Resonant dielectric metamaterials
View Patent ↗A resonant dielectric metamaterial comprises a first and a second set of dielectric scattering particles (e.g., spheres) having different permittivities arranged in a cubic array. The array can be an ordered or randomized array of particles. The resonant dielectric metamaterials are low-loss 3D isotropic materials with negative permittivity and permeability. Such isotropic double negative materials offer polarization and direction independent electromagnetic wave propagation.
1. A resonant dielectric metamaterial, comprising:
a dielectric matrix;
a first set of dielectric particles embedded in the matrix, each particle of the first set being substantially identically shaped and having a substantially identical permittivity, the particles in the first set having a dielectric constant that is higher than the dielectric constant of the matrix; and
a second set of dielectric particles embedded in the matrix, the second set being substantially identically shaped and having a substantially identical permittivity, the particles in the second set having a dielectric constant that is higher than the dielectric constant of the matrix and a permittivity that is different from the permittivity of the particles in the first set; and
wherein the dielectric particles in the first and second sets are arranged in cubic array and wherein the dielectric particles in the first or second set comprise an alumina-, zirconia-, or titania-based ceramic.
2. The resonant dielectric metamaterial of claim 1 , wherein the cubic array comprises an ordered array of NaCl-like unit cells.
3. The resonant dielectric metamaterial of claim 1 , wherein the cubic array comprises a randomized array.
4. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles comprise a dielectric sphere.
5. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles comprise a dielectric disk, cube, cylinder, tetrahedron.
6. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles have a cross-sectional dimension of less than two millimeters.
7. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles are spaced less than five millimeters apart.
8. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles in the first or second set comprise Mg 0.95 Ca 0.05 TiO 3 or (Zr x Sn 1-x )TiO 4 .
9. The resonant dielectric metamaterial of claim 1 , wherein the dielectric particles in the first or second set comprise Al 2 O 3 , Ba[Sn x (Mg 0.33 Ta 0.67 ) 1-x ]O 3 , Ba(Zn 0.33 Ta 0.67 )O 3 , Ba(Mn 0.33 Ta 0.67 )O 3 , ZrO 2 , (Y x Zr 1-x )O 2 , (Ce x Zr 1-x )O 2 , Ba 2 Ti 9 O 22 , CaTiO 3 —NdAlO 3 , BaNd 2 Ti 4 O 12 , (Ba,Pb)Nd 2 Ti 4 O 12 , TiO 2 , CaTiO 3 , or SrTiO 3 .