Asimina Arvanitaki, Andrew A. Geraci
We propose a tunable resonant sensor to detect gravitational waves in the frequency range of 30 - 300 kHz using optically trapped and cooled dielectric microspheres or micro-discs. The technique we describe can exceed the sensitivity of laser-based gravitational wave observatories in this frequency range by 1 - 3 orders of magnitude, using an instrument of only a few percent of their size. Such a device extends the search volume for 100 kHz gravitational wave sources by more than 10^6, and could detect monochromatic gravitational radiation from the annihilation of QCD axions in the cloud they form around stellar mass black holes within our galaxy due to the superradiance effect.
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http://arxiv.org/abs/1207.5320
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