Scientific Results

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: [Haghighi, I. Moaddel; Malossi, N.; Natali, R.; Di Giuseppe, G.; Vitali, D.] Univ Camerino, Sch Sci & Technol, Phys Div, I-62032 Camerino, MC, Italy.
[Malossi, N.; Natali, R.; Di Giuseppe, G.; Vitali, D.] INFN, Sez Perugia, I-06123 Perugia, Italy.
[Vitali, D.] 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.


Volume: 9 (3)      Pages from: 034031-1  to: 034031-15

KeyWords: quantum ground-state; mechanical oscillator; optomechanical system; optical-detection; squeezed-light
DOI: 10.1103/PhysRevApplied.9.034031

Citations: 17
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