Broadband vectorial vortex filtering for edge enhancement based on spin-multiplexing metasurface in terahertz bands

IF 3.4 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2025-09-03 DOI:10.1016/j.infrared.2025.106132

Yongqiang Yang , Menghao Li , Wenbing Zhang , Zongqiang Sheng , Juan Gao , Hongwei Wu

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Abstract

We propose and demonstrate an ultra-compact all-dielectric metasurface that constructs a vectorial vortex filtering system to perform broadband edge enhancement in terahertz (THz) bands. The vectorial point spread functions (PSFs) and their polarization states of the filtering system are calculated and analyzed. By controlling the polarization state of the incident THz wave, all polarization states of the vectorial PSF are achieved on the first-order Poincaré sphere. Numerical simulations show that the vectorial vortex filter can be used for selective edge enhancement when coupled with an analyzer positioned before the output plane. The orientation and anisotropy degree of selective edge enhancement can be flexibly manipulated by the polarization state of incident THz wave and the linear polarization angle of the analyzer. Our study broadens the functionality of vectorial vortex filtering systems, and the ultrathin metasurface design enables integration into optics or THz imaging systems for miniaturization.

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基于太赫兹自旋复用超表面的宽带矢量涡旋滤波边缘增强

我们提出并展示了一种超紧凑的全介电超表面，它构建了一个矢量涡滤波系统来执行太赫兹（THz）波段的宽带边缘增强。对滤波系统的矢量点扩散函数及其偏振态进行了计算和分析。通过控制入射太赫兹波的偏振态，可以在一阶庞卡尔卡尔球上实现矢量PSF的所有偏振态。数值模拟结果表明，当在输出平面前加上一个分析仪时，矢量涡滤波器可以用于选择性边缘增强。选择边缘增强的取向和各向异性程度可以通过入射太赫兹波的偏振状态和分析仪的线偏振角来灵活控制。我们的研究拓宽了矢量涡旋滤波系统的功能，超薄的超表面设计可以集成到光学或太赫兹成像系统中，实现小型化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.