24 March 2017 Dielectric function of TiO2 nanoparticles under laser pumping
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Proceedings Volume 10336, Saratov Fall Meeting 2016: Optical Technologies in Biophysics and Medicine XVIII; 1033619 (2017) https://doi.org/10.1117/12.2267926
Event: Saratov Fall Meeting 2016: Fourth International Symposium on Optics and Biophotonics, 2016, Saratov, Russian Federation
Abstract
Non-linear properties of titania nanoparticles were studied using the closed aperture z-scanning with the simultaneous measurements of the intensity of Rayleigh scattering. Pulsed laser light at 355 nm was applied as the probe radiation. The intensity of probe beam in the waist plane of a focusing lens was varied in the range from 5⋅106 W/cm2 to 1.1⋅1011 W/cm2. Water suspensions of 25 nm titania nanoparticles were used as the studied samples. The obtained values of nonlinear extinction and scattering intensity were used to retrieve the real and imaginary parts of the effective dielectric function of nanoparticles in the dependence on the pumping intensity. It was found that the real part of the effective dielectric function becomes negative at the pumping intensities exceeding ≈ 7⋅108 W/cm2. However, the effect of resonance excitation of localized surface modes does not occur due to very high values of the imaginary part in this case.
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D. A. Zimnyakov, D. A. Zimnyakov, S. A. Yuvchenko, S. A. Yuvchenko, N. S. Markova, N. S. Markova, } "Dielectric function of TiO2 nanoparticles under laser pumping", Proc. SPIE 10336, Saratov Fall Meeting 2016: Optical Technologies in Biophysics and Medicine XVIII, 1033619 (24 March 2017); doi: 10.1117/12.2267926; https://doi.org/10.1117/12.2267926
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