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Functional metamaterials provide useful properties for the design of electromagnetic devices. In this work we demonstrate that functions including high nonlinearity and amplification can be included in metamaterials to realize time reversal imaging.
Polarization conversion of metal-helix based metamaterials can be eliminated by recovering four-fold rotational symmetry. Symmetry considerations and current progress in the fabrication of N-helix optical metamaterials as broadband circular polarizers is presented.
We report the experimental implementation of a bulk metamaterial with an all-angle left-handed response in the ultraviolet. Using this metamaterial, we fabricate an optically switchable Veselago flat lens capable of imaging arbitrary two-dimensional objects beyond the near field.
We demonstrate dispersion control of near-infrared surface plasmon polariton by tuning the filling fraction of a multilayer metallo-dielectric hyperbolic metamaterial. We show that effective medium approximation accurately provides the dispersion behavior for a structure with only 2.5 periods.
We demonstrate a new type of electrically tunable strong coupling between a planar metamaterial layer and an ultra-thin epsilon-near-zero layer made of a doped semiconductor. This can find novel applications in chip-scale infrared optoelectronic devices.
We demonstrate ultrafast optical control of near field coupled metamaterial resonances. We observed dynamical transition of the metamaterial resonances to change its state from coupled to decoupled, and back to the coupled state under photoexcitation.
We present ultra-strong light-matter interaction of a metamaterial mode and an intersubband transition for normal incidence radiation in the mid-infrared spectral region. The anti-crossed lines show a splitting of 15% of the central frequency.
We show that Förster energy transfer is inhibited in the vicinity of hyperbolic metamaterials and metals — the environments, which enhance spontaneous emission rates. The effect is attributed to high local densities of photonic states.
We combine direct laser writing with electron-beam lithography to fabricate arrays of 3D tapered gold double-helices with feature sizes well below 100 nm, enabling chiral metamaterials and helical nanoantennas at telecom frequencies.
We present some of the recent projects at CINT that aim at active, tunable and nonlinear metamaterials. This is achieved by combining far and mid infrared planar metamaterials with semiconductors, superconductors and other materials.
Ohmic losses severely limit the performance of metamaterials. High-index semiconductors offer an attractive alternative. We review several meta-surfaces based on silicon and silicon carbide enabling infrared applications such as polarization manipulation and thermal emission.
Metamaterials with hyperbolic dispersion (where two eigenvalues of the dielectric permittivity tensor have opposite signs) exhibit a broad bandwidth singularity in the photonic density of states, with resulting manifestations in a variety of phenomena, from spontaneous emission to light propagation and scattering. In this tutorial, I will review some of the recent developments in this field.
We propose a hyperbolic metamaterial waveguide to realize a highly efficient rainbow trapping effect, which can be used to develop practical on-chip optical super absorbers with a tunable absorption band.
We present an experimental demonstration of an optical metamaterial with a nearly isotropic low-index response, leading to angular selectivity of transmission and enhanced directive emission from quantum dots placed within the metamaterial.
We fabricated an electrically tunable metamaterial based on twisted nematics liquid crystal cell, where polarization dependent reflectance of the metamaterial can be controlled via applied voltage. When the metamaterial-twisted nematics liquid crystal cell is driven with a voltage above the threshold, optical reflection of the cell has changed. Our result provides the possibility of tuning the frequency...
We proposed a geometric extension of transformation optics based on nonholonomic coordinate transformation. Torsion arose from change of topology can manipulate the twisting degree of freedom.
We propose an optical lens that focuses light from all angles of incidence to a singular point based on a lossy anisotropic ε-near-zero metamaterial. Full-wave numerical simulations are carried out with realistic material properties.
A composite right/left-handed metamaterial waveguide for terahertz quantum-cascade lasers is presented. Left handed (backward wave) propagation is confirmed by using the waveguide as a leaky-wave antenna where directional beams at angles of −4° and −63° are experimentally observed at excitation frequencies 2.59 and 2.48 THz, respectively.
Epitaxially grown TiN/Al0.6Sc0.4N superlattice behaves as a hyperbolic metamaterial (HMM) in the visible range. Since HMMs enhance photonic-density-of-states and reduce lifetime of an emitter, we observed nine times decrease in lifetime of a dye molecule placed close to this HMM.
We introduce graphene-based hyperbolic metamaterial for terahertz frequencies. The LDOS as well as the scattered power by a microsphere at its surface are enhanced by orders of magnitude, and controlled via chemical potential.
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