Plasmon-enhanced refractometry using silver nanowire coatings on tilted fibre Bragg gratings

Regenerated Fibre Bragg Gratings

5 Fibre Bragg Gratings

Generation of infrared surface plasmon resonances with high refractive index sensitivity utilizing tilted fiber Bragg gratings.

We demonstrate the use of tilted fiber gratings to assist the generation of localized infrared surface plasmons with short propagation lengths and a sensitivity of dlambda/dn = 3,365 nm in the aqueous index regime. It was also found that the resonances could be spectrally tuned over 1,000 nm at the same spatial region with high coupling efficiency (in excess of 25 dB) by altering the polarizati...

Characterization of infrared surface plasmon resonances generated from a fiber-optical sensor utilizing tilted Bragg gratings

T. Allsop,* R. Neal, S. Rehman, D. J. Webb, D. Mapps, and I. Bennion Photonics Research Group, Aston University, Aston Triangle, Birmingham, B4 7ET, United Kingdom Department of Communications and Electrical Engineering, Facility of Technology, University of Plymouth, Plymouth, PL4 8AA, United Kingdom FiberLogix Limited, Ashley House, Vale Industrial Park, Tolpits Lane, Watford, Herts, WD18 9QP...

Plasmon-enhanced Bragg diffraction

The diffraction from a single periodic metallic grating is shown to be significantly modified when a surfaceplasmon polariton wave is excited at the metal-dielectric interface. In particular, vanishing diffraction orders in accordance with scalar diffraction theory, are generated in the presence of the surface wave. This modification is analytically explained, and a plasmonic Bragg law is formu...