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Terahertz parametric converters by use of novel metallic–dielectric hybrid waveguides

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Abstract

We show that metallic–dielectric hybrid waveguides (i.e., nonradiative dielectric waveguides) can host several phase-matched terahertz (THz) parametric processes such as forward difference-frequency generation, backward THz parametric oscillation, forward and backward THz parametric upconversion, and THz second-harmonic generation. These waveguides can be designed in such a way that the radiation losses can be completely eliminated. Such unique waveguides can also be used to phase match new configurations or to achieve significant enhancements of the strengths for parametric interactions by eliminating the diffraction of the THz waves as well as reducing the modal indices. In backward THz parametric oscillation, the threshold pump intensity scales down with the output wavelength more dramatically than that in the bulk crystal. However, the threshold pump powers are approximately the same within a wide wavelength range.

© 2006 Optical Society of America

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