Engineering Photonic Crystal Impurity Bands for Waveguides, All-Optical Switches and Optical Delay Lines(Special Issue on Ultrafast Optical Signal Processing and Its Application)

概要

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We investigate the engineering of the impurity bands in photonic crystals (PCs) for realizing high-efficiency wave guiding, all-optical switching and optical delay for ultrashort optical pulses. It is found that quasi-flat impurity bands suitable for the transmission of ultrashort pulses can be achieved by properly controlling the configuration of coupled cavity waveguides (CCWs). At sharp corners, high bending efficiency is obtained over the entire impurity band. All-optical switching can be realized by creating a dynamical band gap at the center of an impurity band. The concentration of electromagnetic wave at defect regions leads to high switching efficiency while the tunable feature of PC defects makes all-optical control possible. It is also revealed that CCWs with quasi-flat impurity bands provide efficient group delay for nlt rashort pulses with negligible attenuation and distortion. From the viewpoint of practical fabrication, the effect of disdrder on the transmission property of impurity bands is discussed and the criterion for localization transition is determined.
社団法人電子情報通信学会の論文
2002-01-01