Planar Quarter Wave Stack Reflectors Prepared from Chalcogenide Ge-Se and Polymer Polystyrene Thin Films
Bibliographic record
Abstract
For many decades the multilayer structures consisting of alternating dielectric films with sufficient differences in the refractive index have played an important role in designing highly effective planar optical elements, namely mirrors and filters. The one-dimensional photonic bandgaps are formed in the dielectric multilayers if optical constants and thicknesses of films meet the Bragg resonance condition. These photonic bandgaps display themselves as high intensity reflection or transmission bands in the optical spectra of the dielectric multilayers. Dielectric multilayers are widely used as highly effective reflectors and filters in current optical devices. Their bandgap structure can be predicted according to the theory of the light propagation through stratified dielectric media The interest in dielectric multilayers was renewed again when the omnidirectional bandgap The omnidirectional total reflection from such quarter wave stacks (QWS) allows the designing of the reflectors that can reflect the light at any angles and polarizations. A common goal in current QWS device design is then a maximization of a bandwidth of the omnidirectional bandgap by using materials having a high refractive index difference. From material point of view, the first successful fabrications of planar omnidirectional reflectors with bandgaps in the visible, near-infrared and middle-infrared ranges were reported on materials such as SiO 2 /TiO 2 , Si/SiO 2 or GaAlN/GaN. These materials exhibited favourable optical properties and a high chemical, thermal, and mechanical stability. However, they brought at the same time high cost and some technological difficulties relating to their high temperature processing (annealing) which can lead to the structural defects of films, e.g., crystallization, cracking or delamination Recent development also showed a possibility of a low temperature fabrication of QWS devices from chalcogenide and polymer films. Chalcogenide glasses and organic polymers 16 www.intechopen.com
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| 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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 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".