A zigzag optical cavity for sensing and controlling torsional motion
- URL: http://arxiv.org/abs/2306.12804v1
- Date: Thu, 22 Jun 2023 11:03:18 GMT
- Title: A zigzag optical cavity for sensing and controlling torsional motion
- Authors: Sofia Agafonova, Umang Mishra, Fritz Diorico, Onur Hosten
- Abstract summary: We propose a novel concept for sensing and manipulating torsional motion.
The concept inherently alleviates many limitations of previous approaches.
This work paves the way to new horizons for experiments at the interface of quantum mechanics and gravity.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Precision sensing and manipulation of milligram-scale mechanical oscillators
has attracted growing interest in the fields of table-top explorations of
gravity and tests of quantum mechanics at macroscopic scales. Torsional
oscillators present an opportunity in this regard due to their remarked
isolation from environmental noise. For torsional motion, an effective
employment of optical cavities to enhance optomechanical interactions -- as
already established for linear oscillators -- so far faced certain challenges.
Here, we propose a novel concept for sensing and manipulating torsional motion,
where exclusively the torsional rotations of a pendulum are mapped onto the
path length of a single two-mirror optical cavity. The concept inherently
alleviates many limitations of previous approaches. A proof-of-principle
experiment is conducted with a rigidly controlled pendulum to explore the
sensing aspects of the concept and to identify practical limitations in a
potential state-of-the art setup. Based on this work, we anticipate development
of precision torque sensors with sensitivities below $10^{-19}~\mathrm{N\cdot
m/\sqrt{Hz}}$ and with the motion of the pendulums dominated by quantum
radiation pressure noise at sub-microwatts of incoming laser power. This work,
therefore, paves the way to new horizons for experiments at the interface of
quantum mechanics and gravity.
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