1 March 2006 Plasmonic films with a periodic arrangement of subwavelength slits
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Abstract
In a recent paper [Phys. Rev. Lett. 94, 197401 (2005)], we introduced a mechanism for creating artificial high refractive index metamaterials by exploiting the existence of sub-wavelength propagating modes in metallic systems. We showed that a perfect metal film with a periodic arrangement of sub-wavelength cut-through slits can be regarded as a dielectric slab with a frequency-independent effective index. Here, we discuss the optical properties of such a system when the perfect metal condition is no longer valid, e.g., in the visible and near infrared wavelength regimes. If the metal obeys a plasmonic dispersion model, we find that films with a periodic arrangement of sub-wavelength slits support two distinct types of guided modes: a surface mode and a set of effective dielectric slab modes. We show how the behavior of both modes is affected by film thickness and surface properties.
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Peter B. Catrysse, Peter B. Catrysse, Georgios Veronis, Georgios Veronis, Jung-Tsung Shen, Jung-Tsung Shen, Hocheol Shin, Hocheol Shin, Shanhui Fan, Shanhui Fan, } "Plasmonic films with a periodic arrangement of subwavelength slits", Proc. SPIE 6128, Photonic Crystal Materials and Devices IV, 612818 (1 March 2006); doi: 10.1117/12.648510; https://doi.org/10.1117/12.648510
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