In this paper we investigate on the spectral behaviour of slit array realized in a thick gold film surrounded by a homogeneous environment. The study has been performed by means of 3D-FDTD based codes, including the modelling of the metal dispersion through Drude-Lorentz fitting. The numerical results show that when the period p of the slit array is comparable to a multiple of the source wavelength, impinging at normal incidence, and the slit size is small enough to consider the input-output interfaces virtually smooth, transmission diagrams exhibit a minimum around λmin, where a matching condition occurs. Moreover when random variations of the slit spacing (elementary cell of the periodic structure composed by different periodicities) are considered, the matching condition for the N-th resonant order is asymptotically equal to that obtained when an array of slits having constant spacing equal to the averaged value of all periodicities is considered

Anomalous plasmonic band gap formation in two-dimensional slit arrays with different periods / Marrocco, V.; Marani, R.; Morea, G.; Grande, Marco; Vincenti, M. A.; De Ceglia, D.; Petruzzelli, Vincenzo; D'Orazio, Antonella. - STAMPA. - (2011). [10.1109/ICTON.2011.5970775]

Anomalous plasmonic band gap formation in two-dimensional slit arrays with different periods

GRANDE, Marco;PETRUZZELLI, Vincenzo;D'ORAZIO, Antonella
2011-01-01

Abstract

In this paper we investigate on the spectral behaviour of slit array realized in a thick gold film surrounded by a homogeneous environment. The study has been performed by means of 3D-FDTD based codes, including the modelling of the metal dispersion through Drude-Lorentz fitting. The numerical results show that when the period p of the slit array is comparable to a multiple of the source wavelength, impinging at normal incidence, and the slit size is small enough to consider the input-output interfaces virtually smooth, transmission diagrams exhibit a minimum around λmin, where a matching condition occurs. Moreover when random variations of the slit spacing (elementary cell of the periodic structure composed by different periodicities) are considered, the matching condition for the N-th resonant order is asymptotically equal to that obtained when an array of slits having constant spacing equal to the averaged value of all periodicities is considered
2011
IEEE Conference Proceedings,13th International Conference on Transparent Optical Networks
978-1-4577-0881-7
IEEE
Anomalous plasmonic band gap formation in two-dimensional slit arrays with different periods / Marrocco, V.; Marani, R.; Morea, G.; Grande, Marco; Vincenti, M. A.; De Ceglia, D.; Petruzzelli, Vincenzo; D'Orazio, Antonella. - STAMPA. - (2011). [10.1109/ICTON.2011.5970775]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/52462
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