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(Color online) Scanning electron micrograph (SEM) of a GaAs microdisk with a diameter of . The insets show SEM of the smooth microdisk sidewall and an optical microscope image of the evanescent light coupling scheme between a tapered optical fiber and the microdisk.
(Color online) (a) Relative transmission through a tapered optical fiber as a function of the laser power when the fiber is positioned about from the microdisk. (b) The normalized transmission spectrum near the resonant wavelengths of whispering-gallery modes (WGMs), with a fitted curve that is given by the superposition of two Lorentzian curves and a sinusoidal trace shown in (c).
(Color online) Group delays and corresponding optical phases for disks with different WGM splittings. The high- WGMs are splited by for (a) and (c) and for (b) and (d), respectively. The experimental group delay spectra are compared with the theoretical fitting curves in (a) and (b), where the dotted lines are the reference group delay. The theoretical curves of phase shifts near the WGM resonances are presented along with the transmission spectra in (c) and (d).
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