Abstract
We design an AlGaAs-based terahertz photonic crystal waveguide (PCW) to achieve
terahertz-wave difference frequency generation (DFG) from near-infrared light sources.
The PCW structure provides a tight confinement of terahertz-wave field, resulting in a
good mode field overlap of three waves. The unique phase matching condition between two
pump waves and terahertz Bloch wave can be satisfied through choosing appropriate
waveguide parameters and pump wavelengths. With the coupled-mode equations derived from
modal theory for describing the light propagation, we simulate the continuous terahertz
DFG process, and a high power-normalized conversion efficiency of 0.7632 ×
10<sup>-4</sup> W<sup>-1</sup> for 3 THz generation is obtained.
© 2012 IEEE
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