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Modeled (solid line) and (dashed line) conduction band edge profile of the sample showing the relative positions of the calculated Fermi level (dashed dot line) and the subband energy levels.
Photoluminescence spectrum at 300 K.
Intersubband absorption measured at 300 K using 45° waveguide geometry (thick line) and Lorentzian curve fit (thin line).
(a) Photoresponse at zero bias as a function of temperature and (b) the photoresponse at 270 K (thick line) and signal without illumination (thin line) on an expanded scale.
Photoresponse at for various values of external negative bias.
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