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Crystals 2014, 4(4), 498-508; doi:10.3390/cryst4040498

Plasmonic Photonic-Crystal Slabs: Visualization of the Bloch Surface Wave Resonance for an Ultrasensitive, Robust and Reusable Optical Biosensor

1
Ioffe Physical-Technical Institute, Politekhnicheskaya 26, St. Petersburg 194021, Russia
2
Institute for Theoretical and Applied Electromagnetics, Izhorskaya 13, Moscow 125412, Russia
*
Author to whom correspondence should be addressed.
Received: 17 July 2014 / Revised: 10 October 2014 / Accepted: 31 October 2014 / Published: 4 December 2014
(This article belongs to the Special Issue Photonic Crystals)
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Abstract

A one-dimensional photonic crystal (PhC) with termination by a metal film—a plasmonic photonic-crystal slab—has been theoretically analyzed for its optical response at a variation of the dielectric permittivity of an analyte and at a condition simulating the molecular binding event. Visualization of the Bloch surface wave resonance (SWR) was done with the aid of plasmon absorption in a dielectric/metal/dielectric sandwich terminating a PhC. An SWR peak in spectra of such a plasmonic photonic crystal (PPhC) slab comprising a noble or base metal layer was shown to be sensitive to a negligible variation of refractive index of a medium adjoining to the slab. As a consequence, the considered PPhC-based optical sensors exhibited an enhanced sensitivity and a good robustness in comparison with the conventional surface-plasmon and Bloch surface wave sensors. The PPhC biosensors can be of practical importance because the metal layer is protected by a capping dielectric layer from contact with analytes and, consequently, from deterioration. View Full-Text
Keywords: plasmonic photonic crystal; surface Bloch wave; surface plasmon; biosensor plasmonic photonic crystal; surface Bloch wave; surface plasmon; biosensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Baryshev, A.V.; Merzlikin, A.M. Plasmonic Photonic-Crystal Slabs: Visualization of the Bloch Surface Wave Resonance for an Ultrasensitive, Robust and Reusable Optical Biosensor. Crystals 2014, 4, 498-508.

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