Dresden 2020 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Postersession KFM
KFM 15.15: Poster
Donnerstag, 19. März 2020, 16:00–18:30, P2/1OG
Raman micro-spectroscopy of x-cut thin film lithium niobate periodically poled with high fidelity for integrated optics — •Sven Reitzig1, Michael Rüsing1, Benjamin Kirbus1, Joshua Gössel1, Zeeshan Amber1, Jie Zhao2, Shayan Mookherjea2, and Lukas Eng1 — 1Institut für Angewandte Physik, Technische Universität Dresden, Nöthnitzer Str. 61, 01187 Dresden, Germany — 2University of California, San Diego, 9500 Gilman Dr, La Jolla, CA-92093-0407, USA
Periodically poled thin film lithium niobate (TFLN) promises high performance for integrated nonlinear and quantum optics. Aside the long poling lengths, a homogenous domain duty cycle is desired in order to achieve high nonlinear conversion efficiencies and narrow band-spectra. However, most works are lacking reliable imaging techniques that allow assessing the homogeneity of poling over both larger structure sizes and within individual domains. [1,2] Complementing recent SHG microscopy investigations [3], we apply here Raman micro-spectroscopy to inspect the domain formation in TFLN. By carefully analyzing the E(TO) and A1(TO) phonon modes, we are able to map intriguing material properties such as internal electric fields that show distinct variations between poled domains and domain walls. Raman spectroscopy hence provides unique domain analysis possibilities as needed for device fabrication with improved integrated nonlinear optical characteristics.
[1] A. Rao et al., OE 27, 25920 (2019). [2] L. Chang et al., Optica 3, 531 (2016). [3] M. Rüsing et al., JAP 126, 114105 (2019).