Tunable intense source at sub-THz frequencies and its nonlinear interaction in condensed matter
Bibliographic record
Abstract
Photoconductive antennas are at the forefront of THz source technology, and the Large-Aperture Photoconductive Antenna (LAPCA) can generate intense THz pulses with peak fields surpassing 100 kV/cm. Despite the unique properties of these generated THz pulses—such as high THz field asymmetry, low central frequency around 100 GHz, and a significant ponderomotive potential—the widespread adoption of LAPCAs has been hindered by limitations in peak intensity and their fragility. In this paper, we discuss recent advancements in wide bandgap semiconductor LAPCAs featuring an interdigitated structure, facilitating the shaping of intense THz pulses with various waveforms, ranging from asymmetric quasi-half-cycle to symmetric single-cycle pulses and allowing for tunable polarization. Additionally, we explore the nonlinear interaction of these pulses with an n-doped InGaAs thin film, where we report, for the first time, high-frequency generation.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".