Metalens Array for Complex-Valued Optical Discrete Fourier Transform

doi:10.1002/adom.202503016

2025-12-01

Randy Stefan Tanuwijaya

DOI：10.1002/adom.202503016

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摘要

En 中文

光子计算已作为一种有前景的平台涌现，用于加速需要高度并行性的计算任务，范围从信号和图像处理到神经网络任务。本研究提出了一种元-DFT（离散傅里叶变换），这是一种单层超表面器件，旨在以数字时间复杂度执行光复数到复数的DFT。自由空间光计算的挑战之一在于数字误差控制。该方案通过将光在空间上分离成离散的焦点来应对这一挑战，借助集成参考超透镜的干涉方法实现复数相位重构，并辅以误差缓解方案。该器件的性能通过使用具有随机复数振幅和相位的输入向量进行了系统性评估，展示了其误差缓解能力，仅需每个输出焦点5个像素即可将误差减半。这些发现为超表面光学计算的发展铺平了道路，提供了一个稳健的框架，可轻松扩展到任意复数值矩阵-向量乘法（MVM）。

Keyword:

matrix-vector-multiplication

metasurface

nanophotonics

optical computing

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期刊

Advanced Optical Materials

IF:

7.2

论文数:

8.9K

被引数:

4.6W

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