Title :
Acoustooptic modulator using the Stark effect and stress-induced bandgap changes
Author :
Gryba, Tadeusz ; Gazalet, Joseph ; Lrfebvre, J.-E. ; Sainte-Rose, Frédéric ; Zhang, Victor Y. ; Sadaune, Véronique
Author_Institution :
Dept. Opto-Acousto-Electron., Valenciennes Univ., France
fDate :
2/1/1999 12:00:00 AM
Abstract :
An analysis of the semiconductor multiple-quantum-well (MQW) acoustooptic modulator is performed. The strain and electric-field components generated by surface acoustic waves (SAW´s) in a multilayered semiconductor piezoelectric structure are presented. The effects of a SAW propagation on the modulator optical parameters are studied. Two kinds of SAW effects in the modulator structure are taken into account: the variation of the excitonic energies of the MQW due to strain and the companion electric field generated by the SAW is determined. The hole´s effective mass change induced by the SAW is analyzed and included in the Schrodinger equation. The optical absorption coefficient spectra of the modulator as a function of the SAW power is presented. Experimental results concerning optical absorption variations of quantum-well structures produced by various SAW powers are shown
Keywords :
Schrodinger equation; Stark effect; absorption coefficients; effective mass; quantum well devices; semiconductor quantum wells; surface acoustic wave devices; SAW; SAW power; SAW propagation; Schrodinger equation; Stark effect; acoustooptic modulator; companion electric field; effective mass change; electric-field components; excitonic energies; modulator optical parameters; modulator structure; multilayered semiconductor piezoelectric structure; optical absorption; optical absorption coefficient spectra; quantum-well structures; semiconductor MQW acoustooptic modulator; semiconductor multiple-quantum-well acoustooptic modulator; strain components; stress-induced bandgap changes; surface acoustic waves; Absorption; Acoustic propagation; Acoustic waves; Capacitive sensors; Optical modulation; Optical surface waves; Performance analysis; Quantum well devices; Stark effect; Surface acoustic waves;
Journal_Title :
Quantum Electronics, IEEE Journal of
