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Photonics 2017, 4(1), 11; doi:10.3390/photonics4010011

Nonlinear Diffuse fs-Pulse Reflectometry of Harmonic Upconversion Nanoparticles

School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
Department of Electrical Engineering and Information Technology, South Westphalia University of Applied Sciences, Haldener Str. 182, 58095 Hagen, Germany
Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Konkoly-Thege u. 29-33, 1121 Budapest, Hungary
Author to whom correspondence should be addressed.
Received: 14 December 2016 / Revised: 10 February 2017 / Accepted: 16 February 2017 / Published: 19 February 2017
(This article belongs to the Special Issue Ultrafast Photonics and Attosecond Sciences)
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Nonlinear diffuse femtosecond-pulse reflectometry is introduced as a powerful experimental tool for the unambiguous characterization of polar and non-polar point symmetry groups of harmonic upconversion nanoparticles. Using intense ultrashort 40 femtosecond laser pulses and an appropriate figure of merit (FOM), second and third harmonic emission serve for the structural characterization of polar Yb-doped lithium niobate and non-polar titanium dioxide nanoparticles. The tool is capable of differentiating these two samples by FOM values that differ by up to 13 orders of magnitude. The general applicability to harmonic upconversion nanoparticles over a broad range of intensities and wavelength spectrum, is discussed. View Full-Text
Keywords: nonlinear spectroscopy; diffuse reflectometry; upconversion nanoparticles; harmonic nanoparticles; LiNbO3; TiO2; SHG; THG; polarity nonlinear spectroscopy; diffuse reflectometry; upconversion nanoparticles; harmonic nanoparticles; LiNbO3; TiO2; SHG; THG; polarity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kijatkin, C.; Eggert, J.; Bock, S.; Berben, D.; Oláh, L.; Szaller, Z.; Kis, Z.; Imlau, M. Nonlinear Diffuse fs-Pulse Reflectometry of Harmonic Upconversion Nanoparticles. Photonics 2017, 4, 11.

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