Broadband terahertz generation near the reststrahlen band in LiNbO3 waveguides

B. N. Carnio; A. Y. Elezzabi

doi:10.1117/12.2507947

1 March 2019 Broadband terahertz generation near the reststrahlen band in LiNbO₃ waveguides

B. N. Carnio, A. Y. Elezzabi

Proceedings Volume 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII; 109170U (2019) https://doi.org/10.1117/12.2507947
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Waveguides having a lithium niobate (LiNbO₃) core are investigated for the generation of terahertz (THz) radiation, where second-order nonlinear susceptibility enhancement is utilized to produce the THz radiation via optical rectification. Although reststrahlen band losses are high in the vicinity where the nonlinear susceptibility exhibits enhancement, these losses are avoided by restricting the core to have sub-micron dimensions, thus allowing the generated THz radiation to propagate along the guide with >90% of its intensity outside the lossy LiNbO₃ core. The generated radiation exhibits a spectral distribution having a central frequency of 5.6 THz and a full-width half maximum bandwidth of 1.3 THz. The THz electric field pulse has an amplitude of 2 kV/cm and is produced at the conversion efficiency of 0.025%.

Citation Download Citation

B. N. Carnio and A. Y. Elezzabi "Broadband terahertz generation near the reststrahlen band in LiNbO₃ waveguides", Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109170U (1 March 2019); https://doi.org/10.1117/12.2507947

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