Sensitivity-Bandwidth Limit in a Multimode Optoelectromechanical Transducer

Year: 2018

Authors: Haghighi I.M., Malossi N., Natali R., Di Giuseppe G., Vitali D.

Autors Affiliation: Univ Camerino, Sch Sci & Technol, Phys Div, I-62032 Camerino, MC, Italy; INFN, Sez Perugia, I-06123 Perugia, Italy; CNR INO, Largo Enrico Fermi 6, I-50125 Florence, Italy.

Abstract: An optoelectromechanical system formed by a nanomembrane capacitively coupled to an LC resonator and to an optical interferometer has recently been employed for the highly sensitive optical readout of rf signals [T. Bagci et al., Nature (London) 507, 81 (2013)]. 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. With a proof-of-principle device operating at room temperature, we achieve a sensitivity of 300 nV/root Hz over a bandwidth of 15 kHz in the presence of radio-frequency noise, and an optimal shot-noise-limited sensitivity of 10 nV/root Hz over a bandwidth of 5 kHz. We discuss strategies for improving the performance of the device, showing that, for the same given sensitivity, a mechanical multimode transducer can achieve a bandwidth significantly larger than that for a single-mode one.

Journal/Review: PHYSICAL REVIEW APPLIED

Volume: 9 (3)      Pages from: 34031-1  to: 34031-15

More Information: We acknowledge the support of the European Commission through the ITN-Marie Curie project Cavity Quantum Optomechanics (cQOM), FP7 FET-Open Project No. 323924 Interfacing Quantum Optical, Electrical, and Mechanical Systems (iQUOEMS), and H2020-FETPROACT-2016 Project No. 732894 Hybrid Optomechanical Technologies (HOT). We also thank Norcada for providing us the Nb metalized SiN membranes.
KeyWords: Quantum Ground-state; Mechanical Oscillator; Optomechanical System; Optical-detection; Squeezed-light; Motion; Resonator; Microwave
DOI: 10.1103/PhysRevApplied.9.034031

Citations: 37
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