title: Finite element simulation of a perturbed axial-symmetric whispering-gallery mode and its use for intensity enhancement with a nanoparticle coupled to a microtoroid.
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.
authors.affiliation: Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Alex
authors.initials: A
authors.lastname: Kaplan
authors.forename: Matthew
authors.initials: M
authors.lastname: Tomes
authors.forename: Tal
authors.initials: T
authors.lastname: Carmon
authors.forename: Maxim
authors.initials: M
authors.lastname: Kozlov
authors.forename: Oren
authors.initials: O
authors.lastname: Cohen
authors.forename: Guy
authors.initials: G
authors.lastname: Bartal
authors.forename: Harald G L
authors.initials: HG
authors.lastname: Schwefel
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D008904:Miniaturization; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers