Silicon-nitride nanosensors toward room temperature quantum optomechanics

Enrico Serra*, Antonio Borrielli, Francesco Marin, Francesco Marino, Nicola Malossi, Bruno Morana, Paolo Piergentili, Giovanni Andrea Prodi, Pasqualina Maria Sarro, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Micro- and nanomechanical resonators play a prominent part in many sensing and signal processing platforms due to their capability to pervasively couple with a wide variety of physical systems. Particularly relevant is their embedding in advanced optomechanical setups, which has recently pioneered optically cooled mechanical oscillators toward the quantum regime. A frequently adopted experimental scheme exploits a thin, highly tensioned Si 3N 4 nanomembrane where the membrane's vibrations are dispersively coupled to the optical mode of a Fabry-Pérot cavity. A significant effort has been done into realizing high-quality factor membranes, considering that low mechanical loss represents a benchmark to operate in the elusive quantum regime. In this article, we compare two state-of-the-art SiN resonators, realized exploiting the dilution of the material's intrinsic dissipation and efficient solutions to fully isolate the membrane from the substrate. In particular, we examine and discuss the interplay between the edge and distributed dissipation and propose an analytical approach to evaluate the total intrinsic loss. Also, our analysis delves into the sensitivity of the devices to a point-like force and a uniform-density force field. These results provide meaningful guidelines for designing new ultra-coherent resonating devices.

Original languageEnglish
Article number064503
Number of pages17
JournalJournal of Applied Physics
Volume130
Issue number6
DOIs
Publication statusPublished - 2021

Bibliographical note

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