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Broadband giant-refractive-index material based on mesoscopic space-filling curves
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Broadband giant-refractive-index material based on mesoscopic space-filling curves
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Journal Article
Broadband giant-refractive-index material based on mesoscopic space-filling curves
2016
Overview
The refractive index is the fundamental property of all optical materials and dictates Snell’s law, propagation speed, wavelength, diffraction, energy density, absorption and emission of light in materials. Experimentally realized broadband refractive indices remain <40, even with intricately designed artificial media. Herein, we demonstrate a measured index >1,800 resulting from a mesoscopic crystal with a dielectric constant greater than three million. This gigantic enhancement effect originates from the space-filling curve concept from mathematics. The principle is inherently very broad band, the enhancement being nearly constant from zero up to the frequency of interest. This broadband giant-refractive-index medium promises not only enhanced resolution in imaging and raised fundamental absorption limits in solar energy devices, but also compact, power-efficient components for optical communication and increased performance in many other applications.
The refractive index of natural materials only covers a limited range. Here, Chang
et al
. use the principle of space-filling curves to construct a mesoscopic crystal with a refractive index greater than 1000 at GHz frequencies. The concept is inherently broadband and scalable.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
