摘要
Opticalwhisperinggallerymicrocavitieswithhigh-qualityfactorshaveshowngreatpotentialtowardachieveingultrahigh-sensitivitysensinguptoasinglemoleculeornanoparticle,whichraisesahugedemandonadeeptheoreticalinsightintothecrucialphenomenasuchasthemodeshift,modesplitting,andmodebroadeninginsensingexperiments.Hereweproposeanintuitivemodeltoanalyzethesephenomenafromtheviewpointofthenanoparticle-inducedmultiplescatteringoftheazimuthallypropagatingmode(APM).ThemodelunveilsexplicitrelationsbetweenthesephenomenaandthephasechangeandenergylossoftheAPMwhenscatteredatthenanoparticle;themodelalsoexplainstheobservedpolarization-dependentpreservationofoneresonanceandtheparticle-dependentredshiftorblueshift.Themodelindicatesthattheparticle-inducedcouplingbetweenthepairofunperturbeddegeneratewhisperinggallerymodes(WGMs)andthecouplingbetweentheWGMsandthefree-spaceradiationmodes,whicharewidelyadoptedincurrenttheoreticalformalisms,arerealizedviathereflectionandscattering-inducedfree-spaceradiationoftheAPM,respectively,andadditionallyexhibitsthecontributionofcrosscouplingbetweentheunperturbedWGMsandotherdifferentWGMstoformingthesplittingresonantmodes,especiallyforlargeparticles.
出版日期
2017年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
