Study On The Optical Properties Of High-Q Whispering-Gallery-Mode Micro- Bubble Resonators

Whispering gallery (WG) mode micro resonators generally have ultrahigh Q factor and small mode volume, this characteristic makes such resonators uniquely suited for studies of nonlinear optics, opto-mechanics and optical sensors. This thesis mainly emphasizes on the design and fabrication of high-Q WGM micro-bubble resonators (MBR) for nonlinear optics, opto-mechanics and optical sensors.This thesis focuses on the following aspects:First, the real-time & fine manipulating technique for cavity dispersion is developed, and hyper-parametric oscillation and frequency come generation are observed in dispersion compensated MBRs experimentally. The MBRs’ cavity quality factor are 5×107, the theoretical results show its zero dispersion wavelength can be tuned between 0.8μm-1.6μm. Besides, high-nonlinear optical fluidics ring resonator, quasi- droplet high-nonlinear resonator, chalcogenide microsphere resonator are also fabricated, and the optical nonlinear process is studied in these micro-resonators.Second, by selectively exciting individual mechanical mode in a thin wall MBR, microfluidic opt-mechanical sensor,2-D optical & mechanical sensor, opto-mechanical mass sensor are developed, which shows MBRs have great potential as excellent opto-mechanical microfluidics devices and can be used as a highly supplementary tool to conventional biological and chemical sensors.Third, the mode-splitting of two coupled MBRs is studied theoretically and experimentally. By monitoring the mode-splitting separation, the common-mode noise is suppressed by two orders of magnitude without any external noise-suppression techniques. Then we applied the device to experimentally detect bovine serum albumin with a concentration detection limit on the order of 1 pg/mL (-15 fM).Finally, a hybrid WGM micro resonator with ultra-high Q factor is fabricated by coating a thin silver film on the inner surface of an MBR. The strong coupling between the low Q interior plasmatic and high Q (above 105) exterior hybrid WG modes is observed in experiment.