Super free spectral range tunable optical microbubble resonator

Abstract

An optical resonator is often called fully tunable if its tunable range exceeds the spectral interval that contains the resonances at all the characteristic modes of this resonator. For high-Q-factor spheroidal and toroidal microresonators, this interval coincides with the azimuthal free spectral range (FSR). In this Letter, we demonstrate what we believe to be the first mechanically fully tunable spheroidal microresonator created of a silica microbubble having a 100microm order radius and 1microm order wall thickness. The tunable bandwidth of this resonator is more than two times greater than its azimuthal FSR.

Dispersion analysis of whispering gallery mode microbubble resonators

“…Whispering gallery resonators typically have small mode volumes V and high Q-factors which allow for high energy densities and long photon storage lifetimes [6]. One specific class of whispering gallery resonators that has gained considerable interest in recent years are microbubble resonators [7][8][9][10][11][12][13][14][15][16][17]. Microbubble (or microshell) resonators are thin-walled spherical shells that can support whispering gallery modes with evanescent fields inside and outside of the resonator [10].…”

Analytical approach to the design of microring resonators for nonlinear four-wave mixing applications

“…While an in-depth study of the dependence of the dispersion properties on the device geometry is of great practical interest, it is, however, beyond the scope of the current article. More detailed investigations and comparisons of the resonance spectrum with other types of microcavities [18,32], will instead be the topic of future work.…”

Whispering-gallery modes of μ-optic silicon bottle resonator examined using a Fourier–Bessel eigen-state approach

“…The multimode nature of the bottle confined states permits the specification of two types of free-spectral ranges; [23][24][25][26] wavelength spacing of similar states with adjacent azimuthal order; and wavelength spacing of adjacent modes within an azimuthal order. Figure 9 shows the free-spectral ranges computed for the fundamental mode, R 0 Z 0 , plotted on a log-log trace.…”