Microstructural and optical properties of Ba0.5Sr0.5TiO3 thin film deposited by pulsed laser deposition for low loss waveguide applications
Bibliographic record
Abstract
Barium strontium titanate (Ba0.5Sr0.5TiO3 or BST) films were grown on SiO2∕Si substrate by means of a reactive pulsed laser deposition technique. The microstructural and surface morphology of BST films were characterized by x-ray diffraction, scanning electron microscopy, and atomic force microscopy. Films deposited at 400°C were found to be amorphous and present wide cracks. The crystallization of the films was induced by annealing at 600°C. The BST films deposited at 550°C present a cubic perovskite structure with a dense and smooth surface. The optical constants (n and k as a function of wavelength) of the films were obtained using variable angle spectroscopic ellipsometry in the UV-vis-NIR regions. Microfabricated BST∕SiO2∕Si ridged waveguides were patterned using UV photolithography and high-density plasma etching. The propagation and loss characteristics at the telecommunication wavelength of 1.55μm were investigated using top-view scattering and Fabry-Pérot resonance methods. For specific ridge widths, we obtained single-mode propagation with relatively low losses (∼1dB∕cm), thereby demonstrating the strong potential of BST films for guided-wave components for advanced optical integrated systems.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".