Ultra-broad generation of terahertz radiation from sub-wavelength lithium niobate waveguides

B. N. Carnio; A. Y. Elezzabi

doi:10.1117/12.2290701

23 February 2018 Ultra-broad generation of terahertz radiation from sub-wavelength lithium niobate waveguides

B. N. Carnio, A. Y. Elezzabi

Proceedings Volume 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI; 1053103 (2018) https://doi.org/10.1117/12.2290701
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Terahertz (THz) electric field pulses containing frequency components across an ultra-wide spectrum are important for spectroscopy investigations, and are valuable to improving the application of THz radiation to the security, medical, and communication industries. We perform 2D finite-difference time-domain simulations of sub-wavelength LiNbO₃ (LN) waveguides (i.e. waveguides having core dimensions that are sub-wavelength with respect to the femtosecond optical pump pulse). The sub-wavelength aspect of these waveguiding structures maximizes the intensity of the pump pulse in the LN core, while also minimizing the LN reststrahlen band absorption. Notably, Cherenkov radiation is generated at frequencies between 0.18 and 106 THz, where the sub-wavelength nature of the waveguides allows for Cherenkov emission at ~47° over the entire frequency spectrum. Additionally, we show how a 100 μm×1 mm×500 nm waveguide (pumped by a 780 nm, 7 fs, 1 nJ femtosecond pulse) produces a 140 fJ THz electric field pulse.

Citation Download Citation

B. N. Carnio and A. Y. Elezzabi "Ultra-broad generation of terahertz radiation from sub-wavelength lithium niobate waveguides", Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 1053103 (23 February 2018); https://doi.org/10.1117/12.2290701

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KEYWORDS

Terahertz radiation

Waveguides

Femtosecond phenomena

Data modeling

Absorption

Silicon

Refractive index

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