Laser spot position dependence in photothermal mode cooling of a microcantilever

We explore the laser spot position (LSP) dependence of photothermal mode cooling in a microcantilever-based Fabry-Perot cavity. Experiments on photothermal cooling demonstrate that the direction of photothermal backaction on the first two cantilever modes is LSP dependent, which can be either parall...

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Bibliographic Details
Published in:Optics letters 2012-02, Vol.37 (4), p.584-586
Main Authors: Fu, Hao, Liu, Cunding, Liu, Yong, Chu, Jiaru, Cao, Gengyu
Format: Article
Language:English
Subjects:
Cooling
Fabry-Perot
Holes
Joining
Lasers
Levers
Simulation
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Summary:We explore the laser spot position (LSP) dependence of photothermal mode cooling in a microcantilever-based Fabry-Perot cavity. Experiments on photothermal cooling demonstrate that the direction of photothermal backaction on the first two cantilever modes is LSP dependent, which can be either parallel or antiparallel. A theoretical analysis of this LSP-dependent effect identifies the parallel and the antiparallel coupling regions along the lever. Simulation results are in quantitative agreement with our experimental observations. We conclude that the cooling limit imposed by photothermal mode coupling can be surmounted by operating in the parallel coupling region.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000584