Nonlinear Diffuse fs-Pulse Reflectometry of Harmonic Upconversion Nanoparticles
by
Christian Kijatkin 1, Juliane Eggert 1, Sergej Bock 1,2, Dirk Berben 2, Laura Oláh 3, Zsuzsanna Szaller 3
, Zsolt Kis 3 and Mirco Imlau 1,*
Christian Kijatkin 1, Juliane Eggert 1, Sergej Bock 1,2, Dirk Berben 2, Laura Oláh 3, Zsuzsanna Szaller 3, Zsolt Kis 3 and Mirco Imlau 1,*
1
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
2
Department of Electrical Engineering and Information Technology, South Westphalia University of Applied Sciences, Haldener Str. 182, 58095 Hagen, Germany
3
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.
Photonics 2017, 4(1), 11; https://doi.org/10.3390/photonics4010011
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)
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.
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Keywords:
nonlinear spectroscopy; diffuse reflectometry; upconversion nanoparticles; harmonic nanoparticles; LiNbO3; TiO2; SHG; THG; polarity
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MDPI and ACS Style
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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