Document Type

Journal Article

Department/Unit

Department of Physics

Title

Optimized optical “tractor beam” for core–shell nanoparticles

Abstract

It is known that core–shell subwavelength nanoparticles consisting of a dielectric shell and a metallic core can simultaneously support electric and magnetic dipolar resonances, which enhance forward scattering and suppress backward scattering. This creates favorable conditions for optical tractor beam applications. Using the generalized Lorenz–Mie theory and Maxwell stress tensor formulation, we demonstrate how optical pulling forces can be induced and optimized by first-order Bessel beams with appropriate polarization. The transverse stability of the core–shell nanoparticle under ambient damping is also verified by linear stability analysis and dynamical simulation.

Publication Year

2014

Journal Title

Optics Letters

Volume number

39

Issue number

8

Publisher

Optical Society of America

First Page (page number)

2399

Last Page (page number)

2402

Referreed

1

Funder

This work was supported by the China 973 Project (Nos. 2011CB922004 and 2013CB632701) and the China National Natural Science Foundation (No. 11174059). JN was also supported by HKBU 604011 and HKUST2/CRF/ 11G.

DOI

10.1364/OL.39.002399

ISSN (print)

01469592

Link to Publisher’s Edition

http://dx.doi.org/10.1364/OL.39.002399

ISSN (electronic)

15394794

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