Lv Tingting, Cui Enhui, Wang Yetong, Xia Dexin, Han Jian, Liu Qiang, Shi Jinhui
Opt Lett. 2025 Aug 1;50(15):4770-4773. doi: 10.1364/OL.565087.
We present a switchable broadband terahertz multifunctional wave plate with VO-metal hybrid Huygens' metasurface, which enables the switching between a quarter-wave plate and a half-wave plate. In the insulating phase of the VO film, the hybrid Huygens' metasurface acts as a broadband reversible quarter-wave plate, capable of reverting normally incident linearly polarized light into circularly polarized light and vice versa. The maximum efficiencies of transmitted circular and linear polarizations are 90.97% and 91.03%, respectively, within the frequency range of 0.81-1.26 THz. The hybrid Huygens' metasurface functions as a half-wave plate when VO is in its metallic phase, exhibiting a bandwidth of 0.9 THz. Furthermore, typical parameters that determine the polarization properties are analyzed to examine their accuracy in describing circularly polarized light. The proposed broadband terahertz multifunctional wave plate exhibits full-space tunability, high efficiency, and broad bandwidth, showing great potential to advance the development of broadband polarization converters and compact optical systems.
我们展示了一种具有VO-金属混合惠更斯超表面的可切换宽带太赫兹多功能波片，它能够在四分之一波片和半波片之间切换。在VO薄膜的绝缘相中，混合惠更斯超表面充当宽带可逆四分之一波片，能够将正常入射的线偏振光转换为圆偏振光，反之亦然。在0.81-1.26太赫兹的频率范围内，透射圆偏振和线偏振的最大效率分别为90.97%和91.03%。当VO处于金属相时，混合惠更斯超表面充当半波片，带宽为0.9太赫兹。此外，分析了决定偏振特性的典型参数，以检验它们在描述圆偏振光方面的准确性。所提出的宽带太赫兹多功能波片具有全空间可调性、高效率和宽带宽，在推动宽带偏振转换器和紧凑型光学系统的发展方面显示出巨大潜力。
