Plasmon-assisted optical trapping and anti-trapping

Light, Science & Applications
Aliaksandra IvinskayaAlexander S Shalin

Abstract

The ability to manipulate small objects with focused laser beams has opened a venue for investigating dynamical phenomena relevant to both fundamental and applied science. Nanophotonic and plasmonic structures enable superior performance in optical trapping via highly confined near-fields. In this case, the interplay between the excitation field, re-scattered fields and the eigenmodes of a structure can lead to remarkable effects; one such effect, as reported here, is particle trapping by laser light in a vicinity of metal surface. Surface plasmon excitation at the metal substrate plays a key role in tailoring the optical forces acting on a nearby particle. Depending on whether the illuminating Gaussian beam is focused above or below the metal-dielectric interface, an order-of-magnitude enhancement or reduction of the trap stiffness is achieved compared with that of standard glass substrates. Furthermore, a novel plasmon-assisted anti-trapping effect (particle repulsion from the beam axis) is predicted and studied. A highly accurate particle sorting scheme based on the new anti-trapping effect is analyzed. The ability to distinguish and configure various electromagnetic channels through the developed analytical theory provides ...Continue Reading

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Citations

Nov 13, 2018·Light, Science & Applications·Cheng-Wei Qiu, Lei-Ming Zhou
Aug 17, 2018·Optics Express·José A RodrigoTatiana Alieva
Nov 2, 2019·Optics Express·Mohammad Mahdi AbbasiMohammad Kazem Moravvej-Farshi
Mar 19, 2021·Light, Science & Applications·Yuquan ZhangXiaocong Yuan
Nov 17, 2017·Nano Letters·Preston R HuftNathan C Lindquist
Jun 28, 2018·Nano Letters·Hen MarkovichPavel Ginzburg
Dec 14, 2021·Nano Letters·Renchao JinYongmin Liu

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Methods Mentioned

BETA
plasmonic tweezers
optical tweezers
surface plasmon resonance

Software Mentioned

Comsol Multiphysics ( Comsol )

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