摘要
Taperedfiberswithdiametersrangingfrom1to4μmarewidelyusedtoexcitethewhispering-gallery(WG)modesofmicrocavities.Typically,thetransmissionspectrumofaWGcavitycoupledtoawaveguidearoundaresonanceassumesaLorentziandipmorphologyduetoresonantabsorptionofthelightwithinthecavity.Inthispaper,wedemonstratethatthetransmissionspectraofaWGcavitycoupledwithanultrathinfiber(500–700nm)mayexhibitbothLorentziandipsandpeaks,dependingonthegapbetweenthefiberandthemicrocavity.Byconsideringthelargescatteringlossofoff-resonantlightfromthefiberwithinthecouplingregion,thisphenomenoncanbeattributedtopartiallyresonantlightbypassingthelossyscatteringregionviaWGmodes,allowingittobecoupledbothtoandfromthecavity,thenmanifestingasLorentzianpeakswithinthetransmissionspectra.Thisimpliesthesystemcouldbeimplementedwithinabandpassfilterframework.
出版日期
2017年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
