Space-coiling metamaterials with double negativity and conical dispersion
Open Access
- 8 April 2013
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 3 (1), srep01614-6
- https://doi.org/10.1038/srep01614
Abstract
Metamaterials are effectively homogeneous materials that display extraordinary dispersion. Negative index metamaterials, zero index metamaterials and extremely anisotropic metamaterials are just a few examples. Instead of using locally resonating elements that may cause undesirable absorption, there are huge efforts to seek alternative routes to obtain these unusual properties. Here, we demonstrate an alternative approach for constructing metamaterials with extreme dispersion by simply coiling up space with curled channels. Such a geometric approach also has an advantage that the ratio between the wavelength and the lattice constant in achieving a negative or zero index can be changed in principle. It allows us to construct for the first time an acoustic metamaterial with conical dispersion, leading to a clear demonstration of negative refraction from an acoustic metamaterial with airborne sound. We also design and realize a double-negative metamaterial for microwaves under the same principle.Keywords
This publication has 39 references indexed in Scilit:
- Experimental realization of three-dimensional indefinite cavities at the nanoscale with anomalous scaling lawsNature Photonics, 2012
- Optical Metamaterials—More Bulky and Less LossyScience, 2010
- Three-dimensional optical metamaterial with a negative refractive indexNature, 2008
- Optical negative-index metamaterialsNature Photonics, 2007
- Tunneling of Electromagnetic Energy through Subwavelength Channels and Bends using-Near-Zero MaterialsPhysical Review Letters, 2006
- Propagation in and scattering from a matched metamaterial having a zero index of refractionPhysical Review E, 2004
- Overcoming the Diffraction Limit with a Planar Left-Handed Transmission-Line LensPhysical Review Letters, 2004
- Electromagnetic Wave Propagation in Media with Indefinite Permittivity and Permeability TensorsPhysical Review Letters, 2003
- Experimental Verification of a Negative Index of RefractionScience, 2001
- Negative Refraction Makes a Perfect LensPhysical Review Letters, 2000