Review on the terahertz metasensor: from featureless refractive index sensing to molecular identification

Photonics Research, Год журнала: 2023, Номер 12(2), С. 194 - 194

Опубликована: Дек. 4, 2023

The terahertz (THz) wave is at the intersection between photonics and electronics in electromagnetic spectrum. Since vibration mode of many biomedical molecules weak interaction inside fall THz regime, utilizing radiation as a signal source to operate substance information sensing has its unique advantages. Recently, metamaterial sensor (metasensor) greatly enhanced substances spectral selectivity on subwavelength scale. However, most past review articles have demonstrated metasensor terms their structures, applications, or materials. Until recently, with rapid development metasensing technologies, molecular paid much more attention platform metasensors. In this review, we comprehensively introduce for detecting not only featureless refractive index but also vibrational/chiral analytes. objectives are improve specificity either by chemical material-assisted analyte capture physical information. Later, boost absorption features certain frequency, resonant responses metasensors can be tuned vibrational modes target molecules, while frequency multiplexing techniques reviewed enhance broadband spectroscopic fingerprints. chiral summarized specific identification molecules. Finally, potential prospects next generation discussed. Compared metasensing, platforms accelerated material modification will lead greater impact advancement trace detection conformational dynamics biomolecules practical applications.

Язык: Английский

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Ultra-wideband terahertz fingerprint enhancement sensing and inversion model supported by single-pixel reconfigurable graphene metasurface

PhotoniX, Год журнала: 2024, Номер 5(1)

Опубликована: Апрель 15, 2024

Abstract The molecular fingerprint sensing technology based on metasurface has unique attraction in the biomedical field. However, terahertz (THz) band, existing designs multi-pixel or angle multiplexing usually require more analyte amount possess a narrower tuning bandwidth. Here, we propose novel single-pixel graphene metasurface. Based synchronous voltage tuning, this enables ultra-wideband ( $$\sim$$ ∼ 1.5 THz) enhancement of trace analytes, including chiral optical isomers, with limit detection (LoD) ≤ 0.64 μg/mm 2 . signal 17.4 dB) originates from electromagnetically induced transparency (EIT) effect excited by metasurface, and ideal overlap between light field constrained single-layer (SLG) ultra-thin analyte. Meanwhile, due to nonlinear mechanism absorption envelope distortion is inevitable. To solve problem, universal spectrum inversion model developed for first time, restoration standard fingerprints reaches R max ≥ 0.99. In addition, asynchronous provides an opportunity realizing dynamic reconfiguration EIT resonance slow modulation broadband range. This work builds bridge THz potential applications active spatial modulators, devices imaging equipments.

Язык: Английский

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Dual-band terahertz reflective-mode metasurface for the wavefront manipulation of independent linear and circular polarization waves

Journal of the Optical Society of America B, Год журнала: 2023, Номер 41(2), С. 341 - 341

Опубликована: Дек. 15, 2023

Metasurfaces (MSs) are being extensively researched owing to their ability modulate the polarization and wavefront of electromagnetic (EM) waves in a flexible manner, which usually offer significant advantages including ultra-thinness, low losses, easy fabrication. However, conventional MSs typically operate well only with single polarization. Here, we propose novel design strategy for terahertz (THz) reflective-mode MS that relies on unit-cell arrangement combining propagation phase geometric phase. Our designed can achieve multiple manipulations reflection mode, not limited circular (CP) transformation, but also enabling linear (LP) conversion. The consists periodic array bilayered metal patterned resonator structures sandwiched by dielectric substrate. metallic is made outer single-split-ring (SSR) C-shaped slot (CSS), inner double-split-ring (DSR), its complementary structure. With this design, capable converting LP wave orthogonal counterpart at lower frequency ( f 1 =0.7THz) after reflection. Additionally, higher 2 =1.4THz), proposed convert right-handed CP (RCP) left-handed (LCP) upon or vice versa. π full coverage be achieved independently simultaneously adjusting opening orientation angles SSR based phase, angle DSR We numerically demonstrate beam deflection, planar focusing, vortex both reflected three representative provide proof concept. These findings reveal great potential multifunctional devices dual-polarization imaging communication systems.

Язык: Английский

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Metalens in Improving Imaging Quality: Advancements, Challenges, and Prospects for Future Display

Laser & Photonics Review, Год журнала: 2024, Номер 18(4)

Опубликована: Янв. 25, 2024

Abstract Metalens, a metasurface with focusing phase, has been the focus of research due to its immense potential for use in imaging and display technology. Traditional lens optical systems rely on phase accumulation, however metalens subwavelength structures provide disruptive path miniaturized by allowing unfettered modulation incident light's amplitude. Recently, extensive efforts have devoted exploring new design strategies, functionalities, possible applications. This paper reviews development, principle, classification, status metalens. In particular, this review focuses progress challenges improving quality expanding diversity, including improvements resolution, enhancement depth field, extension field view, achromatism. Lastly, prospects future are summarized, application potentials novel 3D display, intelligent bionic as well nano‐pixelate light‐emitting (NLED) emphasized.

