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Geometric-phase metalens to be used for tunable optical tweezers in microfluidics.

Authors :
Geromel, René
Rennerich, Roman
Zentgraf, Thomas
Kitzerow, Heinz
Source :
Liquid Crystals. May2023, Vol. 50 Issue 7-10, p1193-1203. 11p.
Publication Year :
2023

Abstract

Geometric-phase dielectric meta-lenses made of silicon with high numerical aperture and short focal lengths are fabricated and characterised. For circularly polarised light, the same meta-lens can act as a converging or diverging lens, depending on the handedness of the circular polarisation. This effect enables application for optical tweezers that trap or release µm-size polymer beads floating in a microfluidic channel on demand. An electrically addressable polarisation converter based on liquid crystals may be used to switch between the two states of polarisation, at which the light transmitted through the meta-lens is focused (trapping) or defocussed (releasing), respectively. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02678292
Volume :
50
Issue :
7-10
Database :
Academic Search Index
Journal :
Liquid Crystals
Publication Type :
Academic Journal
Accession number :
174083931
Full Text :
https://doi.org/10.1080/02678292.2023.2171146