: 24(35), P. 10742 - 10749

Published: Aug. 27, 2024

Active functionalities of metasurfaces are growing interest in nanophotonics. The main strategy employed to date is spectral resonance tuning affecting predominantly the far-field response. However, this barely influences other essential properties like near-field enhancement, signal modulation, quality factor, and absorbance, which all vital for numerous applications. Here we introduce an active metasurface approach that combines temperature-tunable losses vanadium dioxide with coupling tunable symmetry-protected bound states continuum. This method enables exceptional precision independently controlling both radiative nonradiative losses. Consequently, it allows adjustment response and, notably, characteristics local field enhancement absorbance. We experimentally demonstrate continuous from under- through critical- overcoupling, achieving factors 200 a relative switching contrast 78%. Our research marks significant step toward highly metasurfaces, near- properties.

Language: Английский

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Tunable metasurface devices based on soft matter

Semiconductors and semimetals, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский

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Achieving Ideal Magnetic Light Emission with Electric-Type Emitters

Nano Letters, Journal Year: 2024, Volume and Issue: 24(42), P. 13315 - 13323

Published: Oct. 9, 2024

Optical magnetic dipole (MD) emission predominantly relies on emitters with significant MD transitions, which, however, rarely exist in nature. Here, we propose a strategy to transform electric (ED) one by elegantly coupling an ED emitter silicon nanoparticle exhibiting strong resonance. This mode transformation enables artificially ideal source purity factor of up 99%. The far-field patterns such artificial sources were experimentally measured, which unambiguously resolved their magnetic-type origin. study opens the path achieving nonmagnetic emitters, largely extending availability light conventionally limited Beyond fundamental significance science, anticipate that this will also facilitate development optical nanosource and enable potential photonic applications relying emission.

Language: Английский

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Wearable variable-emittance devices—The future of dynamic personal thermoregulation

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(18)

Published: Oct. 28, 2024

Using infrared electrochromism as the strategy to combat fluctuation of environmental conditions, wearable variable-emittance (WeaVE) devices are able integrate functionality personal thermoregulation and closed-loop control into future textile, featuring its large tunable range, ultra-low energy consumption, lightweight, wearability. Recently, this new technology has evolved beyond planar electrochromic cells is moving closer woven textiles. To further improve performance wearability, comprehensive progress necessary from materials science fabrication techniques. In Perspective, we elaborate on mechanisms behind electrochemically active WeaVE devices, analyze how dynamic fundamental studies may performance, explore possibility incorporating nanophotonic designs in development smart textile through research.

Language: Английский

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