Dynamically Reconfigurable on-Chip Polarimeters Based on Nanoantenna Enabled Polarization Dependent Optoelectronic Computing
Xu Dai, Yu Yu, Ye Tao, Jie Deng, Yonghao Bu, Mengdie Shi, Ruowen Wang, Jing Zhou, Liaoxin Sun, Xiaoshuang Chen, Xuechu Shen
Abstract
On-chip polarization detectors have attracted extensive research interest due to their filterless and ultracompact architecture. However, their polarization-dependent photoresponses cannot be dynamically adjusted, hindering the development toward intelligence. Here, we propose dynamically reconfigurable polarimetry based on in-sensor differentiation of two self-powered photoresponses with orthogonal polarization dependences and tunable responsivities. Such a device can be electrostatically configured in an ultrahigh polarization extinction ratio (PER) mode, where the PER tends to infinity, a Stokes parameter direct sensing mode, where the photoresponse is proportional to S 1 or S 2 with high accuracy (RMSE S 1 = 1.5%, RMSE S 2 = 2.0%), or a background suppressing mode, where the target-background polarization contrast is singularly enhanced. Moreover, the device achieves a polarization angle sensitivity of 0.51 mA·W –1 ·degree –1 and a specific polarization angle detectivity of 2.8 × 10 5 cm·Hz 1/2 ·W·degree –1 . This scheme is demonstrated throughout the near-to-long-wavelength infrared range, and it will bring a leap for next-generation on-chip polarimeters.