1. Nonlocal phase-change metaoptics for reconfigurable nonvolatile image processing
- Author
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Yang, Guoce, Wang, Mengyun, Lee, June Sang, Farmakidis, Nikolaos, Shields, Joe, de Galarreta, Carlota Ruiz, Kendall, Stuart, Bertolotti, Jacopo, Moskalenko, Andriy, Huang, Kairan, Alù, Andrea, Wright, C. David, and Bhaskaran, Harish
- Subjects
Physics - Optics ,Condensed Matter - Mesoscale and Nanoscale Physics ,Physics - Applied Physics - 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., Comment: 20 pages, 5 figures
- Published
- 2024