Abstract
The quantum-confined Stark effect in intersublevel transitions present in quantum-dots-in-a-well (DWELL) detectors gives rise to a midIR spectral response that is dependent upon the detector's operational bias. The spectral responses resulting from different biases exhibit spectral shifts, albeit with significant spectral overlap. A postprocessing algorithm was developed by Sakoǧlu et al. that exploited this bias-dependent spectral diversity to predict the continuous and arbitrary tunability of the DWELL detector within certain limits. This paper focuses on the experimental demonstration of the DWELL-based spectral tuning algorithm. It is shown experimentally that it is possible to reconstruct the spectral content of a target electronically without using any dispersive optical elements for tuning, thereby demonstrating a DWELL-based algorithmic spectrometer. The effects of dark current, detector temperature, and bias selection on the tuning capability are also investigated experimentally.
Original language | English (US) |
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Pages (from-to) | 674-683 |
Number of pages | 10 |
Journal | IEEE Journal of Quantum Electronics |
Volume | 45 |
Issue number | 6 |
DOIs | |
State | Published - 2009 |
Keywords
- Algorithmic spectrometer
- Filtering algorithms
- IEEE
- Optical detectors
- Prediction algorithms
- Quantum dots
- Quantum-dots-in-a-well (DWELL) detectors
- Spectral sensors
- Spectral tuning
- Stark effect
- Tuning
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering