Chiba Kohei, Okatani Taiyu, Inomata Naoki, Kanamori Yoshiaki
Opt Express. 2023 Aug 14;31(17):27147-27160. doi: 10.1364/OE.492942.
We designed and fabricated beam steering subwavelength grating (BS-SWG) with high efficiency, wide angles, and broadband beam steering in the terahertz (THz) range. Beam steering technology in the THz range by a fixed structure and frequency sweep has to date lacked a device combining high efficiency and a wide beam steering angle. A subwavelength structure using float zone Si, a low-loss dielectric, could combine both of these aspects, but no experimental demonstration in the THz range has been performed to our knowledge. The BS-SWG was designed with an efficiency of 0.708 at 0.4 THz and beam steering angles of -72.1°--34.8° by sweeping the incident frequency from 0.3 THz to 0.5 THz including the Beyond 5 G/6 G communication bands. An efficiency of 0.354 at 0.400 THz and beam steering angles of -74°--34° were experimentally achieved, demonstrating the potential of high-efficiency, wide-angle beam steering for THz communications, imaging, and radar applications.
我们设计并制造了用于太赫兹（THz）波段的具有高效率、宽角度和宽带波束转向功能的波束转向亚波长光栅（BS-SWG）。迄今为止，通过固定结构和频率扫描实现太赫兹波段的波束转向技术一直缺乏一种兼具高效率和宽波束转向角的器件。使用低损耗电介质浮区硅的亚波长结构可以兼顾这两个方面，但据我们所知，尚未在太赫兹波段进行过实验验证。该BS-SWG的设计在0.4太赫兹时效率为0.708，通过将入射频率从0.3太赫兹扫描到0.5太赫兹（包括超5G/6G通信频段），波束转向角为-72.1°至-34.8°。实验实现了在0.400太赫兹时效率为0.354，波束转向角为-74°至-34°，证明了其在太赫兹通信、成像和雷达应用中实现高效率、宽角度波束转向的潜力。
