High Sensitivity Resonant Photorefractive Effect in Semi-Insulating CdZnTe/ZnTe Multiple Quantum Wells,

1992 
Abstract : Although the photorefractive sensitivity of the semiconductors is many orders of magnitude larger than the oxides, their small Pockels electro-optic coefficient has-been a serious drawback. By taking advantage of the quadratic effects near the band-edge, nonlinearity and sensitivity of semiconductor photorefractives can be dramatically improved. Recently, two-beam-coupling gain coefficients of 16.3/cm in gallium arsenides and 26.0/cm in indium phosphides have been reported near the band-edge. Quantum confinement of excitons in multiple quantum wells (MQWs) provides an additional enhancement of the resonant electro-optic nonlinearities. We have recently demonstrated how enhanced photorefractive sensitivity can be obtained in semi-insulting MQW devices. These devices were made semi-insulting through ion-implantation to provide sufficient density of traps for the photorefractive process as well as relieving the need for any pixelation.
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