• Chinese Optics Letters
  • Vol. 19, Issue 9, 093701 (2021)
Shitong Xu1、*, Fei Fan2, Hongzhong Cao1, Yinghua Wang1, and Shengjiang Chang2、3
Author Affiliations
  • 1Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, School of Physics and Engineering, Qufu Normal University, Qufu 273165, China
  • 2Institute of Modern Optics, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China
  • 3Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, China
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    Abstract

    We experimentally investigate the linear polarization conversion for terahertz (THz) waves in liquid crystal (LC) integrated metamaterials, which consist of an LC layer sandwiched by two orthogonally arranged sub-wavelength metal gratings. A Fabry–Perot-like cavity is well constructed by the front and rear gratings, and it shows a strong local resonance mechanism, which greatly enhances the polarization conversion efficiency. Most importantly, the Fabry–Perot-like resonance can be actively tuned by modulating the refractive index of the middle LC layer under the external field. As a result, the integrated metamaterial achieves multi-band tunable linear polarization conversion.
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    Shitong Xu, Fei Fan, Hongzhong Cao, Yinghua Wang, Shengjiang Chang. Liquid crystal integrated metamaterial for multi-band terahertz linear polarization conversion[J]. Chinese Optics Letters, 2021, 19(9): 093701
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    Category: Infrared and Terahertz Photonics
    Received: Jan. 26, 2021
    Accepted: Mar. 3, 2021
    Posted: Mar. 4, 2021
    Published Online: Jun. 15, 2021
    The Author Email: Shitong Xu (xustonenk@163.com)