Volume 100, Number 3, November 2012
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 November 2012|
On the omnidirectional radiation via radially anisotropic zero-index metamaterials
1 Department of Physics, Fudan University - Shanghai 200433, China
2 Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) - China
3 Department of Optical Science and Engineering, Fudan University - Shanghai 200433, China
Received: 19 September 2012
Accepted: 28 October 2012
By a comprehensive mathematical derivation, we show that the underlying physics of realizing a two-dimensional omnidirectional radiation from multiple sources via radially anisotropic zero-index metamaterials (RAZIM), as numerically and experimentally demonstrated in Cheng Q. et al., Phys. Rev. Lett., 108 (2012) 213903, lies in that the RAZIM shell confines all anisotropic cylindrical modes within the shell, while keeping transparent to isotropic cylindrical modes. From the illustrated underlying physics, it follows straightforwardly that it is impossible to use the RAZIM for generating perfectly coherent isotropic radiation in a three-dimensional free space, contrary to the claim made in the above-mentioned reference.
PACS: 41.20.Jb – Electromagnetic wave propagation; radiowave propagation / 42.25.Bs – Wave propagation, transmission and absorption / 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
© EPLA, 2012
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