Regensburg 2016 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 3: Optical and nonlinear optical properties, photonic
DF 3.6: Vortrag
Montag, 7. März 2016, 11:30–11:50, H26
Nonlinear optical spectroscopy of niobate nanopowders — •Christian Kijatkin1, Anke Duettmann1,2, Karsten Koempe2, Laura Olah3, Eva Tichy-Racs3, Zsuzsanna Szaller3, and Mirco Imlau1 — 1School of Physics, Osnabrück University, Germany — 2Institute of Chemistry of New Materials, Osnabrück University, Germany — 3Wigner Research Centre for Physics, Budapest, Hungary
Nonlinear optical (NLO) nanocrystals (NCs) excel in a wide spectrum of applications, most notably as optical probes in high-resolution microscopy. This field has incited a multitude of NLO characterization approaches with the ultimate goal of providing comprehensive analysis of NCs. The plethora of available NLO materials in conjunction with different measurement techniques raises the question of comparability. A peculiar case is frequency-doubling which may be attributed to surface- or volume-second harmonic generation (SHG) as well as Hyper-Rayleigh scattering or higher-order multipole contributions. Extensive studies have been performed with little interconnections to each other. We present the results of our examinations on the individual NLO contributions arising from their respective origins by assessing the SHG behavior of niobate nanopowders (NaNbO3, LiNbO3:Yb). Transmittive and reflective techniques are performed to elucidate intensity and dispersion relation. In combination with linear diffuse reflectance scans, a prospective method of comparing NLO investigations is introduced. Financial support (DFG INST 190/165-1 FUGG, DAAD 57139940) is gratefully acknowledged.