Optical modulation of a photonic bandgap with two-photon excitation and the Kerr effect
Bibliographic record
Abstract
Summary form only given. We experimentally demonstrate the effect of two-photon absorption (TPA) and Kerr nonlinearity on the transmission properties of a silicon-based, one-dimensional photonic crystal. The sample under study is made of five pairs of amorphous Si/SiO/sub 2/ thin layers, with a lattice period of 645 nm. Using a pump-and-probe technique with femtosecond pulses, we monitor the photonic band edge with a weak probe pulse at 1.5 /spl mu/m while modifying the refractive index with a strong pump pulse at 1.7 /spl mu/m (where the crystal is highly transparent) with an intensity of up to 20 GW/cm/sup 2/. In order to prove that optical modulation was nonlinear in origin, Z-scans were performed on the sample, which suggest that TPA far exceeds linear absorption at that intensity level. These results show that TPA and the Kerr effect can produce all-optical switching in photonic crystals and will need to be taken into account when semiconductor-based photonic crystals are used in applications where short pulses and high intensities are involved.
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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".