Optical and structural characterization of nanostructured Alq₃ with negative in-plane birefringence
Bibliographic record
Abstract
In this study, we investigate the optical and structural properties of tilted columnar thin films composed of Alq₃ in order to better understand the source of the in-plane birefringence exhibited by such films which is critical in designing and modelling nanostructured devices incorporating porous architectures such as photonic crystals (ie: square spiral structure), rugate filters, and polarized light emitting devices. Previous work done on chiral Alq₃ films have demonstrated a notable absence of column broadening and secondary structural anisotropy (asymmetric fanning of columns) commonly observed in inorganic films. In addition, strong chiral optical behaviour is observed in Alq₃ helical films dependent on the deposition angle. The magnitude of circular Bragg reflection (preferential reflection of one handedness of circular polarized light) of chiral thin films is related to the in-plane birefringence. This suggests that the in-plane birefringence of tilted columnar Alq3 films drives such behaviour and should increase with the deposition angle. This trend is contrary to the one observed in tilted columnar inorganic thin films which exhibit peak values of in-plane birefringence at deposition angles 60° < alpha < 70°.Variable angle spectroscopic ellipsometry, scanning electron microscopy, and the Bruggeman effective medium approximation description was used to characterized the films.
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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) | 0.000 | 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
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