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Optics Communications

Electromagnetic transparency and slow light in an isotropic 3D optical metamaterial, due to Fano-like coupling of Mie resonances in excitonic nano-sphere inclusions

Ali Panahpour, Hamid Latifi

Published Dec 10, 2010• 3 citations
Publisher
DOI
10.1016/j.optcom.2010.11.075

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We propose a concept of a low-symmetry three-dimensional metamaterial exhibiting a double-continuum Fano (DCF) optical resonance. Such metamaterial is described as a birefringent medium supporting a discrete dark electromagnetic state weakly coupled to the continua of two nondegenerate bright bands of orthogonal polarizations. It is demonstrated that light propagation through such DCF metamaterial can be slowed down over a broad frequency range when the medium parameters (e.g., frequency of the dark mode) are adiabatically changed along the optical path. Using a specific metamaterial implementation, we demonstrate that the DCF approach to slow light is superior to that of the electromagnetically induced transparency because it enables spectrally uniform group velocity and transmission coefficient.
We theoretically and experimentally studied the coupling of the magnetic Mie resonance of a dielectric cuboid and the guide mode resonance of an alumina slab in an all-dielectric metamaterial. It is found that the excitation of the discrete guide mode resonance or substrate resonance of the alumina slab can be properly controlled by designing the geometry of the dielectric cuboid. Moreover, it is found that the coupling of substrate resonance and the Mie resonance of the cuboid can be tailored to achieve electromagnetically induced transparency (EIT)--like spectrum. The tunability of the EIT-like spectrum based on the geometric parameters was also studied. Our results utilizing the crucial contribution of substrate derive a realization of EIT in all-dielectric metamaterial and thus pave a way for optical spectral control with all-dielectric coupled system.
Slow light technique has significant potential applications in many contemporary photonic device developments for integrated all-optical circuit, such as buffers, regenerators, switches and interferometers. In this paper, we present an efficient coupling mechanism of an electromagnetically induced transparency like (EIT-like) effect in an all-dielectric nano-metamaterial. This EIT-like effect is generated by destructive interference between a radiative Fabry-Perot (FP) mode and a dark waveguide (WG) mode, which is based on a combined structure of a dielectric grating and multilayer films. The dark WG mode is excited by guided mode of dielectric grating instead of radiative FP mode. In analogy to the molecular transition process, the FP mode, guided mode and WG mode are denoted by excited states of |1〉, |2〉 and |3〉. The two coupling pathways of the EIT-like effect in our metamaterial are |0〉 → |1〉 and |0〉 → |2〉 → |3〉 → |1〉, where |0〉 is the ground state. The simulated resonant wavelength of WG mode is consistent with theoretical result. We further confirm this EIT-like effect through a two-oscillator coupling analysis. We achieve a group refractive index of 913.6 by adjusting these two modes coupling of the EIT-like effect, which is useful for developing slow light device. This work provides a valuable solution to realize electromagnetically induced transparency in all-dielectric nanomaterial.