Scholarlink

<p>The polarization rotator (PR) is an optical device designed to rotate the polarization of light from one orientation to another, enabling efficient polarization control in integrated photonic circuits. Terahertz (THz) technology requires precise polarization control for high-speed communication and sensing, yet achieving high extinction ratios in compact footprints remains a significant challenge. To address this, a THz-PR based on L-shaped waveguide is designed and numerically analyzed. The proposed PR structure consists of a polyethylene substrate and cladding material, while the core region is made of gallium arsenide (GaAs) material. The modal and propagation characteristics of the presented PR are evaluated by the full vectorial finite-difference method (FVFDM) and mode matching technique, respectively. The geometrical parameters are studied to attain a compact design with minimum crosstalk (CT) where the propagation analysis is performed through the mode matching technique. At an operating frequency of 1.0&#xa0;THz, the device achieves a high conversion ratio of 99% over a conversion length of about 7.7&#xa0;mm with low CT = −&#xa0;22.83&#xa0;dB. Additionally, the designed waveguide structure shows robust fabrication tolerance, confirming the design’s practical applicability within the THz spectrum. The large conversion efficiency effectively solves the common trade-off between device footprint and signal quality. Therefore, the presented PR serves as a reliable building block for the THz polarization handling devices and systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Efficient terahertz polarization rotator using L-Shaped waveguide

  • 期刊论文

  • 发表日期：

    2026年5月3日

查看全文
  • Nagat A. Elmahdy,
  • Mohamed Farhat O. Hameed,
  • S. S. A. Obayya,
  • B. M. Younis

摘要

The polarization rotator (PR) is an optical device designed to rotate the polarization of light from one orientation to another, enabling efficient polarization control in integrated photonic circuits. Terahertz (THz) technology requires precise polarization control for high-speed communication and sensing, yet achieving high extinction ratios in compact footprints remains a significant challenge. To address this, a THz-PR based on L-shaped waveguide is designed and numerically analyzed. The proposed PR structure consists of a polyethylene substrate and cladding material, while the core region is made of gallium arsenide (GaAs) material. The modal and propagation characteristics of the presented PR are evaluated by the full vectorial finite-difference method (FVFDM) and mode matching technique, respectively. The geometrical parameters are studied to attain a compact design with minimum crosstalk (CT) where the propagation analysis is performed through the mode matching technique. At an operating frequency of 1.0 THz, the device achieves a high conversion ratio of 99% over a conversion length of about 7.7 mm with low CT = − 22.83 dB. Additionally, the designed waveguide structure shows robust fabrication tolerance, confirming the design’s practical applicability within the THz spectrum. The large conversion efficiency effectively solves the common trade-off between device footprint and signal quality. Therefore, the presented PR serves as a reliable building block for the THz polarization handling devices and systems.