Rayleigh scattering correlation spectroscopy on diffusion dynamics of nanoparticles under intense laser irradiation

Ping-Yu Hee; Takayuki Uwada; Kazunori Okano; Atsushi Miura; Hiroshi Masuhara

doi:10.1117/12.2023022

12 September 2013 Rayleigh scattering correlation spectroscopy on diffusion dynamics of nanoparticles under intense laser irradiation

Ping-Yu Hee, Takayuki Uwada, Kazunori Okano, Atsushi Miura, Hiroshi Masuhara

Author Affiliations +

Proceedings Volume 8810, Optical Trapping and Optical Micromanipulation X; 88102T (2013) https://doi.org/10.1117/12.2023022
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

Rayleigh scattering correlation microspectroscopy is developed and applied to study diffusion dynamics of some nanospheres in water. It was clearly found that the diffusion constant of gold nanoparticles decreased with increasing excitation laser power at the excitation wavelength of higher absorption cross section. This behavior was explained in terms of a coupling between laser trapping by the scattering excitation laser itself and laser heating of the particle. In the case of non-absorbing nanospheres such as silica and polystyrene, the excitation power dependence can be ascribed only to the laser trapping. Experimental setup is introduced, theoretical formulation is described, and future development of this measurement is considered.

Citation Download Citation

Ping-Yu Hee, Takayuki Uwada, Kazunori Okano, Atsushi Miura, and Hiroshi Masuhara "Rayleigh scattering correlation spectroscopy on diffusion dynamics of nanoparticles under intense laser irradiation", Proc. SPIE 8810, Optical Trapping and Optical Micromanipulation X, 88102T (12 September 2013); https://doi.org/10.1117/12.2023022

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