Characterization of optical trap for metallic particles using external magnetic field

Vivek S. Jadhav; Wasim Sayyad; G. R. Kulkarni; B. M. Jaffar Ali

doi:10.1117/12.874874

16 February 2011 Characterization of optical trap for metallic particles using external magnetic field

Vivek S. Jadhav, Wasim Sayyad, G. R. Kulkarni, B. M. Jaffar Ali

Proceedings Volume 7950, Complex Light and Optical Forces V; 79500Y (2011) https://doi.org/10.1117/12.874874
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

We report a method to optically trap and micromanipulate metallic particles using IR laser. The experiment demonstrates the trapping of metallic particle using low NA objective lens (0.6 N.A). Unlike single beam gradient trapping of dielectric objects, the optical trapping of metallic particles occurs due to diffraction effect. We thus provide evidence for non-gradient forces playing a dominant role in the trapping of metallic particles, in here for the case of 3μm Fe particles, efficient trapping occurs at off-axis position (in the side lobes) of a focused laser beam. The optical trap is characterized by measuring the external magnetic field required to dislodge the Fe particle, and was found to be 0.03T to 0.11T for laser power 5 to 55mW at the sample.

Citation Download Citation

Vivek S. Jadhav, Wasim Sayyad, G. R. Kulkarni, and B. M. Jaffar Ali "Characterization of optical trap for metallic particles using external magnetic field", Proc. SPIE 7950, Complex Light and Optical Forces V, 79500Y (16 February 2011); https://doi.org/10.1117/12.874874

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