Язык: Английский

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Terahertz Lattice enhanced Quasi-Anapole Immunosensor assisted by protein antibody and AuNPs

Sensors and Actuators B Chemical, Год журнала: 2024, Номер 410, С. 135628 - 135628

Опубликована: Март 9, 2024

Язык: Английский

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Color coded metadevices toward programmed terahertz switching

Light Science & Applications, Год журнала: 2024, Номер 13(1)

Опубликована: Июнь 25, 2024

Abstract Terahertz modulators play a critical role in high-speed wireless communication, non-destructive imaging, and so on, which have attracted large amount of research interest. Nevertheless, all-optical terahertz modulation, an ultrafast dynamical control approach, remains to be limited terms encoding multifunction. Here we experimentally demonstrated optical-programmed switching realized by combining optical metasurfaces with the metasurface, resulting 2-bit dual-channel encoding. The made up semiconductor islands artificial microstructures, enables effective programming providing multiple frequency channels modulation at nanosecond level. Meanwhile, covered metasurface alter spatial light field distribution obtain color code. According time-domain coupled mode theory analysis, energy dissipation modes can independently controlled excitation, explains principle well. This work establishes platform for programmed metadevices may further advance application composite manipulation.

Язык: Английский

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Identification of Panax notoginseng origin using terahertz precision spectroscopy and neural network algorithm

Talanta, Год журнала: 2024, Номер 274, С. 125968 - 125968

Опубликована: Март 31, 2024

Язык: Английский

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Metasurface polarization optics: From classical to quantum

Applied Physics Reviews, Год журнала: 2024, Номер 11(4)

Опубликована: Дек. 1, 2024

Metasurface polarization optics, manipulating using metasurfaces composed of subwavelength anisotropic nanostructure array, has enabled a lot innovative integrated strategies for versatile and on-demand generation, modulation, detection. Compared with conventional bulky optical elements control, metasurface optics provides feasible platform in scale to build ultra-compact multifunctional devices, greatly shrinking the size whole polarized system network. Here, we review recent progresses both classical quantum regimes, including uniform spatially varying polarization-manipulating devices. Basic such as meta-waveplate, meta-polarizer, resonant meta-devices singularities provide compact means generate modulate beams. Spatial-varying manipulation by employing pixelation feature metasurfaces, leading advanced diffraction imaging functionalities, vectorial holography, classic imaging, entanglement, interference, modulation. Substituting approaches pave way on-chip or information processing, flourishing applications displaying, communication, computing.

Язык: Английский

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Inverse Design of Photonic Surfaces via High throughput Femtosecond Laser Processing and Tandem Neural Networks

Advanced Science, Год журнала: 2024, Номер 11(26)

Опубликована: Апрель 29, 2024

Abstract This work demonstrates a method to design photonic surfaces by combining femtosecond laser processing with the inverse capabilities of tandem neural networks that directly link fabrication parameters their resulting textured substrate optical properties. High throughput and characterization platforms are developed generate dataset comprising 35280 unique microtextured on stainless steel corresponding measured spectral emissivities. The trained model utilizes nonlinear one‐to‐many mapping between emissivity parameters. Consequently, it generates predominantly novel designs, which reproduce full range emissivities (average root‐mean‐squared‐error < 2.5%) using only compact region parameter space 25 times smaller than what is represented in training data. Finally, experimentally validated thermophotovoltaic emitter application. By synergizing laser‐matter interactions network capabilities, approach offers insights into accelerating discovery surfaces, advancing energy harvesting technologies.

Язык: Английский

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Photoactive Polymer‐Silicon Heterostructures for Terahertz Spatial Light Modulation and Video‐Rate Single‐Pixel Compressive Imaging

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Abstract Terahertz (THz) waves, known for their low photon energy and unique spectral fingerprints, have broad applications in non‐destructive testing, biomedicine, other fields. However, traditional THz imaging techniques are constrained by long wavelength slow speeds due to raster scanning. Single‐pixel offers a high‐throughput, high‐resolution alternative, yet the performance of spatial light modulators (SLMs) remains limited trade‐off between modulation depth rate. Here, polymer‐silicon heterostructure is proposed as SLM using continuous‐wave (CW) optical illumination. The organic‐semiconductor interface promotes photo‐generated carrier accumulation, while thickness silicon substrate influences whole effective lifetime. design enables with both high fast rate, ideal single‐pixel imaging. A video‐rate super‐resolution demonstrated CW source. dependence quality on pump power switch rate digital micromirror devices investigated, which demonstrates that speed contrast not lifetime silicon, rather than hardware devices. In addition, water content micro‐fluidic chip tracked, highlighting potential bioanalysis biomedical applications.

Язык: Английский

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