| Title |
High-angle deflection of metagrating-integrated laser emission for high-contrast microscopy / |
| Authors |
Juodėnas, Mindaugas ; Strandberg, Erik ; Grabowski, Alexander ; Gustavsson, Johan ; Šípová-Jungová, Hana ; Larsson, Anders ; Käll, Mikael |
| DOI |
10.1038/s41377-023-01286-0 |
| Full Text |
|
| Is Part of |
Light: science and applications.. London : Springer Nature. 2023, vol. 12, iss. 1, art. no. 251, p. 1-9.. ISSN 2095-5545. eISSN 2047-7538 |
| Abstract [eng] |
Flat metaoptics components are looking to replace classical optics elements and could lead to extremely compact biophotonics devices if integrated with on-chip light sources and detectors. However, using metasurfaces to shape light into wide angular range wavefronts with high efficiency, as is typically required in high-contrast microscopy applications, remains a challenge. Here we demonstrate curved GaAs metagratings integrated on vertical-cavity surface-emitting lasers (VCSELs) that enable on-chip illumination in total internal reflection and dark field microscopy. Based on an unconventional design that circumvents the aspect ratio dependent etching problems in monolithic integration, we demonstrate off-axis emission centred at 60° in air and 63° in glass with > 90% and > 70% relative deflection efficiency, respectively. The resulting laser beam is collimated out-of-plane but maintains Gaussian divergence in-plane, resulting in a long and narrow illumination area. We show that metagrating-integrated VCSELs of different kinds can be combined to enable rapid switching between dark-field and total internal reflection illumination. Our approach provides a versatile illumination solution for high-contrast imaging that is compatible with conventional microscopy setups and can be integrated with biophotonics devices, such as portable microscopy, NIR-II range bioimaging, and lab-on-a-chip devices. |
| Published |
London : Springer Nature |
| Type |
Journal article |
| Language |
English |
| Publication date |
2023 |
| CC license |
|
