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

Hao, L; Gallop, J C; Cox, D (2009) Excitation, detection and passive cooling of a micromechanical cantilever using near-field of a microwave resonator. Appl. Phys. Lett., 95 (11). 113501

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Abstract

Micro and nanomechanical resonators are important topics in nanoscale and quantum physics 1 with applications in ultra-low mass2, force3 and displacement4 metrology, approaching the standard quantum limit5 in future. Here we report a novel cantilever style micromechanical resonator excitation and readout method using a near-field 10 GHz microwave resonator probe. The coaxial resonator near-field allows cantilever excitation on a length scale much shorter than the microwave wavelength. The measured force between near-field probe and cantilever varies with separation distance, in excellent agreement with theory. The cantilever Q value rises to ~3000 in vacuum at room temperature. Thermal noise is observed in the unexcited system, limiting room temperature displacement sensitivity to ~ 70 fm/Hz1/2. Uniquely, optical excitation and read-out lasers are also included, enabling us to demonstrate passive cantilever mode cooling6,7,8, from 300K to 100K by detuning the microwave resonator from its centre frequency. The letter also proposes pulsed cooling operation to realise several sensitive metrology applications.

Item Type: Article
Keywords: NEMS, microwave near- field, dynamic cooling
Subjects: Quantum Phenomena
Quantum Phenomena > Nanophysics
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4507

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