Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 30, Issue 13, Pages 2156-2162Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2012.2192908
Keywords
Difference frequency generation (DFG); photonic crystal waveguides (PCWs); semiconductors; terahertz wave
Funding
- National Natural Science Foundations of China [60977044, 11105049]
- Natural Science Foundation of Hubei Province [2011CDC010]
- Foundation for Youths of Hubei Normal University [2010C22]
- Hubei Province Science Foundation for Youths [Q20112501]
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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 x 10(-4) W-1 for 3 THz generation is obtained.
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