Extraordinary transmission beyond the cut-off through sub- annular aperture arrays
- Resource Type
- Article
- Authors
- Baida, Fadi I.; Poujet, Yannick; Salvi, Jérôme; Labeke, Daniel Van; Guizal, Brahim
- Source
- Optics Communications. Apr2009, Vol. 282 Issue 7, p1463-1466. 4p.
- Subject
- *OPTICAL films
*NANOSTRUCTURED materials
*PHOTONICS
*SPECTRUM analysis
*LIGHT transmission
*INTEGRATED optics
- Language
- ISSN
- 0030-4018
Abstract: 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. [Copyright &y& Elsevier]