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(a) FTIR transmission spectra at room temperature of a sample with a nominal well width of 7.6 nm using TM- and TE-polarized light. (b) ISB absorption spectrum of the same sample, obtained by taking the negative natural logarithm of the ratio .
Normalized ISB absorption spectra at room temperature of the five samples with nominal well widths of 4.5, 6, 7.6, 9.6, and 12 nm (open circles: experimental data; solid lines: fits). The arrow indicates the direction in which the well width increases.
Well width dependence of the ISB transition energy for a InGaAs/GaAsSb QW. The filled circles indicate the experimental values of the ISB resonances, while the solid line is the calculation. Inset: schematic of the conduction band with the moduli squared of the wave functions of the levels which are involved in the ISB absorption process. The CBO is also indicated.
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