Comparison of plasmon surface waves on shallow and deep metallic 1D and 2D gratings

Evgeny K. Popov,Sefan Enoch,Nicoals Bonod

doi:10.1364/oe.15.004224

Abstract

The propagation of a plasmon surface wave in deep metallic lamellar gratings is shown to be characterized by absorption losses smaller than on a flat metallic-dielectric interface. This feature is due to the formation of a resonance of the electric field inside the groove. Similar to the plasmon surface wave in shallow gratings, this kind of plasmon can lead to total absorption of incident light and to a significant enhancement of the local field density in the vicinity of the grating surface, contrary to the other type of grating anomaly linked with a cavity resonance.

Highlights

Plasmon surface waves that are supported by a metal-dielectric interface are known to play a major role in many domains of optics, spectroscopy, chemistry, and biophysics
If the history has started with Wood’s discovery of grating anomalies [1] finding its links with the plasmon surface waves in the works of Fano [2] and Hessel and Oliner [3], their importance in periodic structures has not been rerouted by the interest devoted to SERS [4] in the 1980s’
Surface plasmon excitation allows for increasing of electromagnetic field density even in single apertures, which starts to serve for singlemolecule detection [6] in chemistry and biology

Summary

Introduction

Plasmon surface waves that are supported by a metal-dielectric interface are known to play a major role in many domains of optics, spectroscopy, chemistry, and biophysics. The problem of plasmon surface waves (PSW) in lamellar metallic gratings and hole arrays has been the subject of extensive theoretical, numerical, and experimental studies during the last decade.

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Conclusion