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Zero-Index All-Dielectric Metamaterials at Optical Frequencies
Keywords: Metamaterials, Optics, Nanofabrication
Ohmic loss in metal based metamaterials continues to be one of the primary impediments to their application at infrared and visible frequencies. Dielectric metamaterials offer one potential solution to this issue by eliminating ohmic loss as well as avoiding saturation in the magnetic response at high frequencies. In this work, we will discuss our recent efforts to develop three-dimensional purely dielectric metamaterials at optical frequencies based on structured silicon. These resonant dielectric metamaterials are employed for achieving near-zero refractive index at optical frequencies. Formed from stacked silicon rod unit cells exhibiting both electric and magnetic dipole Mie resonances, these metamaterials exhibit impedance matched near-zero refractive index at optical frequencies allowing near unity transmission. We present experimental evidence of a nearly isotropic low-index response including angular selectivity of transmission and directive emission from quantum dots placed within the metamaterial. These isotropic low-loss metamaterials can be applied for a variety of applications including directional emitters, filters, and compact lens systems.
Yuanmu Yang, Research Assistant
Vanderbilt University
Nashville, Tennessee

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