Generation and control of hot spots on commensurate metallic gratings

We study the light localization on commensurate arrangements of deep metallic sub-wavelength grooves. We theoretically show that as the degree of commensuration tends to an irrational number new light localization states are produced. These have properties close to that reported for hot spots on dis...

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Bibliographic Details
Published in:Optics express 2008-11, Vol.16 (23), p.19127-19135
Main Authors: Barbara, A, Le Perchec, J, Collin, S, Sauvan, C, Pelouard, J-L, López-Ríos, T, Quémerais, P
Format: Article
Language:English
Subjects:
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Light
Metals - chemistry
Optics
Physics
Refractometry - instrumentation
Refractometry - methods
Reproducibility of Results
Scattering, Radiation
Sensitivity and Specificity
Surface Plasmon Resonance - instrumentation
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Summary:We study the light localization on commensurate arrangements of deep metallic sub-wavelength grooves. We theoretically show that as the degree of commensuration tends to an irrational number new light localization states are produced. These have properties close to that reported for hot spots on disordered surfaces and are not permitted for simple period gratings. Existence of these new resonances is experimentally provided in the infra-red region by reflectivity measurements performed on two commensurate samples with respectively two and three slits per period. Manipulations of these hot spots which can be controlled from far-field could be used for high sensitivity spectroscopy applications.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.16.019127