可调谐太赫兹全介质线性到圆极化转换超表面

IF 0.7 4区 物理与天体物理 Q4 OPTICS Optica Applicata Pub Date : 2022-01-01 DOI:10.37190/oa220406
Xiacao Ju, Weiguang Wang, Bingchao Liu, Yanzhao Hou, Huashun Wen, Daquan Yang
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引用次数: 1

摘要

太赫兹(THz)线性到圆(LTC)偏振转换在成像和6G无线通信中起着至关重要的作用。本文介绍了一种利用有源全介电超表面的热可调谐太赫兹LTC偏振变换器。它由氧化锆(ZrO2)微球谐振器、活性钛酸锶(STO)包层和柔性聚酰亚胺衬底组成。通过数值模拟,该偏振变换器在0.265 THz处的椭圆度幅值为-1,表明其实现了完美的右圆极化(RHCP)波。同时,在0.247 ~ 0.278 THz(相对带宽为12%)范围内,椭圆度幅值小于-0.8。另外,在180 K的温度变化(从200到380 K)下,变换器的工作频率可以在0.220到0.291太赫兹之间调谐,灵敏度约为39 GHz/100 K。此外,在0.220 THz下,椭圆度振幅的调制深度可达92%,表明该变换器可以输出不同偏振态的太赫兹波,并且该器件可以大规模制造。这些良好的转换性能表明该转换器在高速通信和成像领域具有潜在的应用前景。
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Tunable terahertz all-dielectric linear-to-circular polarization conversion metasurface
Terahertz (THz) linear-to-circular (LTC) polarization conversion plays a crucial role in imaging and 6G wireless communication. This paper will give an account of a thermally tunable THz LTC polarization converter by using the active all-dielectric metasurface. It consists of zirconium oxide (ZrO2) microsphere resonators, active strontium titanate (STO) cladding, and flexible polyimide substrate. Through numerical simulation, the amplitude of the ellipticity of the proposed polarization converter at 0.265 THz is –1, indicating that perfect right-hand circular polarization (RHCP) wave is achieved. Meanwhile, the amplitude of the ellipticity is less than –0.8 between 0.247 and 0.278 THz (relative bandwidth is 12%). In addition, with the temperature changes of 180 K (from 200 to 380 K), the operating frequency of the converter can be tuned from 0.220 to 0.291 THz, a sensitivity about 39 GHz/100 K is achieved. Besides, the modulation depth of the ellipticity amplitude can achieve 92% at 0.220 THz, which demonstrates that the converter can output terahertz wave with different polarization states, and the device can be fabricated on a large scale. These perfect conversion performances show that the converter has potential applications in high-speed communication and imaging.
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来源期刊
Optica Applicata
Optica Applicata 物理-光学
CiteScore
1.00
自引率
16.70%
发文量
21
审稿时长
4 months
期刊介绍: Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.
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