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Tapered fibers with diameters ranging from 1-4 micron are widely used toexcite the whispering-gallery (WG) modes of microcavities. Typically, thetransmission spectrum of a WG cavity coupled to a waveguide around a resonanceassumes a Lorentzian dip morphology due to resonant absorption of the lightwithin the cavity. In this paper, we demonstrate that the transmission spectraof a WG cavity coupled with an ultrathin fiber (500-700nm) may exhibit bothLorentzian dips and peaks, depending on the gap between the fiber and themicrocavity. By considering the large scattering loss of off-resonant lightfrom the fiber within the coupling region, this phenomenon can be attributed topartially resonant light bypassing the lossy scattering region via WG modes,allowing it to be coupled both to and from the cavity, thence manifesting asLorentzian peaks within the transmission spectra, which implies the systemcould be implemented within a bandpass filter framework.

Bandpass transmission spectra of a whispering-gallery microcavity coupled to an ultrathin fiber