Duan Research Group

Hetero-integrated Nanostructures and Nanodevices


Broadband nonlinear modulation of incoherent light using a transparent optoelectronic neuron array

Dehui Zhang, Dong Xu, Yuhang Li, Yi Luo, Jingtian Hu, Jingxuan Zhou, Yucheng Zhang, Boxuan Zhou, Peiqi Wang, Xurong Li, Bijie Bai, Huaying Ren, Laiyuan Wang, Ao Zhang, Mona Jarrahi, Yu Huang, Aydogan Ozcan & Xiangfeng Duan

Nature communications 15, (2024)

Nonlinear optical processing of ambient natural light is highly desired for computational imaging and sensing. Strong optical nonlinear response under weak broadband incoherent light is essential for this purpose. By merging 2D transparent phototransistors (TPTs) with liquid crystal (LC) modulators, we create an optoelectronic neuron array that allows self-amplitude modulation of spatially incoherent light, achieving a large nonlinear contrast over a broad spectrum at orders-of-magnitude lower intensity than achievable in most optical nonlinear materials. We fabricated a 10,000-pixel array of optoelectronic neurons, and experimentally demonstrated an intelligent imaging system that instantly attenuates intense glares while retaining the weaker-intensity objects captured by a cellphone camera. This intelligent glare-reduction is important for various imaging applications, including autonomous driving, machine vision, and security cameras. The rapid nonlinear processing of incoherent broadband light might also find applications in optical computing, where nonlinear activation functions for ambient light conditions are highly sought.
UCLA, Department of Chemistry and Biochemistry
607 Charles E. Young Drive East, Box 951569
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E-mail: xduan@chem.ucla.edu