Detection of individual metallic nanoparticles via plasmon-mediated optomechanical coupling

Author:

Antoni ThomasORCID,Makles Kevin,Chardin Clément1,Verlot Pierre

Affiliation:

1. The University of Nottingham

Abstract

Characterization of individual nanoparticles is a challenge due to the diffraction limit. To overcome this constraint we investigate the transfer of their optical properties to a mechanical degree of freedom of a larger object. From finite-difference time-domain computations, we estimate the mechanical frequency shift caused by metallic nanoparticles traveling through a microfluidic channel. Due to plasmonic effects we find relative shifts on the order of 1% for a 1 mW incident optical power for particles with radius ranging from 25 to 150 nm. The extreme sensitivity of this detection scheme enables real-time and in situ observation of optical dynamics at nanoscale.

Funder

Agence Nationale de la Recherche

H2020 European Research Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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