146 research outputs found
Pure nonlinear optical activity in metamaterials
We demonstrate a type of meta-atom for creating metamaterials with giant nonlinear optical activity but vanishing linear optical activity in a wide frequency range. Such properties are not found in any natural materials, and we call this regime as pure nonlinear optical activity. We further extend our design concept and show that the metamaterial can be tuned dynamically to exhibit either positive or negative polarization rotation.The work was supported by the
Australian Research Council through Discovery Projects
scheme
Enhanced parametric processes in binary metamaterials
We suggest double-resonant (binary) metamaterials composed of two types of
magnetic resonant elements, and demonstrate that in the nonlinear regime such
metamaterials provide unique possibilities for phase-matched parametric
interaction and enhanced second-harmonic generation
Multistability in nonlinear left-handed transmission lines
Employing a nonlinear left-handed transmission line as a model system, we
demonstrate experimentally the multi-stability phenomena predicted
theoretically for microstructured left-handed metamaterials with a nonlinear
response. We show that the bistability is associated with the period doubling
which at higher power may result in chaotic dynamics of the transmission line
Giant Goos-Hanchen effect at the reflection from left-handed metamaterials
We study the beam reflection from a layered structure with a left-handed
metamaterial. We predict a giant lateral (Goos-Hanchen) shift and splitting of
the beam due to the resonant excitation of surface polaritons with a
vortex-like energy flow between the right- and left-handed materials
Double-nonlinear metamaterials
We study a double-nonlinear metamaterial composed of a mixture of both nonlinear electric and nonlinear magnetic resonators. We predict multistable behavior in such metamaterial with the possibility to control the effective index of refraction by the electromagnetic field intensity. In contrast to the structure with just one type of nonlinear inclusions, our composite material may switch properties between the transparent negative index and the transparent positive index regimes.Authors would like to acknowledge the support
from the Australian Research Council, from the National
Natural Science Foundation of China Grant No. 60878008,
from the New Teacher Foundation of Ministry of Education
of China Grant No. 200801081014, and from the Natural
Science Foundation of Shanxi Province Grant No.
2008012002-1
Tunable split-ring resonators for nonlinear negative-index metamaterials
We study experimentally the dynamic tunability and self-induced nonlinearity
of split-ring resonators incorporating variable capacitance diodes. We
demonstrate that the eigenfrequencies of the resonators can be tuned over a
wide frequency range, and significantly, we show that the self-induced
nonlinear effects observed in the varactor-loaded split-ring resonator
structures can appear at relatively low power levels.Comment: 6 pages, 4 figure
Surface Bloch waves in metamaterial and metal-dielectric superlattices
We study the properties of electromagnetic Bloch waves in semi-infinite
periodic structures created by alternating metamaterial and dielectric layers.
We derive and analyze the dispersion relations in the long-wavelength limit for
both TE- and TM-polarized surface Bloch modes, for magnetic metamaterials with
negative refraction and metal-dielectric plasmonic superlattices. We reveal
that in the subwavelength regime the bulk modes are characterized by three
different refractive indices ("tri-refringence") while the surface modes can
propagate parallel to the Bloch wavevector and along the interface between
superlattice and semi-infinite dielectric.Comment: 4 pages, 4 figure
Nonlinear guided waves and symmetry breaking in left-handed waveguides
We analyze nonlinear guided waves in a planar waveguide made of a left-handed
material surrounded by a Kerr-like nonlinear dielectric. We predict that such a
waveguide can support fast and slow symmetric and antisymmetric nonlinear
modes. We study the symmetry breaking bifurcation and asymmetric modes in such
a symmetric structure. We analyze nonlinear dispersion properties of the guided
waves, and show that the modes can be both forward and backward.Comment: 4 pages, 3 figure
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