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Eigenmode orthogonality breaking and anomalous dynamics in multimode nano-optomechanical systems under non-reciprocal
Laure Mercier de Lépinay1, Benjamin Pigeau1, Benjamin Besga1
1Institut Néel, Université Grenoble Alpes - CNRS:UPR2940, 38042, Grenoble, France.
Nature Communications
|April 13, 2018
Summary
Understanding thermal motion in nanomechanical probes is key for sensitive force detection. This study reveals how rotational force fields break eigenmode orthogonality, causing excess noise and modifying fluctuation-dissipation relations.
Area of Science:
- Nanotechnology
- Mechanical Engineering
- Statistical Physics
Background:
- Thermal motion in nanomechanical probes affects force sensing sensitivity.
- Understanding these fluctuations is crucial for advancing precision measurement.
Purpose of the Study:
- Investigate the impact of rotational optical force fields on nanomechanical probe dynamics.
- Analyze the resulting modifications in eigenmode behavior and their implications for force sensing.
Main Methods:
- Utilized a singly-clamped nanowire oscillating in two transverse directions.
- Introduced the nanowire into a rotational optical force field to induce non-symmetric coupling.
- Developed a theoretical model to quantitatively explain observed phenomena.
Main Results:
- Observed non-symmetric coupling of eigenmodes in the rotational force field.
- Demonstrated loss of intrinsic eigenmode orthogonality.
- Identified anomalous excess noise and violation of the fluctuation-dissipation relation.
Conclusions:
- The study presents a modified fluctuation-dissipation theorem valid for non-conservative rotational force fields.
- Highlights the significant role of non-axial mechanical susceptibilities in coupled multimode systems.
- Provides insights into thermal fluctuation behavior in systems with non-reciprocal coupling.
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