Abstract
Transverse trapping force in laser tweezers is investigated in the presence of spherical aberration caused by the refractive-index mismatch between a cover slip and the water solution where particles are suspended. The transverse trapping efficiency is characterized in terms of the numerical aperture of a microscope objective and the thickness of a sample cell. It has been experimentally demonstrated that the spherical aberration can be compensated for by changing the effective tube length of an objective used for trapping. As a result, the transverse trapping efficiency can be improved by up to 20%. In principle, a further improvement in the trapping efficiency is possible if an objective of an infinitely-long tube length is used.
| Original language | English |
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| Pages (from-to) | 2159-2168 |
| Number of pages | 10 |
| Journal | Journal of Modern Optics |
| Volume | 45 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1 Jan 1998 |
| Externally published | Yes |