Abstract
We propose an anisotropic photonic crystal (PC) structure with close-to-zero effective parameters. The anisotropic zero-index property of PCs provides complex iso-frequency contours, where their shapes can change from ellipses or hyperbolae to a linear crossing. A mechanism of light beam splitting can be achieved by utilizing the linear crossing shaped iso-frequency curve. The manipulation of light beam propagations is verified by both numerical simulations and microwave experiments. By using pure dielectrics and scaling down to optical wavelengths, we also propose a design of nonperiodic PC structures to achieve optical unidirectional cloaking without size or shape limitation. Our design provides a promising platform for cloaking applications in the optical regime.
Highlights
Zero-index metamaterials whose refractive index is near zero exhibit exotic properties such as infinite phase velocity and effective wavelength.12–26 Fascinating applications of zero-index metamaterials, including arbitrary waveguiding,12,13 directive emissions,14,15 deterministic interface states,16,17 collimation,18 and cloaking in a waveguide19 have been suggested
We propose an anisotropic photonic crystal (PC) structure with close-to-zero effective parameters
By using pure dielectrics and scaling down to optical wavelengths, we propose a design of nonperiodic PC structures to achieve optical unidirectional cloaking without size or shape limitation
Summary
Zero-index metamaterials whose refractive index is near zero exhibit exotic properties such as infinite phase velocity and effective wavelength.12–26 Fascinating applications of zero-index metamaterials, including arbitrary waveguiding,12,13 directive emissions,14,15 deterministic interface states,16,17 collimation,18 and cloaking in a waveguide19 have been suggested.
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