Electro-optical computing systems are promising for future energy-efficient computing, while scalable, dual electrical-optical functionality and low energy-consumption electrical-optical devices are not yet implemented on-chip. In this work, with a tailored design for better heat confinement, we implement scalable phase-change devices with dual electrical-optical functionality. They show ultralow programming energy for both electrical and optical switching in a pico-joule scale, which is orders lower than other integrated electro-optical phase change devices, multilevel switching until 20% contrast, good cyclability, and readout in both electrical and optical domains.
Nonlocal metasurfaces, which have uniform geometric arrangements but respond to incident angles differently, are uniquely capable of processing images. Phase change materials are promising functional building blocks to make metasurfaces reconfigurable owing to the significant refractive index contrast between amorphous and crystalline states. This presentation shows a novel tunable nonlocal metasurface based on the lossless phase change material Sb2Se3. It demonstrates the integration of two on-demand switchable functions, bright field imaging and second-order spatial differential imaging, on a single device.
There is a growing interest in the use of chalcogenide phase-change materials (PCMs) for reconfigurable metasurfaces to realize next-generation compact adaptive optical systems. However, the application of the classic PCM composition such as Ge2Sb2Te5 for near infrared metasurfaces has been limited due to its high absorption in the crystalline state. Here, by using an ultralow-loss and high-index phase-change material Sb2Se3, we show reconfigurable metasurfaces can manipulate light efficiently in near infrared region with comparable efficiencies in both the amorphous and crystalline states of the material.
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