Optomechanical Manipulation With Hyperbolic Metasurfaces

Keywords

anisotropic substrate; hyperbolic dispersion; multilayer; nanoparticle; optical pulling forces; optical tweezers; surface plasmon; tractor beam

Abstract

Auxiliary nanostructures introduce additional flexibility into optomechanical manipulation schemes. Metamaterials and metasurfaces capable to control electromagnetic interactions at the near-field regions are especially beneficial for achieving improved spatial localization of particles, reducing laser powers required for trapping, and for tailoring directivity of optical forces. Here, optical forces acting on small particles situated next to anisotropic substrates, are investigated. A special class of hyperbolic metasurfaces is considered in details and is shown to be beneficial for achieving strong optical pulling forces in a broad spectral range. Spectral decomposition of Green's functions enables identifying contributions of different interaction channels and underlines the importance of the hyperbolic dispersion regime, which plays the key role in optomechanical interactions. Homogenized model of the hyperbolic metasurface is compared to its metal-dielectric multilayer realizations and is shown to predict the optomechanical behavior under certain conditions related to composition of the top layer of the structure and its periodicity. Optomechanical metasurfaces open a venue for future fundamental investigations and a range of practical applications, where accurate control over mechanical motion of small objects is required.

Publication Date

11-21-2018

Publication Title

ACS Photonics

Volume

5

Issue

11

Number of Pages

4371-4377

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acsphotonics.8b00775

Socpus ID

85056153172 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85056153172

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