Sensitivity enhancement in grating coupled surface plasmon resonance by azimuthal control.
Opt Express
; 17(14): 12145-54, 2009 Jul 06.
Article
em En
| MEDLINE
| ID: mdl-19582129
ABSTRACT
We present a method for improving the sensing capability of grating coupled surface plasmon resonance (GCSPR) sensors. The grating is rotated azimuthally (phi) until the excitation of double surface plasmon polaritions (SPPs) by a single wavelength is possible. Close to this condition, further tuning of the incident wavelength will merge the double SPPs into a multi-SPP resonance which is angularly broad but spectrally sharp. This is the condition where the momentum vector of the propagating SPP is perpendicular to the incident light momentum. We demonstrate this sensitivity enhancement on a Au grating surface using a dodecanethiol (C12) self-assembled monolayer (SAM). Using this method, a shift in resonance angle as large as 3 degrees can be observed. The simulated sensitivity of this method shows that a sensitivity up to 800 degrees /RIU is achievable, which is one order of magnitude greater than that in a conventional fixed grating (phi = 0 degrees ) as well as the prism-coupled Kretschmann configuration.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ressonância de Plasmônio de Superfície
/
Óptica e Fotônica
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Opt Express
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Itália