Extraordinary transmission beyond the cut-off through sub-λ annular aperture arrays

F.I. Baida (1) , Y. Poujet (1) , J. Salvi (1) , D. van Labeke (1) , B. Guizal (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

It was recently established that coaxial nano-aperture arrays perforated in optically thick silver films exhibit an extraordinary transmission in the visible range thanks to a guided mode. However this mode has a cut-off wavelength beyond which the transmission dramatically decreases. We propose here a cascaded structure that is shown to act as a high quality spectral filter in the visible range (finesse up to 200). It is also found that the transmission is enhanced by a factor of 150 for specific wavelengths. This kind of cascaded nano-structured metallic layers offers many promising applications in nano-photonics such as the integration of functionalities for optical signal processing. It opens up the path for the conception of a new generation of integrated components based on metallo-dielectric structures that can be easily tailored as tunable devices.

Domaines: Optique / photonique

F.I. Baida, Y. Poujet, J. Salvi, D. van Labeke, B. Guizal. Extraordinary transmission beyond the cut-off through sub-λ annular aperture arrays. Optics Communications, 2009, 282 (7), pp.1463-1466. ⟨10.1016/j.optcom.2008.12.021⟩. ⟨hal-00361706⟩