Finite element simulation of a perturbed axialsymmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid

Alex Kaplan; Matthew Tomes; Tal Carmon; Maxim Kozlov; Oren Cohen; Guy Bartal; Harald G.L. Schwefel

doi:10.1364/OE.21.014169

Finite element simulation of a perturbed axialsymmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid

Alex Kaplan, Matthew Tomes, Tal Carmon^*, Maxim Kozlov, Oren Cohen, Guy Bartal, Harald G.L. Schwefel

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

We present an optical mode solver for a whispering gallery resonator coupled to an adjacent arbitrary shaped nano-particle that breaks the axial symmetry of the resonator. Such a hybrid resonator-nanoparticle is similar to what was recently used for bio-detection and for field enhancement. We demonstrate our solver by parametrically studying a toroid-nanoplasmonic device and get the optimal nano-plasmonic size for maximal enhancement. We investigate cases near a plasmonic resonance as well as far from a plasmonic resonance. Unlike common plasmons that typically benefit from working near their resonance, here working far from plasmonic resonance provides comparable performance. This is because the plasmonic resonance enhancement is accompanied by cavity quality degradation through plasmonic absorption.

Original language	English
Pages (from-to)	14169-14180
Number of pages	12
Journal	Optics Express
Volume	21
Issue number	12
DOIs	https://doi.org/10.1364/OE.21.014169
State	Published - Jun 2013
Externally published	Yes

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title = "Finite element simulation of a perturbed axialsymmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid",

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AU - Kaplan, Alex

AU - Tomes, Matthew

AU - Carmon, Tal

AU - Kozlov, Maxim

AU - Cohen, Oren

AU - Bartal, Guy

AU - Schwefel, Harald G.L.

PY - 2013/6

Y1 - 2013/6

N2 - We present an optical mode solver for a whispering gallery resonator coupled to an adjacent arbitrary shaped nano-particle that breaks the axial symmetry of the resonator. Such a hybrid resonator-nanoparticle is similar to what was recently used for bio-detection and for field enhancement. We demonstrate our solver by parametrically studying a toroid-nanoplasmonic device and get the optimal nano-plasmonic size for maximal enhancement. We investigate cases near a plasmonic resonance as well as far from a plasmonic resonance. Unlike common plasmons that typically benefit from working near their resonance, here working far from plasmonic resonance provides comparable performance. This is because the plasmonic resonance enhancement is accompanied by cavity quality degradation through plasmonic absorption.

AB - We present an optical mode solver for a whispering gallery resonator coupled to an adjacent arbitrary shaped nano-particle that breaks the axial symmetry of the resonator. Such a hybrid resonator-nanoparticle is similar to what was recently used for bio-detection and for field enhancement. We demonstrate our solver by parametrically studying a toroid-nanoplasmonic device and get the optimal nano-plasmonic size for maximal enhancement. We investigate cases near a plasmonic resonance as well as far from a plasmonic resonance. Unlike common plasmons that typically benefit from working near their resonance, here working far from plasmonic resonance provides comparable performance. This is because the plasmonic resonance enhancement is accompanied by cavity quality degradation through plasmonic absorption.

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Finite element simulation of a perturbed axialsymmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid

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