Journal
ACS PHOTONICS
Volume 2, Issue 2, Pages 256-262Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph500360d
Keywords
plasmonics; biosensing; nanohole; nanodisk; surface plasmon resonance; atomic layer deposition
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Funding
- SSF
- Swedish Research Council
- U.S. National Science Foundation (NSF)
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1054191] Funding Source: National Science Foundation
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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 (similar to 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.
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