2025-02-20 ワシントン大学セントルイス校
<関連情報>
- https://source.washu.edu/2025/02/collection-of-tiny-antennas-can-amplify-control-light/
- https://engineering.washu.edu/news/2025/Collection-of-tiny-antennas-can-amplify-and-control-light-polarized-in-any-direction.html
- https://pubs.acs.org/doi/full/10.1021/acs.nanolett.4c05260
偏光に依存しない高Q位相勾配メタサーフェス Polarization-Independent High-Q Phase Gradient Metasurfaces
Bo ZhaoLin Lin,and Mark Lawrence
Nano Letters Published: January 28, 2025
DOI:https://doi.org/10.1021/acs.nanolett.4c05260
Abstract
Dielectric metasurfaces have emerged as an unprecedented platform for precise wavefront manipulation at subwavelength scales with nearly zero loss. When aiming at dynamic applications such as AR/VR and LiDAR, high-quality factor (high-Q) phase gradient metasurfaces have emerged as a way to boost weak light–material interactions in flat-optical components. However, resonant features are naturally tied to polarization, limiting devices to operating on a single polarization state, which reduces the efficiency and adaptability of wave-shaping. Here, we propose polarization-independent high-Q phase gradient metasurfaces, where two cross-polarized dipolar guided mode resonances (DGMRs) with similar Q around 300 are spectrally aligned while being spatially tuned. Our simulations demonstrate that, by adding less than 5% geometric perturbation, the metasurface can steer arbitrarily polarized beams to 31° with diffraction efficiency >70%. These devices show potential for advancing programmable polarization-independent wavefront shaping and unlocking ways to efficiently sculpt nonlinear frequency generation and mixing processes.
