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We realized on-chip silica microspheres, featuring excellent thermal coupling to the silicon-wafer. These chip-based microspheres can overcome the problem of thermal bistability and are especially suitable for optomechanical studies in vacuum or at low temperature.
We report an experimental demonstration of storing an optical pulse as a mechanical excitation in a silica microsphere. The storage lifetime is determined by the relatively long damping time of the mechanical excitation.
We report experimental studies, in which NV centers in a diamond nanopillar at 10 K are coupled to a high-Q silica microsphere whose resonance frequency can be tuned over a 500 GHz range.
Deformed silica microspheres are used to greatly enhance evanescent coupling between whispering gallery modes and nitrogen vacancy centers in a diamond nanopillar, overcoming the difficulty of short evanescent decay length of the composite cavity-QED system.
A composite cavity QED system, which couples nitrogen vacancy centers in a diamond nanopillar to whispering gallery modes in a silica microsphere and overcomes limitations of earlier diamond nanocrystal based systems, is demonstrated.
Sideband opto-mechanical cooling of vibrational modes in a silica microresonator is demonstrated in a cryogenic environment. Average phonon occupation numbers as low as 25 are obtained for mechanical modes with frequencies near 100 MHz.
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