Surface plasmons on zig-zag gratings

Optical excitation of surface plasmons polaritons (SPPs) on a 'zig-zag diffraction grating' is explored. The fabricated silver grating consists of sub-wavelength grooves 'zig-zagged' along their length, providing a diffractive periodicity to visible radiation. SPPs propagating in...

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Bibliographic Details
Published in:Optics express 2012-10, Vol.20 (21), p.23921-23926
Main Authors: Constant, Thomas J, Taphouse, Tim S, Rance, Helen J, Kitson, Stephen C, Hibbins, Alastair P, Sambles, J Roy
Format: Article
Language:English
Subjects:
Equipment Design
Equipment Failure Analysis
Light
Nanoparticles - chemistry
Refractometry - instrumentation
Scattering, Radiation
Silver - chemistry
Surface Plasmon Resonance - instrumentation
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Summary:Optical excitation of surface plasmons polaritons (SPPs) on a 'zig-zag diffraction grating' is explored. The fabricated silver grating consists of sub-wavelength grooves 'zig-zagged' along their length, providing a diffractive periodicity to visible radiation. SPPs propagating in the diffraction plane and scattered by an odd number of grating vectors are only excited by TE polarized radiation, whereas for TM polarized light, which also induces surface charge, SPP excitation is forbidden by the grating's broken-mirror symmetry.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.20.023921