Device and application of quantum well photodetectors for terahertz region
Bibliographic record
Abstract
We report on the progress of devices and applications of quantum-well photodetectors (QWIP) for the terahertz (~ 1-10 THz) spectrum region. We discuss device design and show that the device dark current can by effectively reduced by employing wider quantum barriers. We demonstrate several GaAs/AlGaAs QWIPs for different peak wavelength with background limited infrared performance (BLIP). We report experimental results on intersubband absorption spectra, measured using multi-pass waveguide geometry. We show that the experimentally measured intersubband energy levels agree excellently with the theoretical simulations, provided that many-body effects are taken into consideration, including exchange-correlation and depopulation effects. We report the results of QWIP photo-current spectra and detector responsivity. We discuss the high frequency capability of THz-QWIP and present experimental results of device time response measured using microwave rectification technique. We discuss its application in free space terahertz communication in combination with a terahertz quantum cascade laser (QCL). We discuss the terahertz to near infrared (THz-to-NIR) optical upconversion using a monolithic integration of THz GaAs/AlGaAs QWIP and NIR GaAs/AlGaAs LED, and its potential applications in terahertz imaging.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".