Design considerations for effective thermal management in mobile nanotweezers

Ghosh, S and Ghosh, A (2020) Design considerations for effective thermal management in mobile nanotweezers. In: Journal of Micro-Bio Robotics .

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Abstract

Controlled manipulation of nanoscale objects in fluids is relevant to both fundamental studies and technological advances in nanotechnology. While standard techniques of nanomanipulation, such as optical and plasmonic tweezers have limitations in simultaneous trapping and transport of nanoscale cargo, magnetically driven plasmonic nanorobots under optical illumination provide a promising solution. These so called mobile nanotweezers (MNT) use strongly localized electromagnetic field near plasmonic nanostructures to trap objects with high efficiency and can simultaneously be driven by magnetic fields to selectively trap, transport and release colloidal cargo. Upon illumination, apart from strong optical gradient forces due to local electric field enhancement, additional fluidic forces arise due to the heat generated by absorption of light. Here, we present a method to understand and engineer thermally induced fluidic forces in mobile nanotweezers. The temperature enhancement and associated thermofluidic forces are studied as a function of MNT geometry. We also discuss illumination at wavelengths slightly detuned from plasmon resonance frequency, which produces sufficient field enhancement with negligible generation of heat, and therefore much reduced thermophoretic and convective forces. This allowed us to engineer thermoplasmonic forces in MNTs for enhanced trapping performance and diverse applications.

Item Type:	Journal Article
Publication:	Journal of Micro-Bio Robotics
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer
Keywords:	Electric fields; Electromagnetic fields; Micromanipulators; Nanotechnology; Optical tweezers; Plasmonics; Sols, Cargo transport; Microrobots; Nanomanipulations; Plasmonic heating; Plasmonic tweezer, Freight transportation
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	14 Feb 2020 10:19
Last Modified:	14 Feb 2020 10:19
URI:	http://eprints.iisc.ac.in/id/eprint/64527

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