Chip-based Radiation-pressure-driven Mechanical Oscillations In WGM Microcavity And Coupled Microcavities System

Recently,with the rapid developments of high quality factor optical/mechanical resonators and nanofabrication techniques,cavity optomechanics has emerged as a new research field.So far,cavity optomechanical effects have been realized in a wide range of platforms,such as SiNX membrane,whispering-gallery-mode(WGM)optical microcavities,and optomechanical crystals.These systems have been used in achieving quantum ground-state cooling,ultra-sensitive displacement measurements,optomechanical oscillators,as well as tunable photonic devices.Based on chip-basedsilica WGM microcavityandcompound microcavity system,we have realized mechanical oscillators in silica microdisk cavity and low threshold phonon laser.Besides,more interesting and important experiments such as optomechanical cooling and opto-mechanical induced transparency could be carried out in our experiment system.The main content of the thesis is listed as follows:1.Radiation-pressure-driven echanical oscillations in silica microdisk resonators on chip.Compared to toroid and microsphere,microdisk could be precisely controlled in size,leading to a tunable method for mechanical frequency.Furthermore,We also compared oscillation threshold of microdisks in air and vacuum,which was 62.5 ?W and 26.6 ?W,respectively.2.Low threshold phonon laser in vacuum based on compound microcavity system.By optimizing mechanical property of microtoroid,we have realized compound microcavity system with high mechanical factor,and phonon laser with low threshold.Optomechanical cooling was also observed.