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5 March 2021 Experimental demonstration of light focusing achieved by monolithic high-contrast grating mirrors
Paulina Komar, Marcin Gębski, James A. Lott, Tomasz G. Czyszanowski, Michał Wasiak
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Proceedings Volume 11695, High Contrast Metastructures X; 116951Q (2021) https://doi.org/10.1117/12.2582505
Event: SPIE OPTO, 2021, Online Only
Abstract
Here we present how the monolithic high contrast grating (MHCG) mirror focuses light. The studied grating has a shape of a square with 300 micrometers side. The light focuses along one of the sides of the square. As a light source in our experiment we use a vertical-cavity surface-emitting laser that emits 980 nm. In our setup the light shines from above and the grating is on the bottom of the substrate. Based on numerous images taken by a camera attached to an optical microscope we generated a movie showing how the light intensity changes as a function of height above the grating. The FWHM at the focal point is around 5 micrometers and is observed around 200 micrometers above the top surface of the substrate. The measured focal length is in perfect agreement with the simulated data. Moreover, the light intensity at the focal point is more than 10 times larger as compared to the light intensity reflected by Au mirror reference. The project (POIR.04.04.00-00-4358/17) is financed by FNP
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Paulina Komar, Marcin Gębski, James A. Lott, Tomasz G. Czyszanowski, and Michał Wasiak "Experimental demonstration of light focusing achieved by monolithic high-contrast grating mirrors", Proc. SPIE 11695, High Contrast Metastructures X, 116951Q (5 March 2021); https://doi.org/10.1117/12.2582505
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KEYWORDS
Mirrors
Cameras
Gold
Light sources
Optical microscopes
Polishing
Vertical cavity surface emitting lasers
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