Plasmon-enhanced optical trapping of individual metal nanorods

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66441C.pdf (1.71 MB)

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https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6644/66441C/Plasmon-enhanced-optical-trapping-of-individual-metal-nanorods/10.1117/12.741857.short

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https://doi.org/10.1117/12.741857
 http://hdl.handle.net/11603/29224

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UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0002-6370-8765

Date

2007-09-05

Type of Work

conference papers and proceedings
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Citation of Original Publication

Matthew Pelton, Mingzhao Liu, Kimani C. Toussaint Jr., Hee Y. Kim, Glenna Smith, Jelena Pesic, Philippe Guyot-Sionnest, Norbert F. Scherer, "Plasmon-enhanced optical trapping of individual metal nanorods," Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66441C (5 September 2007); https://doi.org/10.1117/12.741857

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

We demonstrate three-dimensional optical trapping and orientation of individual Au nanorods, Au/Ag core/shell nanorods, and Au bipyramids in solution, using the longitudinal surface-plasmon resonance to enhance optical forces. Laser light that is detuned slightly to the long-wavelength side of the resonance traps individual and multiple particles for up to 20 minutes; by contrast, light detuned to the short-wavelength side repels rods from the laser focus. Under stable-trapping conditions, the trapping time of individual particles depends exponentially on laser power, in agreement with a Kramers escape process. Trapped particles have their long axes aligned with the trapping-laser polarization, as evidenced by a suppression of rotational diffusion about the short axis. When multiple particles are trapped simultaneously, evidence of interparticle interactions is observed, including a nonlinearly increasing two-photon fluorescence intensity, increasing fluorescence fluctuations, and changing fluorescence profiles as the trapped particle number increases.