Ultralow threshold electrically injected AlGaN nanowire ultraviolet lasers on Si
Bibliographic record
Abstract
Ultraviolet (UV) lasers are of paramount importance for applications in water purification, diagnosis and bio-agent detection. Here we report that, with the use of dislocation-free AlGaN nanowires formed directly on Si substrate, electrically injected UV emission in the wavelength range from 319 nm to 335 nm can be readily achieved, which is the shortest wavelength range ever reported for electrically injected semiconductor lasers. In this work, catalyst-free AlGaN nanowire arrays are grown directly on Si substrate by radio frequency plasma-assisted molecular beam epitaxy (MBE). Our detailed calculation shows that such vertically aligned randomly distributed sub-wavelength scale nanowire array can sustain random lasing action. Various lasing peaks from 319 nm to 335 nm can be measured from such AlGaN nanowire samples under electrical injection. The threshold is measured to be in the range of tens of A/cm<sup>2</sup> at cryogenic temperature, which is significantly smaller than the commonly reported GaN-based quantum well lasers. The measured linewidth is as narrow as 0.2 nm.
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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 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".