Magnetic‐Driven Broadband Epsilon‐Near‐Zero Materials at Radio Frequency

Advanced Functional Materials, Год журнала: 2023, Номер 34(2)

Опубликована: Сен. 28, 2023

Abstract Epsilon‐near‐zero (ENZ) materials, exhibiting unique physical characteristics such as near‐zero refraction, have aroused extensive interest and exhibit great potentials in novel applications of perfect absorbers, high‐harmonic generation, nonlinear optical response. Here, for the first time, magnetic‐driven broadband ENZ materials are designed by fabricating polyvinyl alcohol (PVA)/Ni@carbon nanotubes (CNTs) films. Dielectric properties including real permittivity ( ɛ ′), imaginary ″), dielectric loss (tan δ ), impedance Z ) investigated. When Ni@CNTs content reached 30 wt.%, negative transferred to positive at ≈11.5 MHz, epsilon‐near‐zero (| ′| < 1) is realized from ≈9 14 broad bandwidth ≈5 MHz. Theory calculations confirm that delocalized electrons introduced CNTs, which improve carrier mobility achieve low frequency dispersion behavior. Longer interfacial polarization electric fields between PVA CNTs also demonstrated theory calculations, enhancing response offset Ni@CNTs. These two mechanisms result radio frequency. This film exhibits excellent magnetic actuation ability under field, broadening magnetically actuated robots with absorption, biomimetic aircrafts shielding ability, photodetectors, etc.

Язык: Английский

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Synthesized complex-frequency excitation for ultrasensitive molecular sensing

eLight, Год журнала: 2024, Номер 4(1)

Опубликована: Янв. 5, 2024

Abstract Sensors have emerged as indispensable analytical tools across a wide range of important fields, encompassing environmental monitoring, food safety, and public health. They facilitate early disease diagnosis, personalized medicine, rapid detection toxic agents. However, detecting trace molecules remains significant challenge. Surface-enhanced infrared absorption (SEIRA) based on plasmonic nanostructures, particularly graphene, has promising approach to enhance sensing sensitivity. While graphene-based SEIRA offers advantages such high sensitivity active tunability, intrinsic molecular damping weakens the interaction between vibrational modes plasmons. Here, we demonstrate ultrahigh-sensitive synthesized complex-frequency waves (CFW). Our experiment shows that CFW can amplify signals (silk protein monolayer) detected by sensor at least an order magnitude be universally applied in different phases. is highly scalable investigation light-matter interactions, enabling diverse potential applications fields optical spectroscopy, biomedicine pharmaceutics.

Язык: Английский

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Cascaded metasurfaces enabling adaptive aberration corrections for focus scanning

Opto-Electronic Advances, Год журнала: 2024, Номер 0(0), С. 240085 - 240085

Опубликована: Янв. 1, 2024

Язык: Английский

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Terahertz nanoscopy: Advances, challenges, and the road ahead

Applied Physics Reviews, Год журнала: 2024, Номер 11(2)

Опубликована: Апрель 10, 2024

Exploring nanoscale material properties through light-matter interactions is essential to unveil new phenomena and manipulate materials at the atomic level, paving way for ground-breaking advancements in nanotechnology science. Various elementary excitations low-energy modes of reside terahertz (THz) range electromagnetic spectrum (0.1–10 THz) occur over various spatial temporal scales. However, due diffraction limit, a slew THz studies are restricted drawing conclusions from spatially varying responses around half probing wavelengths, i.e., tens couple hundred micrometers. To address this fundamental challenge, scanning near-field optical microscopy (SNOM), notably scattering-type SNOM (s-SNOM), combined with sources has been employed fueling growing interest technique across multiple disciplines. This review (1) provides an overview system developments SNOM, (2) evaluates current approaches understand quantify interactions, (3) explores advances applications, especially nano-scale employing s-SNOM, (4) envisions future challenges potential development avenues practical use s-SNOM.

Язык: Английский

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Compensating losses in polariton propagation with synthesized complex frequency excitation

Nature Materials, Год журнала: 2024, Номер 23(4), С. 506 - 511

Опубликована: Янв. 8, 2024

Язык: Английский

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Efficient excitation and control of integrated photonic circuits with virtual critical coupling

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

Опубликована: Март 28, 2024

Abstract Critical coupling in integrated photonic devices enables the efficient transfer of energy from a waveguide to resonator, key operation for many applications. This condition is achieved when resonator loss rate equal bus waveguide. Carefully matching these quantities challenging practice, due variations properties resulting fabrication and external conditions. Here, we demonstrate that non-critically coupled can be by tailoring excitation signal time. We rely on excitations oscillating at complex frequencies load an otherwise overcoupled demonstrating virtual critical if imaginary part frequency equals mismatch between rate. probe microring with tailored pulses observe minimum intensity transmission $$T=0.11$$ T = 0.11 contrast continuous-wave $$T=0.58$$ 0.58 , corresponding 8 times enhancement intracavity intensity. Our technique opens opportunities enhancing controlling on-demand light-matter interactions linear nonlinear platforms.

