# Efficient anchor loss suppression in coupled near-field optomechanical resonators

## TL;DR

This paper demonstrates a method to significantly reduce mechanical radiation losses in silicon near-field optomechanical resonators, achieving high quality factors at room and cryogenic temperatures through coherent radiation cancellation.

## Contribution

The work introduces a dissipation suppression scheme based on coherent cancellation, enabling low-loss optomechanical resonators with high quality factors at different temperatures.

## Key findings

- Maximum Q of 7.61k at room temperature
- Q increases to 37k at 22 K
- Achieved high fQ-products indicating low dissipation

## Abstract

Elastic dissipation through radiation towards the substrate is a major loss channel in micro- and nanomechanical resonators. Engineering the coupling of these resonators with optical cavities further complicates and constrains the design of low-loss optomechanical devices. In this work we rely on the coherent cancellation of mechanical radiation to demonstrate material and surface absorption limited silicon near-field optomechanical resonators oscillating at tens of MHz. The effectiveness of our dissipation suppression scheme is investigated at room and cryogenic temperatures. While at room temperature we can reach a maximum quality factor of 7.61k ($fQ$-product of the order of $10^{11}$~Hz), at 22~K the quality factor increases to 37k, resulting in a $fQ$-product of $2\times10^{12}$~Hz.