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WEB Raman micro-spectroscopy of thin film lithium niobate periodically poled with high fidelity for integrated optics

Tuesday (22.09.2020)
10:40 - 10:55 F: Functional Materials, Surfaces, and Devices 2
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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 x-cut 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.

Sven Reitzig
TU Dresden
Additional Authors:
  • Jie Zhao
    UC San Diego
  • Dr. Michael Rüsing
    TU Dresden
  • Benjamin Kirbus
    TU Dresden
  • Joshua Gössel
    TU Dresden
  • Prof. Shayan Mookherjea
    UC San Diego
  • Prof. Dr. Lukas M. Eng
    TU Dresden