SKM 2021 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Poster Session KFM
KFM 5.19: Poster
Dienstag, 28. September 2021, 16:00–17:00, P
Second-harmonic microscopy in optically confining nanostructures — •Zeeshan Hussain Amber1, Benjamin Kirbus1, Michael Rüsing1, and Lukas M Eng1,2 — 1Technische Universität Dresden, Germany — 2ct.qmat: Dresden-Würzburg Cluster of Excellence EXC 2147, TU Dresden, 01062, Dresden, Germany
Second-harmonic (SH) microscopy is a very power tool for investigating material properties and noninvasively visualising domains and domain walls in ferroelectic materials [1,2]. Contrary to the conventional assumption when working with a confining structure such as a thin film, the co-propagating phase matched SH signal may also be detected in back-reflection. Interference effects further affect the SH response. Therefore understanding the effects of geometrical confinement is necessary.
We performed SH experiments on wedge-shaped samples of 5% Mg-doped congruent Lithium tantalate, un-polled & Periodically polled Lithium niobate and compared them with full-vectorial numerical calculations of the SH process [1,3]. We found that the coherent interaction length obtained from the back-reflected SH signal is that of co-propagating phase matched signal. The excellent agreement between the simulated and experimental data confirms that co-propagating signal is detected in back-reflection geometry.
[1] M. Ruesing et al., J. Appl. Phys. 126,114105 (2019).
[2] S. Cherifi-Hertel et al., Nat. commun 8,15768 (2017).
[3] D. Sandkuijl et al., J. Opt. Soc. Amer. B 30, 382 (2013)