A self-calibrating optomechanical force sensor with femtonewton resolution

TL;DR

This paper introduces a highly sensitive optomechanical force sensor capable of femtonewton resolution, featuring self-calibration via radiation pressure, suitable for atomic-scale force measurements in extreme environments.

Contribution

The development of a self-calibrating optomechanical sensor with femtonewton resolution and in situ calibration capability in extreme conditions.

Findings

Achieved quality factors of 4.3x10^6 at room temperature.

Demonstrated force resolution on the femtonewton scale.

Enabled in situ calibration in cryogenic ultra-high vacuum environments.

Abstract

We report the development of an ultrasensitive optomechanical sensor designed to improve the accuracy and precision of force measurements with atomic force microscopy. The sensors reach quality factors of 4.3x10^6 and force resolution on the femtonewton scale at room temperature. Self-calibration of the sensor is accomplished using radiation pressure to create a reference force. Self-calibration enables in situ calibration of the sensor in extreme environments, such as cryogenic ultra-high vacuum. The senor technology presents a viable route to force measurements at the atomic scale with uncertainties below the percent level.