Yang Qi, Hu Jie, Li Haozhou, Du Qing, Feng Shuanglong, Yang Dong, Zhang Yupeng, Shen Jun
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, P. R. China.
College of Electronics and Information Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
Adv Sci (Weinh). 2025 Mar;12(11):e2413662. doi: 10.1002/advs.202413662. Epub 2025 Jan 22.
In this manuscript, an all-optical modulation photodetector based on a CdS/graphene/Ge sandwich structure is designed. In the presence of the modulation (near-infrared) light, the Fermi level of the graphene channel shifts, allowing for the tuning of the visible light response speed as well as achieving a broad responsivity range from negative (-3376 A/W) to positive (3584 A/W) response. Based on this, logical operations are performed by adjusting the power of the modulation light superimposed with the signal light. This facilitates more covert, all-optical, high-speed encrypted communication. The ultrahigh tunability and nearly symmetric positive and negative photoconductivity of all-optical modulation photodetectors significantly enhance the computational capacity of neuromorphic hardware. The proposed device exhibits substantial advantages in applications requiring high fault tolerance for integrated sensing-computing （ISC） and high-resolution motion object recognition, providing insights for the development of next-generation high-bandwidth, low-power-consumption ISC devices.
在本论文中，设计了一种基于硫化镉/石墨烯/锗三明治结构的全光调制光电探测器。在调制（近红外）光存在的情况下，石墨烯通道的费米能级发生移动，从而可以调节可见光响应速度，并实现从负响应（-3376 A/W）到正响应（3584 A/W）的宽响应度范围。基于此，通过调整与信号光叠加的调制光功率来执行逻辑运算。这有助于实现更隐蔽的全光高速加密通信。全光调制光电探测器的超高可调性以及近乎对称的正负光电导性显著提高了神经形态硬件的计算能力。所提出的器件在需要对集成传感计算（ISC）具有高容错性和高分辨率运动物体识别的应用中展现出显著优势，为下一代高带宽、低功耗ISC器件的发展提供了思路。
