Excitation, detection, and passive cooling of a micromechanical cantilever using near-field of a microwave resonator

Hao, L.; Gallop, J. C.; Cox, D.
September 2009
Applied Physics Letters;9/14/2009, Vol. 95 Issue 11, p113501
Academic Journal
Micro/nanomechanical resonators are important for nanoscale and quantum physics. We show that a microwave near-field coaxial resonator system allows mechanical cantilever excitation on a scale much shorter than the microwave wavelength. Thermal noise is observed in the unexcited system, enabling room temperature displacement sensitivity of ∼70 fm/Hz1/2. The measured force between near-field probe and cantilever varies with separation, in excellent agreement with theory. Uniquely, optical excitation and read-out lasers are also included. We demonstrate passive cantilever mode cooling from 300 to 100 K by frequency detuning the microwave resonator and propose pulsed cooling operation to enable several high-sensitivity applications.


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