Nanomechanical Dissipation and Strain Engineering

TL;DR

This paper reviews recent advances in nanomechanical resonators, highlighting methods like strain engineering and dissipation dilution that have achieved near-billion quality factors at room temperature, enabling low dissipation applications.

Contribution

It provides a pedagogical overview of new techniques to enhance quality factors in nanomechanical resonators, including strain engineering and structural design innovations.

Findings

Quality factors near a billion at room temperature achieved

Methods include acoustic bandgaps, nested structures, and dissipation dilution

Potential applications in quantum computing and sensing

Abstract

Nanomechanical resonators have applications in a wide variety of technologies ranging from biochemical sensors to mobile communications, quantum computing, inertial sensing, and precision navigation. The quality factor of the mechanical resonance is critical for many applications. Until recently, mechanical quality factors rarely exceeded a million. In the past few years however, new methods have been developed to exceed this boundary. These methods involve careful engineering of the structure of the nanomechanical resonator, including the use of acoustic bandgaps and nested structures to suppress dissipation into the substrate, and the use of dissipation dilution and strain engineering to increase the mechanical frequency and suppress intrinsic dissipation. Together, they have allowed quality factors to reach values near a billion at room temperature, resulting in exceptionally low dissipation. This review aims to provide a pedagogical introduction to these new methods, primarily targeted to readers who are new to the field, together with an overview of the existing state-of-the-art, what may be possible in the future, and a perspective on the future applications of these extreme-high quality resonators.