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(a) Cross-sectional TEM image of the QW sample used in this work. (b) Room-temperature ISB absorbance spectrum of the same sample. The negative dip in the spectrum near 1300 nm is an artifact of the system response and is not related to the optical properties of the sample. The inset shows the calculated conduction-band lineup and squared envelope functions of the three lowest bound states (referenced to their respective energy levels) of one QW in the active region.
Emission spectra measured with a TM-polarized pump wave at 910 nm (dotted lines), and modified-Gaussian fits of the experimental data (solid lines). The spectra in (a) and (b) were measured at two different places in the QW sample.
Emission spectra obtained under various excitation conditions. (a) Luminescence spectra measured with otherwise identical TM- (circles) and TE- (squares) polarized pump waves. (b) Luminescence spectra measured with the same pump wave and passed through a polarizer with transmission axis oriented along the TM (circles) and TE (squares) directions. (c) Dependence of the emission spectrum on the pump wavelength for . (c) Dependence of the emission spectrum on the pump wavelength for . In (c) and (d) the spectra are shifted relative to one another vertically for the sake of illustration clarity.
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