E-Thesis 40 views 16 downloads
Backaction suppression in levitated optomechanics / RAFAL GAJEWSKI
Swansea University Author: RAFAL GAJEWSKI
DOI (Published version): 10.23889/SUThesis.67075
Abstract
In this thesis, we show that the backaction noise acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilising a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect, discussing the theor...
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Swansea University, Wales, UK
2024
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Bateman, J. E. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa67075 |
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| Abstract: |
In this thesis, we show that the backaction noise acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilising a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect, discussing the theoretical and experimental constraints. We model the backaction noise by computing the spectral density of force fluctuations acting on the particle trapped at the centre of a spherical mirror. We also compute the corresponding measurement imprecision in an interferometric, shot-noise-limited position measurement and show that backaction and imprecision agree, recovering the Heisenberg limit of detection. The remainder of the thesis is devoted to analysis and a report on the construction of two novel trapping configurations which could be used to study the backaction suppression effect. |
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| Item Description: |
A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. |
| Keywords: |
Physics |
| College: |
Faculty of Science and Engineering |
| Funders: |
EPSRC |