Feedback-enhanced optical trapping force using a semiconductor laser

Authors

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