Cheng Bo, Wang Xiaoming, Zou Yuxiao, Song Guofeng, Zhai Kunpeng, Wang Xiaojun
Postdoctoral Innovation Practice Base, Chengdu Polytechnic, 83 Tianyi Street, Chengdu 610041, China.
Sichuan Provincial Engineering Research Center of Thermoelectric Materials and Devices, Chengdu 610041, China.
Micromachines (Basel). 2025 Aug 14;16(8):937. doi: 10.3390/mi16080937.
Polarization-sensitive photodetection is critical for advanced optical systems, yet achieving simultaneous high-fidelity recognition of the circularly polarized (CP) and linearly polarized (LP) light with compact designs remains challenging. Here, we use COMSOL 5.6 software to demonstrate a silicon metasurface-integrated MCT photodetector that resolves both CP and LP signals through a single ultrathin platform. The device deciphers LP states via four orientation-specific linear gratings for differential detection, while chiral symmetric silicon nanostructures enable direct CP discrimination with an exceptional extinction ratio of 30 dB. The proposed architecture combines two breakthroughs: (1) superior polarization reconstruction capability, achieved via the synergy of grating-induced polarization selectivity and chiral near-field enhancement, and (2) a fabrication-simplified process that eliminates multilayer stacking or complex alignment steps. This work establishes a new paradigm for miniaturized, high-performance polarization optics, with potential applications in polarization imaging, quantum communication, and hyperspectral sensing.
偏振敏感光探测对于先进光学系统至关重要，但要通过紧凑设计同时实现对圆偏振（CP）光和线偏振（LP）光的高保真识别仍具有挑战性。在此，我们使用COMSOL 5.6软件展示了一种硅超表面集成的碲镉汞（MCT）光探测器，该探测器可通过单个超薄平台解析CP和LP信号。该器件通过四个特定取向的线性光栅进行差分检测来解密LP状态，而手性对称硅纳米结构能够以30 dB的优异消光比实现直接的CP辨别。所提出的架构结合了两项突破：（1）通过光栅诱导的偏振选择性和手性近场增强的协同作用实现卓越的偏振重建能力，以及（2）简化制造过程，消除了多层堆叠或复杂的对准步骤。这项工作为小型化、高性能偏振光学建立了新范例，在偏振成像、量子通信和高光谱传感中具有潜在应用。
