New progress in the broadband ultrafast nonlinear activator for optical computing

Update time: 2022-06-21

Recently, researchers in Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences (CAS) and Fudan University, have made progress in the study of nonlinear optical response and ultrafast carrier dynamics of titanium nitride (Ti3C2Tx) nanosheets, prepared a Ti3C2Tx MXene broadband ultrafast nonlinear activator, revealing the potential of Ti3C2Tx for optical computing applications. The related research results have been published in Advanced Optical Materials on June 14, 2022.

Ti3C2Tx is a layered semiconductor material with nonlinear optical response in a wide wavelength range. In this work, Ti3C2Tx nanosheets with appropriate thickness were obtained via liquid-phase exfoliation technique.

Scientists prepared an all-optical nonlinear activator that utilizes 2D Ti3C2Tx MXene combined with the microfiber to significantly enhance the interaction of light with Ti3C2Tx using the evanescent field propagating along the surface of the microfiber. The generated nonlinear optical response was used as a nonlinear activation function and applied in optical computing. Scientists verified the MNIST handwritten digit recognition and Fashion-MNIST classification tasks using the optical nonlinear activation function obtained from experimental measurements with an accuracy of 97.54% and 88.01%, respectively.

The all-optical nonlinear activation functions and their principle devices demonstrated in this work are of greater value to the development of all-optical computing for efficient computation.

Figure 1. Schematic diagram of optical neural network with MXene based nonlinear activator on the right. (Image by SIOM)

Figure 2. Evaluation of high-resolution images produced by super-resolution reconstruction in terms of subjective effects. (Image by SIOM)

Article website:

WU Xiufeng
General Administrative Office
Shanghai Institute of Optics and Fine Mechanics, CAS