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01301 am a22001933u 4500 |
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201077 |
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|a Holmes, C.
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|a Daly, K.R.
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|a Sparrow, I.J.G.
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|a Gates, J.C.
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|a D'Alessandro, G.
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|a Smith, P.G.R.
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|a Excitation of surface plasmons using tilted planar-waveguide Bragg gratings
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|c 2011-09.
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|u https://eprints.soton.ac.uk/201077/1/05982073.pdf
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|a We present a planar integrated optical surface plasmon refractometer. The fabricated device operates by grating-matched coupling between a core waveguide mode and a set of hybrid plasmon-dielectric modes of a much wider integrated structure. The constructed device incorporates a 50 nm thin gold layer that separates a tilted planar-waveguide Bragg grating and a liquid analyte. It is demonstrated that polarization dependent plasmon anomalies occur in the transmission spectra of the device, which are understood using a numerical Cauchy integral mode solving approach. Sensitivities in this planar integrated device are comparable to existing fiber based plasmonic sensors, but with the advantages of planar integration and microfluidic adaptation.
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