High-angle deflection of metagrating-integrated laser emission for high-contrast microscopy
Artikel i vetenskaplig tidskrift, 2023

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(degrees) in air and 63(degrees) 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.

Författare

Mindaugas Juodenas

Chalmers, Fysik, Nano- och biofysik

Erik Strandberg

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Alexander Grabowski

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Johan Gustavsson

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Hana Jungová

Chalmers, Fysik, Nano- och biofysik

Anders Larsson

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Mikael Käll

Chalmers, Fysik, Nano- och biofysik

Light: Science and Applications

20955545 (ISSN) 2047-7538 (eISSN)

Vol. 12 1 251

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1038/s41377-023-01286-0

PubMed

37833318

Mer information

Senast uppdaterat

2023-11-24