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All optical dynamic nanomanipulation with active colloidal tweezers

Ghosh, Souvik and Ghosh, Ambarish (2019) All optical dynamic nanomanipulation with active colloidal tweezers. In: NATURE COMMUNICATIONS, 10 (1).

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Official URL: https://dx.doi.org/10.1038/s41467-019-12217-2

Abstract

Manipulation of colloidal objects with light is important in diverse fields. While performance of traditional optical tweezers is restricted by the diffraction-limit, recent approaches based on plasmonic tweezers allow higher trapping efficiency at lower optical powers but suffer from the disadvantage that plasmonic nanostructures are fixed in space, which limits the speed and versatility of the trapping process. As we show here, plasmonic nanodisks fabricated over dielectric microrods provide a promising approach toward optical nanomanipulation: these hybrid structures can be maneuvered by conventional optical tweezers and simultaneously generate strongly confined optical near-fields in their vicinity, functioning as near-field traps themselves for colloids as small as 40 nm. The colloidal tweezers can be used to transport nanoscale cargo even in ionic solutions at optical intensities lower than the damage threshold of living micro-organisms, and in addition, allow parallel and independently controlled manipulation of different types of colloids, including fluorescent nanodiamonds and magnetic nanoparticles.

Item Type: Journal Article
Additional Information: copyright for this article belongs to NATURE PUBLISHING GROUP
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 17 Oct 2019 09:38
Last Modified: 17 Oct 2019 09:38
URI: http://eprints.iisc.ac.in/id/eprint/63678

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