Observation of Normal-Incidence Intersubband Absorption in n-Type Al sub 0.09 Gasub 0.91 Sb Quantum Wells. (Reannouncement with New Availability Information)

摘要

Normal-incidence intersubband absorption has been observed in n-type Al sub0.09Ga sub 0.91 Sb quantum wells, as predicted by our previous calculation. The quantum wells were grown on (100)-GaSb and (100)-GaAs substrates and contain an electron sheet density of approximately 7 x 10(11) cm(-2). The electrons occupy a two-dimensional L-point subband having ellipsoidal Fermi surfaces. For 7.0-nm-wide quantum wells, the absorption peak occurs at 870 cm(-1) (11.5 micron m), the peak fractional absorption per quantum well is 0.06%, and the full width at half maximum of the absorption profile is 30 meV. The measured absorption strength is within 12% of the theoretical calculation, which was based on the effective-mass method....Quantum well, Intersubband, Transition, Infrared detection, Ellipsoidal valleys.