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Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet

Electromagnetically Induced Transparency in Metamaterials

Philippe Tassin, Lei Zhang, Thomas Koschny, Eleftherios N. Economou, Costas M. Soukoulis

Published May 31, 2009• 0 citations
OpenAlex

Abstract

We present two metamaterial designs exhibiting spectral features similar to electromagnetically induced transparency in their electric and magnetic response, respectively. These metamaterials combine low absorption with the high group velocity required for slow-light applications.

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Metamaterials, or artificial materials with optical properties not known for natural materials, have recently been used to demonstrate unusual optical phenomena, such as negative refraction, perfect lenses, subwavelength components, and electromagnetic invisibility cloaks. Most of the metamaterials designed to date are periodic structures containing a single resonating element in each unit cell, such as a split-ring resonator (SRR), a cutwire, or a slab-wire pair [1]. In this contribution, we demonstrate that a metamaterial with two coupled SRRs can exhibit an effect reminiscent of electromagnetically induced transparency (EIT), a coherent process normally observed in three-level atomic media [2]. Due to this process, a small transparency window with low absorption appears in the spectral response of the metamaterial. Simultaneously, extremely steep normal dispersion is observed in the transparency window, which is useful for slow-light applications.
This study demonstrates a metamaterial with two coupled split-ring resonators (SRR) can exhibit an effect reminiscent of electromagnetically induced transparency (EIT), a coherent process normally observed in three-level atomic media. The coupling between two SRR induces a frequency splitting in the spectral response of the metamaterial, opening up a narrow transmission band in the centre of the absorption line. The obtained reduction in group velocity together with the low absorption is useful for a variety of slow-light applications, without the need for the extreme cooling or the large magnetic fields that are typically required for EIT in atomic systems.