Electrically tunable optical metasurfaces

Photonics Insights, Год журнала: 2024, Номер 3(3), С. R07 - R07

Опубликована: Янв. 1, 2024

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Environmental permittivity-asymmetric BIC metasurfaces with electrical reconfigurability

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Авг. 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.

Язык: Английский

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Organic Metasurfaces with Contrasting Conducting Polymers

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Янв. 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

Язык: Английский

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High-Q Emission from Colloidal Quantum Dots Embedded in Polymer Quasi-BIC Metasurfaces

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Янв. 18, 2025

Metasurfaces supporting narrowband resonances are of significant interest in photonics for molecular sensing, quantum light source engineering, and nonlinear photonics. However, many device architectures rely on large refractive index dielectric materials lengthy fabrication processes. In this work, we demonstrate quasi-bound states the continuum (quasi-BICs) using a polymer metasurface exhibiting experimental quality factors 305 at visible wavelengths. Our process only consists electron-beam lithography resist development, making it compatible with large-scale techniques. Additionally, address challenges integrating colloidal dots (CQDs) into nanopillars, such as depletion-induced aggregation excess nanoparticle removal, by leveraging our previously reported functionalization method modified development procedures. We both polarized emission from CQD-integrated quasi-BIC metasurfaces. proposed platform is broadly applicable across various emitters methods could enable advancements scalable manufacturing resonant optical devices.

Язык: Английский

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Switchable Broadband Terahertz Absorbers Based on Conducting Polymer‐Cellulose Aerogels

Advanced Science, Год журнала: 2023, Номер 11(3)

Опубликована: Ноя. 23, 2023

Abstract Terahertz (THz) technologies provide opportunities ranging from calibration targets for satellites and telescopes to communication devices biomedical imaging systems. A main component will be broadband THz absorbers with switchability. However, optically switchable materials in are scarce their modulation is mostly available at narrow bandwidths. Realizing large absorption or transmission forms a critical challenge. This study demonstrates that conducting polymer‐cellulose aerogels can of light range ≈ 13% 91% absolute transmission, while maintaining specular reflection loss < −30 dB. The exceptional associated the anomalous optical conductivity peak polymers, which enhances its oxidized state. also possibility reduce surface hydrophilicity by simple chemical modifications, shows frequencies enables de‐frosting solar‐induced heating. These low‐cost, aqueous solution‐processable, sustainable, bio‐friendly may find use next‐generation intelligent devices.

Язык: Английский

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Programmable directional color dynamics using plasmonics

Microsystems & Nanoengineering, Год журнала: 2024, Номер 10(1)

Опубликована: Фев. 1, 2024

Abstract Adaptive multicolor filters have emerged as key components for ensuring color accuracy and resolution in outdoor visual devices. However, the current state of this technology is still its infancy largely reliant on liquid crystal devices that require high voltage bulky structural designs. Here, we present a nanofilter consisting multilayered ‘active’ plasmonic nanocomposites, wherein metallic nanoparticles are embedded within conductive polymer nanofilm. These nanocomposites fabricated with total thickness below 100 nm using ‘lithography-free’ method at wafer level, they inherently exhibit three prominent optical modes, accompanying scattering phenomena produce distinct dichroic reflection transmission colors. pivotal achievement all these colors electrically manipulated an applied external less than 1 V 3.5 s switching speed, encompassing entire visible spectrum. Furthermore, programmable function enables effective dynamic modulation temperature white light across warm-to-cool spectrum (3250 K–6250 K). This transformative capability exceptionally valuable enhancing performance independent factors such sun’s elevation prevailing weather conditions.

Язык: Английский

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Electrically tunable infrared optics enabled by flexible ion-permeable conducting polymer-cellulose paper

npj Flexible Electronics, Год журнала: 2024, Номер 8(1)

Опубликована: Сен. 5, 2024

Язык: Английский

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Topologically Engineered Strain Redistribution in Elastomeric Substrates for Dually Tunable Anisotropic Plasmomechanical Responses

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(5), С. 6337 - 6347

Опубликована: Янв. 29, 2024

The prompt visual response is considered to be a highly intuitive tenet among sensors. Therefore, plasmomechanical strain sensors, which exhibit dynamic structural color changes, have recently been developed by using mechanical stimulus-based elastomeric substrates for wearable However, the reported sensors either lack directional sensitivity or require complex signal processing and device design strategies ensure anisotropic optical responses. To best of our knowledge, there no reports on utilizing obtain Herein, we propose an sensor distinguish between applied force direction magnitude. We employ simple strain-engineered topological elastomer mechanically transform closely packed metallic nanoparticles (NPs) into rearrangements depending direction. proposed structure consists heterogeneous-modulus that exhibits direction-dependent Poisson effect owing periodically line-patterned local redistribution occurring due same magnitude external force. Consequently, reorientation self-assembled gold (Au)-NP array manifests dual anisotropy, i.e., force- polarization-direction-dependent plasmonic coupling. cost-effectiveness platform pave way numerous applications based transformation inhomogeneities.

Язык: Английский

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Organic Exciton Polariton Structured Illumination Microscopy

ACS Photonics, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

Resonantly excited surface plasmon polaritons at the metal–dielectric interface have revolutionized optical applications, including bioimaging, chemical sensing, and miniaturized photonic devices. However, their use is limited by challenges, such as tunability, constraints in strong field confinement, losses, wavelength restrictions. Organic excitonic materials emerged promising candidates for addressing these issues. In this study, we demonstrate that organic films can support exciton visible frequencies, highlighting potential established imaging techniques. This provides a alternative to metal-based plasmonic structured illumination microscopy with numerous advantages. Exciton polariton (ESIM) proposed fluorescence technique, achieving 5-fold resolution improvement over conventional epi-fluorescence microscopy. These results may pave way realizing super-resolution bioimaging simple straightforward manner.

Язык: Английский

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Femtosecond Direct Laser Writing of Conductive and Electrically Switchable PEDOT:PSS Optical Nanostructures

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract Microscale three‐dimensional (3D)‐printing, with its remarkable precision and ability to create complex structures, has transformed a wide range of applications, from micro‐optics photonics endoscopy quantum technologies. In these fields, miniaturization plays crucial role in unlocking new capabilities. However, despite advancements, most 3D‐printed optical structures have remained static, lacking dynamic behavior tunability. this study, novel approach is presented that combines direct laser writing the electrically switchable properties conductive polymer poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). This integration facilitates creation directly on objects, marking significant step toward adaptive devices. The fabrication tunable demonstrated via using PEDOT:PSS indium tin oxide (ITO)‐coated glass substrates, as well beneath atop static structures. It found electrical conductivity greyscale remains intact after writing. switching speed, durability, gradual tunability material are explored upon complementary metal‐oxide‐semiconductor (CMOS)‐compatible voltages ranging −3 +2 V. future, advancement opens exciting possibilities micro‐optics, such apertures printed onto micro‐optical lenses.

Язык: Английский

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