Abstract

The backward difference frequency generation process is used to produce narrowband terahertz radiation via modal phase-matching in a ${\rm SiO}_2 \text{-} {\rm LiNbO}_3$-air planar waveguide. The ${\rm TM}_0$ pump mode, ${\rm TE}_0$ signal mode, and ${\rm TE}_0$ or ${\rm TE}_2$ idler modes are selected to satisfy the backward difference frequency generation phase-matching condition, thus allowing narrowband (i.e., ${\lt}100 \;{\rm GHz}$ linewidth) terahertz radiation generation in the spectral range of 2.4–3.2 THz. To date, this is the first investigation of terahertz radiation generation in a waveguide via the modal phase-matched backward difference frequency generation process.

© 2020 Optical Society of America

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