Optical manipulation of metal-silica hybrid nanoparticles

Rodney R. Agayan; Thomas Horvath; Brandon H. McNaughton; Jeffrey N. Anker; Raoul Kopelman

doi:10.1117/12.559757

18 October 2004 Optical manipulation of metal-silica hybrid nanoparticles

Rodney R. Agayan, Thomas Horvath, Brandon H. McNaughton, Jeffrey N. Anker, Raoul Kopelman

Proceedings Volume 5514, Optical Trapping and Optical Micromanipulation; (2004) https://doi.org/10.1117/12.559757
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Metallic nanoparticles are known to experience enhanced optical trap strengths compared to dielectric particles due to the increased optical volume, or polarizability. In our experience, larger metallic particles (~micron) are not easily trapped because momentum effects due to reflection become significant. Hybrid particles comprised of both metal and dielectric materials can circumvent this limitation while still utilizing a larger polarizability. Heterogeneous nanosystems were fabricated by embedding/coating silica nanoparticles with gold or silver in varying amounts and distributions. These compound particles were manipulated via optical tweezers, and their trapping characteristics quantitatively and qualitatively compared to homogeneous particles of comparable size. The parameters explored include the dependence of the trapping force on the percentage of loading of gold, the size of the embedded colloids, and the distribution of metal within the surrounding matrix or on its surface.

Citation Download Citation

Rodney R. Agayan, Thomas Horvath, Brandon H. McNaughton, Jeffrey N. Anker, and Raoul Kopelman "Optical manipulation of metal-silica hybrid nanoparticles", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); https://doi.org/10.1117/12.559757

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