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Three-dimensional force calibration of a single-beam optical gradient trap

Paul Bartlett and Stuart Henderson1

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We have used a high-resolution back-focal-plane detector to make simultaneous measurements of the axial and lateral force constants of a micron-sized particle in a single-beam optical gradient trap. We measure the optical force applied to the trapped particle as a function of the relative index of refraction of particle and medium, the radius of the particle, and the laser beam power. Results are compared with recent theoretical predictions.


PACS

42.79.Pw Imaging detectors and sensors

07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors

37.10.Vz Mechanical effects of light on atoms, molecules, and ions

06.20.F- Units and standards

42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation

Subjects

Atomic and molecular physics

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 33 (26 August 2002)

Received 1 July 2002

Published 9 August 2002



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