Three-dimensional force measurements in optical tweezers formed with high-NA micromirrors

The three-dimensional trap stiffness of optical tweezers formed with high-NA micromirrors is investigated by back-focal-plane interferometry and power spectrum analysis. Normalized stiffness values of kappa(xy)/P-trap =1.2(mu N/m)/mW and kappa(z)/P-trap = 0.52(mu N/m)/mW in the transverse and axial directions, respectively, have been measured for polystyrene spheres with a radius of 1.03 mu m. Compared with high-NA microscope objectives, micromirrors achieve much better trapping performances, particularly in the axial direction. (C) 2009 Optical Society of America


Published in:
Optics Letters, 34, 1063-1065
Year:
2009
Publisher:
Optical Society of America
ISSN:
0146-9592
Keywords:
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 Record created 2012-06-20, last modified 2018-03-18

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