Environment effects on surface-plasmon spectra in gold-island films potential for sensing applications
| Autor: | Todd R. Downey, Ali Passian, Thomas L. Ferrell, A. Wig, Fabrice Meriaudeau |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Absorption spectroscopy business.industry Materials Science (miscellaneous) Surface plasmon Physics::Optics Dielectric Polarization (waves) Refraction Industrial and Manufacturing Engineering Spectral line Optics Business and International Management Thin film business Refractive index |
| Zdroj: | Applied Optics. 37:8030 |
| ISSN: | 1539-4522 0003-6935 |
| DOI: | 10.1364/ao.37.008030 |
| Popis: | The effects of the local dielectric environment on the surface-plasmon resonances of annealed gold-island films as a potential for sensing applications are studied experimentally and modeled theoretically. Gold-island films were annealed at 600 degrees C to produce spheroidal shape particles that exhibit well-resolved resonances in polarized, angle-resolved, absorption spectra. These resonances are shifted in different amounts by the depolarization effect of the surrounding medium (liquids with various refraction indices). Cross-section calculations based on nonretarded, single-particle, dielectric interaction for these various configurations are presented and are found to be in good agreement with the experimental observations. The results show an interesting potential for biosensing or environmental monitoring applications. |
| Databáze: | OpenAIRE |
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