Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters
We report on asymmetrically shaped Fano resonances in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/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....
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/2072-666X/16/7/787 |
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| author | Daniel Hofstetter Andreas D. Wieck Hans Beck David P. Bour |
| author_facet | Daniel Hofstetter Andreas D. Wieck Hans Beck David P. Bour |
| author_sort | Daniel Hofstetter |
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| description | We report on asymmetrically shaped Fano resonances in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/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<sup>−1</sup>), 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. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-06-01 |
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| spelling | doaj-art-d4fc6b137ccb4761b17995629d06da2d2025-08-20T03:36:12ZengMDPI AGMicromachines2072-666X2025-06-0116778710.3390/mi16070787Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade EmittersDaniel Hofstetter0Andreas D. Wieck1Hans Beck2David P. Bour3Independent Researcher, Chemin du Château 5, 2068 Hauterive, SwitzerlandLehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, GermanyIndependent Researcher, Rue des Peupliers 6, 2014 Bôle, SwitzerlandGoogle LLC, 1250 Reliance Way, Fremont, CA 94539, USAWe report on asymmetrically shaped Fano resonances in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/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<sup>−1</sup>), 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.https://www.mdpi.com/2072-666X/16/7/787Fano resonanceAl<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN structurequantum-cascade emitterLO-phonon energyinter-subband transition |
| spellingShingle | Daniel Hofstetter Andreas D. Wieck Hans Beck David P. Bour Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters Micromachines Fano resonance Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN structure quantum-cascade emitter LO-phonon energy inter-subband transition |
| title | Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters |
| title_full | Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters |
| title_fullStr | Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters |
| title_full_unstemmed | Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters |
| title_short | Observation of a Fano Resonance at 92 meV (13.5 µm) in Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN-Based Quantum Cascade Emitters |
| title_sort | observation of a fano resonance at 92 mev 13 5 µm in al sub 0 2 sub ga sub 0 8 sub n gan based quantum cascade emitters |
| topic | Fano resonance Al<sub>0.2</sub>Ga<sub>0.8</sub>N/GaN structure quantum-cascade emitter LO-phonon energy inter-subband transition |
| url | https://www.mdpi.com/2072-666X/16/7/787 |
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