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We demonstrate the use of an infrared modulated photoluminescence (PL) method based on step-scan Fourier-transform infrared spectrometer to analyze intersubband transition (ISBT) of InGaAs/InAlAs quantum cascade detector (QCD) structures. By… Click to show full abstract
We demonstrate the use of an infrared modulated photoluminescence (PL) method based on step-scan Fourier-transform infrared spectrometer to analyze intersubband transition (ISBT) of InGaAs/InAlAs quantum cascade detector (QCD) structures. By configuring oblique and parallel excitation geometries, high signal-to-noise ratio PL spectra from nearto far-infrared are measured. With support from numerical calculations based on k·p perturbation theory, the spectra is attributed to intraband and interband transitions of InGaAs/InAlAs QCD structures. Temperature evolution results show the k-dependent transitions caused by longitudinal optical phonon-assisted scattering (Fröhlich interaction) plays an important role in the ISBT. These results suggest this infrared modulated-PL method has great potential in characterizing QCD devices and conducting performance diagnostics.
Journal Title: Chinese Physics Letters
Year Published: 2023
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