Coupling of Localized Surface Plasmon Resonance in Self-Organized Polystyrene-Capped Gold Nanoparticle Films
Bibliographic record
Abstract
Glass-deposited monolayers of polystyrene-coated gold nanoparticles with controlled interparticle distance have been prepared. Normal incidence extinction spectra show a progressive red shift of the plasmon resonance wavelength as the interparticle gap within the film is reduced. Polarized extinction spectra were measured at in-plane incidence using an optical waveguide lightmode spectroscopy (OWLS) setup. The in-plane (TE)-polarized spectra show a red shift with decreasing interparticle gap, whereas the out-of-plane (TM)-polarized component shows no visible change. These observations are typical of dipolar near-field interparticle plasmon coupling. Simulations using the discrete dipole approximation have been conducted to compare the decay rate of the red shift with increasing interparticle gap for different particle arrangements (pair, row of 5 and 2D hexagonal array of 19). The calculations show that the variation of the relative red shift with the relative interparticle spacing follows a first-order exponential decay law in all three structures, with a decay constant similar to results previously reported. A secondary, slower decay rate, occurring at relative interparticle gap values above 1.25, is found for the 2D array. The decay constant of this large-distance regime is close to that of the measured extinction spectra of the polystyrene-coated gold nanoparticles monolayers, which present relative interparticle distances within this range. This second decay constant may be the result of an increased contribution of higher-order modes.
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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".