Berlin 2015 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 6: Poster Session DF
DF 6.7: Poster
Montag, 16. März 2015, 19:00–21:00, Poster C
Phonon modes in thin-film lithium niobate: A basic study — •Sebastian Krehs1, Kai Spychala1, Michael Rüsing1, Hui Hu3,4, Gerhard Berth1,2, and Artur Zrenner1,2 — 1Department Physik, Universität Paderborn, 33098 Paderborn, Germany — 2Center for Optoelectronics (CeOPP), 33098 Paderborn, Germany — 3School of Physics, Shandong University, Jinan 250100, China — 4Nanoln Co. Ltd., Shunhua Road 750, Jinan 250100, China
In the recent years ferroelectric thin films have attracted much attention due to the large quantity of possible applications like infrared detectors and optical filters. For further advancement a better understanding of its physical properties will be inevitable. Therefore the vibrational fingerprints of thin-film lithium niobate (LiNbO3) were studied via µ-Raman spectroscopy. The main focus of the work was concentrated on classification of the occurring vibrational modes in thin-film LiNbO3 with respect to the crystallographic orientation. Here we found a congruent phonon-mode signature to bulk crystal which permits us to conclude that the realized thin-films are of good crystalline quality. Due to the specific fabrication process of thin-film layers, the realized thin-films were attached to different kinds of interface layers. In this context we studied in a further step the influence of different interface layers (e.g. Si- or Cr-layer) on the vibrational properties of thin-film LiNbO3. Furthermore an angle-dispersive characterization was utilized for a defined classification of emerging vibrational modes and a verification of mode-coupling respectively. Here differences could be found which might be linked to surface related effects.