Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.42: Poster

Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik

Domain structure sensitive phonon modes in PPKTP waveguides — •Julian Brockmeier, Christof Eigner, Laura Padberg, Peter Mackwitz, Christine Silberhorn, Gerhard Berth, and Artur Zrenner — Department Physik, Universität Paderborn, 33098 Paderborn, Germany

Periodically poled Potassium Titanyl Phosphate (KTP) is highly interesting for quantum optical applications. However, there are many challenges regarding the fabrication of periodically poled waveguide structures for domain periods in the submicron regime. Therefore a fundamental understanding of the underlying physics of the domain inversion process in such materials is necessary. Here, Raman spectroscopy presents a powerful method to uncover various material properties like stoichiometry, strain or ferroelectricity.

In this work the phonon modes for different scattering geometries are fully characterized by confocal Raman spectroscopy. Here the sensitivity of the vibrations linked to the ferroelectric domain structure in bulk and the rubidium indiffused KTP are studied. In this context the local material properties are expressed by variations of mode intensity, FWHM and center frequency. In our study we found specific modes with different vibrational signatures in the vicinity of domain boundaries and within the rubidium exchanged area. Further we perform Raman imaging on different structures in KTP based on our sensitivity analysis resulting in images with different content of characteristic material features.