近日，英国牛津大学Bhaskaran, Harish团队研究了用于可重构非易失性图像处理的非局部相变元光学。相关论文于2025年5月6日发表在《光：科学与应用》杂志上。

下一代智能成像和视觉系统将需要紧凑和可调的光学计算硬件来执行高速和低功耗的图像处理。这些要求正在推动计算元曲面的发展，以实现高效的前端模拟光学预处理器，特别是边缘检测能力。然而，仍然缺乏可重新配置或可编程的方案，这可能会大大增强这些设备在系统层面的影响。

研究组提出并实验演示了一种使用低损耗相变非局部超表面的可重构平面光学图像处理器。 当相变材料在其非晶相和结晶相之间转变时，超表面被配置为在空间频率空间中实现不同的传递函数。这使得边缘检测和亮场成像模式可以在同一设备上实现。超表面与~0.5的大数值孔径兼容，使其适用于高分辨率相干光学成像显微镜。相变可重构非局部超表面的概念可能使具有可切换多任务的人工智能辅助成像和视觉设备的新兴应用成为可能。

附：英文原文

Title: Nonlocal phase-change metaoptics for reconfigurable nonvolatile image processing

Author: Yang, Guoce, Wang, Mengyun, Lee, June Sang, Farmakidis, Nikolaos, Shields, Joe, Ruiz de Galarreta, Carlota, Kendall, Stuart, Bertolotti, Jacopo, Moskalenko, Andriy, Huang, Kairan, Al, Andrea, Wright, C. David, Bhaskaran, Harish

Issue&Volume: 2025-05-06

Abstract: The next generation of smart imaging and vision systems will require compact and tunable optical computing hardware to perform high-speed and low-power image processing. These requirements are driving the development of computing metasurfaces to realize efficient front-end analog optical pre-processors, especially for edge detection capability. Yet, there is still a lack of reconfigurable or programmable schemes, which may drastically enhance the impact of these devices at the system level. Here, we propose and experimentally demonstrate a reconfigurable flat optical image processor using low-loss phase-change nonlocal metasurfaces. The metasurface is configured to realize different transfer functions in spatial frequency space, when transitioning the phase-change material between its amorphous and crystalline phases. This enables edge detection and bright field imaging modes on the same device. The metasurface is compatible with a large numerical aperture of ~0.5, making it suitable for high resolution coherent optical imaging microscopy. The concept of phase-change reconfigurable nonlocal metasurfaces may enable emerging applications of artificial intelligence-assisted imaging and vision devices with switchable multitasking.

DOI: 10.1038/s41377-025-01841-x

Source: https://www.nature.com/articles/s41377-025-01841-x