Journal
OPTICS EXPRESS
Volume 23, Issue 8, Pages 10293-10300Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.010293
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Funding
- Land Steiermark (HTI MSApp, PPBioSensoren)
- NAWI Graz
- FWF [SFB F49 Nextlite]
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We experimentally investigate the local refractive index sensitivity of plasmonic gold nanodisks by applying small polymer dots to selected disk sites by means of two-step lithography. Measured sensitivity profiles obtained from tracking the polymer-induced spectral shift of the plasmon modes are in excellent agreement with numerical simulation of both spectral sensitivity and the electric near field of the nanodisks. Based on the nanodisk sensitivity profile we tailor a sensitive and spatially uniform plasmonic sensor by capping the disk with a dielectric layer, thus restricting analyte access to the disk rim. (C)2015 Optical Society of America
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