期刊
JOURNAL OF OPTICS
卷 15, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/7/075305
关键词
optical trapping; adaptive optics; trap stiffness; aberration correction
类别
资金
- EPSRC
- Royal Academy of Engineering
- Scottish University Physics Alliance (SUPA) prize studentship
- EU ACCORD scheme
- Imagine Optic
- Engineering and Physical Sciences Research Council [EP/H024891/1] Funding Source: researchfish
- EPSRC [EP/H024891/1] Funding Source: UKRI
In optical trapping systems the trap stiffness, or spring constant, deteriorates dramatically with trap depth due to optical aberrations and system misalignment. This can severely hamper studies that employ optical tweezers to make accurate quantitative measurements. Here, a deformable membrane mirror is used, in conjunction with a random search algorithm, to correct for these aberrations by optimizing on a merit factor that is directly proportional to the trap stiffness. Previous studies have sought to address this issue but none have used a merit factor that is directly proportional to the trap stiffness. We demonstrate that the lateral trap stiffness, measured with and without aberration correction at increasing depths, improves throughout the trapping range of a conventional trap and allows us to extend the maximum depth at which we can trap from 136 to 166 mu m. At a depth of 131 mu m, trap stiffness improved by factors of 4.37 and 3.31 for the x- and y-axes respectively. The aberration correction resulted in deformable membrane mirror shapes where a single shape could be applied throughout a wide range of trap depths, showing significant improvement, and had the added benefit of making the lateral trapping forces more uniform in x and y.
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