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Updated: Apr 13, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Observation of a Fano Resonance at 92 meV (13.5 µm) in Al0.2Ga0.8N/GaN-Based Quantum Cascade Emitters
Daniel Hofstetter1, Andreas D Wieck2, Hans Beck3
1Independent Researcher, Chemin du Château 5, 2068 Hauterive, Switzerland.
Abstract:
We report on asymmetrically shaped Fano resonances in Al0.2Ga0.8N/GaN-based quantum cascade structures. In order to observe this type of resonance in electro-luminescence, a spectrally narrow feature must interact with a broad, quasi-continuous emission. While the narrow waveform is provided by the GaN-based LO-phonon at 92 meV (13.5 µm, 741 cm-1), the broad peak consists of overlapping inter-subband transitions between several higher-order excited states ranging from 80 to 300 meV and the ground state. Through the interference of these spectrally dissimilar peaks, a typical, asymmetric Fano line shape is generated.
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