Out-of-equilibrium optomechanical resonance self-excitation
- URL: http://arxiv.org/abs/2208.11390v1
- Date: Wed, 24 Aug 2022 09:27:30 GMT
- Title: Out-of-equilibrium optomechanical resonance self-excitation
- Authors: P. Milde, M. Langenhorst, H. H\"olscher, J. Rottmann-Matthes, D.
Hundertmark, L. M. Eng, and R. Hoffmann-Vogel
- Abstract summary: tuning of the laser power leads to nonlinear optomechanical effects that can dramatically increase the effective quality factor of the cantilever leading to out-of-equilibrium noise.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: The fundamental sensitivity limit of atomic force microscopy is strongly
correlated to the thermal noise of the cantilever oscillation. A method to
suppress this unwanted noise is to reduce the bandwidth of the measurement, but
this approach is limited by the speed of the measurement and the width of the
cantilever resonance, commonly defined through the quality factor Q. However,
it has been shown that optomechanical resonances in interferometers might
affect the cantilever oscillations resulting in an effective quality factor
Q$_{eff}$ . When the laser power is sufficiently increased the cantilever
oscillations might even reach the regime of self-oscillation. In this
self-oscillation state, the noise of the system is partially determined by the
interaction with the laser light far from equilibrium. Here, we show and
discuss how tuning of the laser power leads to nonlinear optomechanical effects
that can dramatically increase the effective quality factor of the cantilever
leading to out-of-equilibrium noise. We model the effects using a fourth order
nonlinearity of the damping coefficient.
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