Feedback-enhanced optical trapping force using a semiconductor laser

Authors

Taisuke Ohta National Institute of Physics, University of the Philippines Diliman
Darwin Te National Institute of Physics, University of the Philippines Diliman
Vincent Daria National Institute of Physics, University of the Philippines Diliman
Caesar Saloma National Institute of Physics, University of the Philippines Diliman

Abstract

We report a technique for enhanced trapping ofa microsphere using a low-power semiconductor laser. A gain in gradient trapping force is achieved by recycling the transmitted light through the sample back to the focal area consequently increasing the E-field necessary to trap the particle as well intensifying the laser power due to the presence of an external cavity (optical feedback). A semiconductor laser diode using an output power ~10 mW provides enough power to trap 3 and 5 μm sized polystyrene beads. The trappingforce increased by ~32% corresponding to an increase in optical power due to optical feedback.

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Issue

1999: Proceedings of the 17th National Physics Congress of the Samahang Pisika ng Pilipinas

Article ID

SPP-1999-SG-06

Section

Signal Processing and Instrumentation

Published

1999-10-22

How to Cite

[1]

T Ohta, D Te, V Daria, and C Saloma, Feedback-enhanced optical trapping force using a semiconductor laser, Proceedings of the Samahang Pisika ng Pilipinas 17, SPP-1999-SG-06 (1999). URL: https://proceedings.spp-online.org/article/view/SPP-1999-SG-06.