INFRARED OPTICAL ABSORPTIONS IN CORRUGATED LATERAL SURFACE SUPERLATTICES

The optical properties are investigated numerically in infrared (IR) r egions for GaAs/AlAs corrugated lateral surface superlattices (CLSSLs) with short lateral periods. The calculations are carried out for refr active indexes and optical absorption coefficients with and without in clusion of electron interactions in an attempt to study the effects of intersubband plasmons on the IR optical properties of CLSSLs. As late ral periods of CLSSLs increase from 10 nm to 30 nm, their IR optical p roperties change from the behavior dominated by single electron transi tions between conduction subbands to those dominated by intersubband p lasmon excitations. Strong and sharp peaks in the optical absorption c oefficients, large variations of the refractive indexes and strong ani sotropic optical properties of CLSSLs are predicted in IR regions.