Wavelength‐Programmable Parallel Bidirectional Photoresponse for In‐Sensor Information Processing and Fourier Image Encryption

ABSTRACT In‐sensor information processing and image encryption transmission are critical for next‐generation optoelectronic devices with low data latency and robust information security. However, unidirectional photoresponse and complex architectures hinder the integration of optical information processing and image encryption transmission. Here, we design a two‐terminal photodetector based on a Te/MoS 2 /WSe 2 heterojunction, exhibiting excellent broadband self‐powered photodetection with the responsivity, shot‐noise‐limited specific detectivity, and external quantum efficiency of 310.3 mA/W, 3.79 × 10 12 Jones, and 94.9%, respectively. Moreover, it can achieve the wavelength‐programmable parallel bidirectional photoresponse, enabling reconfigurable optoelectronic logic gates (NOR, NAND, NOT and XNOR) in a single device. Furthermore, the XNOR logic operation is applied to edge extraction and moving target recognition. In addition, a ternary Fourier image encryption transmission system is presented, which achieves reconstruction of recognizable structural features in a complex image with a structural similarity index (SSIM) of 0.680. This work provides an effective route to develop optoelectronic devices integrating in‐sensor information processing and image encryption transmission.