Enhanced transmission due to nonplasmon resonances in one- and two-dimensional gratings.
Enhanced transmission through subwavelength slit gratings and hole arrays is studied in view of its application in the far-infrared and microwave domains. Because for perfectly conducting gratings, plasmon resonances are not expected to produce an enhanced transmission, other kinds of resonance, such as Fabry-Perot, waveguide-mode, and cavity-mode resonances, are studied. The possibility of reaching 100% transmittivity for some particular wavelengths is established when two superimposed identical gratings are used while each of them transmits approximately 1% off resonance. A similar transmission is obtained with hole arrays. The study of the field map inside the groove region allows our establishing the nature of the resonance, that is involved. Comparison of the bandwidth with respect to the wavelength or incidence given by various kinds of resonance is presented.
Institut Fresnel, Unité Mixte de Recherche associé au Centre National de Recherche Scientifique 6133, Faculté des Sciences et Techniques de Saint-Jérôme, Case 161, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex 20, France. e.popov@fresnel.fr
Evgeny
E
Popov
Stefan
S
Enoch
Gérard
G
Tayeb
Michel
M
Nevière
Boris
B
Gralak
Nicolas
N
Bonod