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Influence of the Evanescent Field Decay Length on the Sensitivity of Plasmonic Nanodisks and Nanoholes

Francesco Mazzotta (Institutionen för teknisk fysik, Biologisk fysik) ; T. W. Johnson ; Andreas Dahlin (Institutionen för teknisk fysik, Bionanofotonik) ; J. Shaver ; S. H. Oh ; Fredrik Höök (Institutionen för teknisk fysik, Biologisk fysik)
Acs Photonics (2330-4022). Vol. 2 (2015), 2, p. 256-262.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: plasmonics, biosensing, nanohole, nanodisk, surface plasmon resonance, atomic layer deposition



Denna post skapades 2015-03-30. Senast ändrad 2016-07-07.
CPL Pubid: 214545

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Biologisk fysik (2007-2015)
Institutionen för teknisk fysik, Bionanofotonik (2007-2015)

Ämnesområden

Optisk fysik
Nanoteknik

Chalmers infrastruktur