Title :
Theoretical analysis of laterally emitting terahertz-wave generation by difference-frequency generation in channel waveguides
Author :
Suhara, Toshiaki ; Avetisyan, Yuri ; Ito, Hiromasa
Author_Institution :
Dept. of Electron., Osaka Univ., Japan
fDate :
1/1/2003 12:00:00 AM
Abstract :
Theoretical analysis of top- and side-emitting terahertz-wave generation by difference frequency generation in LiNbO3 channel waveguides with domain-inverted grating is presented. The analysis is based on Green´s function and plane-wave expansion approaches. Mathematical expressions and numerical data for the conversion efficiency and the directionality were obtained. The results are consistent with those using two-dimensional model, but are more accurate and apply for various realistic device configurations. It was shown that higher efficiencies can be accomplished with narrow channel guides, although the radiation is highly divergent.
Keywords :
Green´s function methods; diffraction gratings; lithium compounds; microwave photonics; optical frequency conversion; optical waveguide theory; optical waveguides; Green´s function; LiNbO3; LiNbO3 channel waveguides; channel waveguides; conversion efficiency; device configurations; difference-frequency generation; directionality; domain-inverted grating; highly divergent radiation; laterally emitting terahertz-wave generation; narrow channel guides; plane-wave expansion approaches; side-emitting terahertz-wave generation; top-emitting terahertz-wave generation; Crystals; Gratings; Indium tin oxide; Microwave communication; Nonlinear optical devices; Nonlinear optics; Optical frequency conversion; Optical waveguides; Optical wavelength conversion; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2002.806198