Язык: Английский

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Gain–loss coupled systems

Deleted Journal, Год журнала: 2025, Номер 2(1)

Опубликована: Фев. 18, 2025

Achieving oscillations with small dimensions, high power, coherence, and low phase noise has been a long-standing goal in wave physics, driving innovations across classical electromagnetic theory quantum physics. Key applications include electronic oscillators, lasers, spin-torque oscillations. In recent decades, physicists have increasingly focused on harnessing passive oscillatory modes to manipulate these oscillations, leading the development of diverse gain–loss coupled systems, including photon–photon, exciton–photon, photon–magnon, magnon–phonon, magnon–magnon couplings. This review provides comprehensive overview exploring their fundamental physical structures, key experimental observations, theoretical insights. By synthesizing insights from studies, we propose future research directions further advance understanding application systems for science technologies.

Язык: Английский

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Natural van der Waals Canalization Lens for Non‐Destructive Nanoelectronic Circuit Imaging and Inspection

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 7, 2025

Abstract Optical inspection has long served as a cornerstone non‐destructive method in semiconductor wafer manufacturing, particularly for surface and defect analysis. However, conventional techniques such dark‐field scattering optics or atomic force microscopy (AFM) face significant limitations, including insufficient resolution the inability to resolve subsurface features. Here, an approach is proposed that integrates strengths of AFM by leveraging van der Waals (vdW) canalization lens based on natural biaxial α‐MoO 3 crystals. This enables ultrahigh‐resolution subwavelength imaging with ability visualize both buried structures, achieving spatial 15 nm grating pitch detection down 100 nm. The underlying mechanism relies unique anisotropic properties , where its atomic‐scale unit cells symmetry facilitate diffraction‐free propagation evanescent propagating waves via flat‐band regime. Unlike metamaterial‐based superlenses hyperlenses, which suffer from high plasmonic losses, fabrication imperfections, uniaxial constraints, provides robust super‐resolution multiple directions. successfully applied achieve high‐resolution nanoscale electronic circuits, offering unprecedented capabilities essential next‐generation manufacturing.

Язык: Английский

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Loss Compensation and Superresolution in Metamaterials with Excitations at Complex Frequencies

Physical Review X, Год журнала: 2023, Номер 13(4)

Опубликована: Ноя. 3, 2023

Metamaterials, from optics to radio frequencies and acoustics, have attracted significant attention over the last few decades, with promising applications in a wide range of technological areas. However, it has been recognized that their performance is often hindered by ubiquitous material loss nonlocal phenomena. A canonical problem consists imaging through metamaterial superlenses, which hold promise superresolution but are, practice, limited as we attempt image deeply subwavelength details. Active metamaterials explored compensate for loss; however, gain introduces other obstacles, e.g., instabilities, nonlinearity, noise. Here, demonstrate temporal excitation passive using signals oscillating at complex can effectively loss, leading resolution enhancement when applied superlenses. More broadly, our results virtual stemming tailored forms tackle impact metamaterials, opening avenues broad acoustic photonic technologies.Received 26 February 2023Revised 21 August 2023Accepted 31 2023DOI:https://doi.org/10.1103/PhysRevX.13.041024Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasAcousticsMetamaterialsPhysical SystemsNon-Hermitian systemsAtomic, Molecular & OpticalCondensed Matter, Materials Applied PhysicsInterdisciplinary Physics

Язык: Английский

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Field‐Driven Inverse Design of High‐Performance Polarization‐Multiplexed Meta‐devices

Laser & Photonics Review, Год журнала: 2024, Номер 18(8)

Опубликована: Март 20, 2024

Abstract During the past few years, metasurface polarization optics has experienced remarkable advances, resulting in revolutionary applications imaging, sensing, computing, etc. The realization of complex optical operations requires consideration both individual meta‐atoms as well their intricate couplings. However, conventional design methods face challenges degrees freedom and functionality complexity. Additionally, previous studies are restricted to local single based on explicit mapping relationships while ignoring interactions, an inability meet on‐demand requirements light‐field operations. Here, a global strategy field‐driven polygon evolution achieve inverse large‐scale coupled is proposed. Through two simulations, it can effectively reshape any given target field into optimal structural distribution devices without knowing relationship. Near‐perfect spin‐decoupled beam‐splitting high‐performance focusing, generation arbitrary vector fields Poincaré sphere with maximal diffraction efficiency closely approaching 100%, experimentally demonstrated. This opens up new avenue for rapid large‐scale, multifunctional meta‐devices, which hold significant implications classical quantum information processing domains.

Язык: Английский

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