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Characterization of the three-well active region of a quantum cascade laser using contactless electroreflectance
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Image of FIG. 1.
FIG. 1.

Layer diagrams of the 3ACQW test structure and the QC laser structure. Notice that both structures share the same active region.

Image of FIG. 2.
FIG. 2.

(Color online) TMM calculation results for the electrons in the conduction band (positive values) and the holes in the valence band (negative values) of the 3ACQW test structure, with a value of zero assigned to the top of the valence band of the quantum wells. Only the heavy hole values are plotted. Also plotted are the moduli square of the electronic wavefunctions obtained from the TMM analysis.

Image of FIG. 3.
FIG. 3.

High resolution x-ray diffraction scans of the 3ACQW test structure (a), and the QC laser structure (b). The satellite peaks due to the superlattice structure are marked with lines. The zero order peak of the superlattice [SL(0)] is identified by an arrow.

Image of FIG. 4.
FIG. 4.

Top: experimental room temperature CER spectrum (solid line) superimposed with a dash line corresponding to the fit. The arrows indicate the transitions obtained by the fit. The assignments are based on the TMManalysis. Bottom: room temperature photoluminescence spectra of a ZnCdSe calibration sample (a) and ZnCdMgSe calibration sample (b), and the 3ACQW test structure (c).

Image of FIG. 5.
FIG. 5.

FTIR absorption spectrum of the QC laser structure (solid line) measured at room temperature. Lorentzian fits to the curve are shown below the curve (dashed lines). The corresponding ISB transitions were identified based on the analysis of the 3ACQW test structure.


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Transfer matrix method results for the numerical values of the energies of the bound states in the 3ACQW test structure. All the energies are measured relative to the top of the well (ZnCdSe) valence band, which is set at zero.

Generic image for table

Summary of the experimental CER fit results, PL measurements, and the calculated TMM energy values for the assigned transition. The last column is the difference between the CER experimental value and the TMM calculation result.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterization of the three-well active region of a quantum cascade laser using contactless electroreflectance