Non-Bloch plasmonic stop-band in real-metal gratings

E. Popov (1) , Nicolas Bonod (1) , Stefan Enoch (1)

1 FRESNEL - Institut FRESNEL

Recent studies of plasmon surface wave (PSW) propagation in short-period perfectly conducting gratings have shown formation of stop-band that are not linked to the interaction between two ( counter) propagating surface waves. We study the properties of this stop-band in real metals. While for both perfectly conducting and real metals the propagation constant of PSW grows with the groove height, the stop-band in real metals appears for groove heights significantly smaller than in perfect metals. A physical explanation of the formation of the stop-band is proposed both by using a homogenisation of the corrugated layer and by analysis of the tangential electric field component.

Mots clés: Surface plasmons; Diffraction gratings

Domaines: Optique / photonique

E. Popov, Nicolas Bonod, Stefan Enoch. Non-Bloch plasmonic stop-band in real-metal gratings. Optics Express, 2007, 15 (10), pp.6241-3250. ⟨hal-00222979⟩