Ellipsometry study on gold-nanoparticle-coated gold thin film for biosensing application
| Autor: | Pei-Kuen Wei, Yia-Chung Chang, Rakesh S. Moirangthem |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Total internal reflection
ocis:(280.4788) Optical sensing and sensors Materials science ocis:(240.6680) Surface plasmons Surface plasmon Nanoparticle Nanotechnology Atomic and Molecular Physics and Optics Colloidal gold Ellipsometry ocis:(120.2130) Ellipsometry Surface plasmon resonance Thin film ocis:(120.3940) Metrology Plasmon Biosensors and Molecular Diagnostics ocis:(280.1415) Biological sensing and sensors Biotechnology |
| Zdroj: | Biomedical Optics Express |
| ISSN: | 2156-7085 |
| Popis: | The amplified plasmonic response from various distributions of gold nanoparticles (AuNPs) coated on top of gold thin film was studied via ellipsometry under total internal reflection mode. The surface plasmon resonance dip can be tuned from the visible to near infrared by simply varying the AuNP concentration. Theoretical modeling based on effective medium theory with a multi-slice model has been employed to fit the experimental results. Additionally, this experimental tool has been further extended to study bio-molecular interactions with metal surfaces as well as in studying protein-protein interaction without any labeling. Hence, this technique could provide a non-destructive way of designing tunable label-free optical biosensors with very high sensitivity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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