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  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper eb_1_4

Multimode Opto-Electro-Mechanical Transducer for Non-Reciprocal Conversion of Radio-Frequency and Optical Signals

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Abstract

An opto-electro-mechanical system formed by a nano-membrane capacitively coupled to an LC resonator and to an optical interferometer has recently been proposed and employed for the highly sensitive optical readout of radio-frequency signals [1]. We propose and experimentally demonstrate how the bandwidth of such a transducer can be increased by controlling the interference between two electromechanical interaction pathways of a two-mode mechanical system. We have realized a device based on a SiN nanomembrane coated with a 30 nm-thick Nb film which is coupled to an LC resonator and optically readout by an interferometer [2]. Operating this proof-of-principle device at room temperature, we achieve a sensitivity of 300 nV/√Hz over a bandwidth of 15 kHz in the presence of radio-frequency noise, and an optimal shot-noise-limited sensitivity of 10 nV/√Hz over a bandwidth of 5 kHz. The performance of the device can be improved by controlling the frequency mismatch of the two mechanical modes and the electrode distance and, for the same given sensitivity, a mechanical multimode transducer can achieve a bandwidth significantly larger than that for a single-mode one by creating constructive interference between the two opto-electro-mechanical interaction pathways [3].

© 2019 IEEE

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