Influence of the Evanescent Field Decay Length on the Sensitivity of Plasmonic Nanodisks and Nanoholes
| Autor: | Sang Hyun Oh, Fredrik Höök, Andreas B. Dahlin, Jonah Shaver, Francesco Mazzotta, Timothy W. Johnson |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry Dielectric Noise (electronics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Atomic layer deposition Optics Transducer Optoelectronics Electrical and Electronic Engineering Surface plasmon resonance business Biosensor Refractive index Plasmon Biotechnology |
| Zdroj: | ACS Photonics. 2:256-262 |
| ISSN: | 2330-4022 |
| Popis: | We evaluate and compare the sensitivity of gold nanodisks on silica substrates and nanoholes made in silica-supported gold films, two of the most common sensor structures used in plasmonic biosensing. An alumina overcoat was applied by atomic layer deposition (ALD) to precisely control the interfacial refractive index and determine the evanescent plasmonic field decay length. The results are in good agreement with analytical models and biomolecular binding experiments for the two substrates. We found that nanodisks outperform nanoholes for thin dielectric coatings ( ∼20 nm). The optimum nanoplasmonic transducer element for a given biorecognition reaction can be chosen based on experimentally determined bulk sensitivities/noise levels and theoretically estimated evanescent field decay lengths. |
| Databáze: | OpenAIRE |
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