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(a) A sketch represents the multiple quantum dot structures investigated and (b) schematics of the bound states in the quantum dots are shown as and .
Optical absorption spectra, measured at , are plotted for intersubband transition in the multiple quantum dots grown with a different number of monolayers. The theoretical curves (dashed lines) obtained from convoluting Eq. (2) with either a Lorentzian line shape for bound-to-bound transitions or Eq. (3) for bound-to-continuum transitions. The spectra were displaced vertically for clarity.
The peak position energy (wave number) converted to wavelength (second axis) measured at and plotted as a function of the number of monolayers of . The solid line is drawn to guide the eye.
The integrated areas of the intersubband transitions measured at and plotted as a function of the number of monolayers of . The solid line is drawn to guide the eye.
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