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- Title
Voltage-tunable dual-colour quantum Bragg mirror detector (QBMD).
- Authors
Penello, Germano M.; Pereira, Pedro H.; Sousa, Vitor B.; Kawabata, Rudy M. S.; Pires, Mauricio P.; Souza, Patricia L.
- Abstract
The electronic quasi-bound state in the continuum concept is explored in an InGaAs/InAlAs heterostructure to create a voltage-tunable dual-colour quantum Bragg mirror detector. This heterostructure is based on one main quantum well embedded between two different superlattices. By bandgap engineering, each superlattice gives rise to quasi-bound states in the continuum with a preferential direction for electron extraction. Due to these states, the photovoltaic photocurrent presents a dual-colour response, one in a positive direction at 340 meV (3.6 μm), and one in a negative direction at 430 meV (2.9 μm). The simultaneous dual-colour detection can be switched to a single-colour detection (340 meV or 430 meV) by applying a bias voltage. At 77 K, the specific detectivity for simultaneous dual-colour is 2.5·108 Jones, while the single-colour detectivities are 2.6·109 Jones at +2.0 V and 7.7·108 Jones at -1.6 V for 340 meV and 430 meV, respectively.
- Subjects
BOUND states; HETEROSTRUCTURES; SUPERLATTICES; BAND gaps; QUANTUM wells; PHOTOCURRENTS
- Publication
Opto-Electronics Review, 2023, Vol 31, p1
- ISSN
1230-3402
- Publication type
Article
- DOI
10.24425/opelre.2023.144559