Helicity and Polarization Gradient Optical Trapping in Evanescent Fields.

Autor:	Lu J; Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA., Ginis V; Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA.; Data Lab and Applied Physics, Vrije Universiteit Brussel, 1050 Brussel, Belgium., Lim SWD; Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA., Capasso F; Harvard John A. Paulson School of Engineering and Applied Sciences, 9 Oxford Street, Cambridge, Massachusetts 02138, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2023 Oct 06; Vol. 131 (14), pp. 143803.
DOI:	10.1103/PhysRevLett.131.143803
Abstrakt:	Optical traps using nonconservative forces instead of conservative intensity-gradient forces expand the trap parameter space. Existing traps with nonconservative helicity-dependent forces are limited to chiral particles and fields with helicity gradients. We relax these constraints by proposing helicity and polarization gradient optical trapping of achiral particles in evanescent fields. We further propose an optical switching system in which a microsphere is trapped and optically manipulated around a microfiber using polarization gradients. Our Letter deepens the understanding of light-matter interactions in polarization gradient fields and expands the range of compatible particles and stable trapping fields.
Databáze:	MEDLINE
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