17 January 2011 Linear and nonlinear resonant effects in metallic arrays of sub-wavelength channels filled with GaAs
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Abstract
We investigate on the interaction of surface plasmon modes with TEM, Fabry-Perot-like cavity modes in arrays of subwavelength slits filled with GaAs. A full control on the transmission process, which is mostly dictated by the geometrical parameters of the array, such as the slit length and width as well as the separation between the slits, is achieved and explained. The effects of the interaction of pure cavity modes and surface modes lead to the formation of an energy band gap, i.e. a spectral band where a drastic inhibition of transmission is induced by the coupling and backradiation of the smooth-interface, unperturbed surface plasmon. Strong field localization in sub-wavelength regions boosts also the nonlinear response of the structure. The mere assumption that the metal is nonlinear via Coulomb and Lorentz contributions, and the introduction of high-index, nonlinear media, such as III-V semiconductors, in the subwavelength channels opens a cross-coupling of TE and TM polarizations for both pump and harmonic signals and makes it possible to generate both TE- and TM-polarized fields. These fields are generated even under high-absorption conditions, and survive thanks to a phase locking mechanism that sets in between the pump and its harmonics.
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M. A. Vincenti, M. A. Vincenti, D. de Ceglia, D. de Ceglia, N. Akozbek, N. Akozbek, M. Scalora, M. Scalora, } "Linear and nonlinear resonant effects in metallic arrays of sub-wavelength channels filled with GaAs", Proc. SPIE 7941, Integrated Optics: Devices, Materials, and Technologies XV, 79410Z (17 January 2011); doi: 10.1117/12.873647; https://doi.org/10.1117/12.873647
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