2024-01-17 ハーバード大学
◆研究では、大規模なレンズの製造における工学的な課題を解決し、金属レンズを使用して太陽や月、星雲などを撮影する実証を行いました。
＜関連情報＞
- https://seas.harvard.edu/news/2024/01/metalens-meets-stars
- https://pubs.acs.org/doi/full/10.1021/acsnano.3c09462
直径100mmのオールガラス製可視メタレンズで宇宙をイメージング All-Glass 100 mm Diameter Visible Metalens for Imaging the Cosmos
Joon-Suh Park, Soon Wei Daniel Lim, Arman Amirzhan, Hyukmo Kang, Karlene Karrfalt, Daewook Kim, Joel Leger, Augustine Urbas, Marcus Ossiander, Zhaoyi Li, and Federico Capasso
ACS Nano Published:January 17, 2024
DOI:https://doi.org/10.1021/acsnano.3c09462
Abstract
Metasurfaces, optics made from subwavelength-scale nanostructures, have been limited to millimeter-sizes by the scaling challenge of producing vast numbers of precisely engineered elements over a large area. In this study, we demonstrate an all-glass 100 mm diameter metasurface lens (metalens) comprising 18.7 billion nanostructures that operates in the visible spectrum with a fast f-number (f/1.5, NA = 0.32) using deep-ultraviolet (DUV) projection lithography. Our work overcomes the exposure area constraints of lithography tools and demonstrates that large metasurfaces are commercially feasible. Additionally, we investigate the impact of various fabrication errors on the imaging quality of the metalens, several of which are specific to such large area metasurfaces. We demonstrate direct astronomical imaging of the Sun, the Moon, and emission nebulae at visible wavelengths and validate the robustness of such metasurfaces under extreme environmental thermal swings for space applications.
