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Clustering of optically trapped large diameter plasmonic gold nanoparticles by laser beam of hybrid-TEM11* mode

J. Nanophoton. 5, 053511 (Jun 24, 2011); http://dx.doi.org/10.1117/1.3600647

Ranjeet Kumar, Dalip Singh Mehta, and Chandra Shakher

Indian Institute of Technology Delhi, Laser Applications and Holography Laboratory, Instrument Design Development Centre, Hauz Khas, New Delhi – 110016, India

Multiple trapping and clustering of gold nanoparticles (Au-NPs) of 254- and 150-nm diameter was affected using optical tweezers near the plasmon excitation wavelength. To ensure that the gradient force exceeded the sum of multiply-enhanced destabilizing absorption and scattering forces originating from plasmon excitation, embedded intensity gradient regions of a spatially featured asymmetric (SFA) laser beam were exploited. Thus, an intra-cavity generated SFA beam, also referred as hybrid TEM11* mode, is an intermediate between pure TEM00 and TEM11 beams and was directly obtained from a diode-pumped solid state (Nd:YAG) laser resonator without introducing any external beam modulation devices. The parabolic Gaussian-ray model of a tightly focused laser beam was adopted to evaluate the radiation forces including the volume-correction factor raised from fractional polarization of such large diameter Au-NPs under laser illumination. Temperature rise of Au-NPs and its dissipation profile in surrounding medium has also been presented. This multiple trapping and clustering of Au-NPs at plasmon excitation wavelength using sufficiently low power could be realized due to embedded intensity gradients of the SFA beam. The study might be useful for understanding the light-matter interaction, improving the sensitivity of diagnostics, and safety and efficacy of therapeutic nanotechnologies in medicine, photothermolysis, and surface-enhanced Raman spectroscopy, etc.

© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

History
Received Sep 07, 2010
Accepted May 19, 2011
Revised May 09, 2011
Published online Jun 24, 2011
Citation
Ranjeet Kumar, Dalip Singh Mehta and Chandra Shakher, "Clustering of optically trapped large diameter plasmonic gold nanoparticles by laser beam of hybrid-TEM11* mode", J. Nanophoton. 5, 053511 (Jun 24, 2011); http://dx.doi.org/10.1117/1.3600647

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