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We study a dual-band asymmetric transmission in a multi-layered chiral metamaterial in the terahertz (THz) regime. The chiral metamaterial is composed of stacked five layers and each metallic layer of sandwiched between two dielectric layers. The simulated results show that the multi-layered chiral metamaterial can achieve dual-band cross-polarization conversion with an efficiency of over 35% for...
The processing of photonic information strongly depends on electronic technique, which limits the speed of information processing. Fortunately, modulation of light with light based on metamaterials creates a new approach to realize photoelectric devices and modulation of photonic information. In this work, we present a tunable broadband polarization conversion based on coherent control, which makes...
We present dual-band metamaterial absorbers that are composed of concentric metal double rings, a dielectric spacer and a metallic ground plane. The coupling between the top electric resonators and the bottom metal layer leads to a strong magnetic resonance. The metamaterial with ordered double rings has two absorption peaks at frequencies of 5.67 GHz and 11.30 GHz with the absorption rates of 99...
Spiking cortical model (SCM) is applied to image segmentation. A natural image is processed to produce a series of spike images by SCM, and the segmented result is obtained by the integration of the series of spike images. An appropriate maximum iterative times is selected to achieve an optimal threshold of SCM. In each iteration, neurons that produced spikes correspond to pixels with an intensity...
Control of polarization of light with light is demonstrated in thin slabs of linear material promising ultrafast all-optical data processing at arbitrarily low intensities. In proof-of-principle experiments we access any polarization azimuth and any ellipticity.
We theoretically and numerically propose a kind of planar chiral metamaterial which consists of two layers of connected I-shape resonators arranged by a twist angle of 90°. Numerical simulation results show that our scheme can realize a polarization conversion for linearly polarized waves.
We investigate transmission characteristics in planar multiple-ring metamaterials theoretically and discuss the interaction mechanism between the rings. The microwave multiple-ring metamaterials are used to study electromagnetically induced transparency (EIT) and the Fano-type response to incident electromagnetic waves. The dark mode resonant feature results from the excitation of an antisymmetric...
We review our recent work on trapped-mode resonances in planar metamaterials and stereometamaterial. The excitation of the Fano-type trapped-mode resonance can be controlled via angles of incidence and polarizations. The stereometamaterial consisting of asymmetrical molecules has an intrinsic chirality and can be used as a multiband polarization spectral filter.
We show that a kind of chiral bilayered metamaterial exhibits asymmetric transmission for linearly polarized electromagnetic waves propagating through it in two opposite directions. Calculations indicate that the asymmetric transmission can be tuned by varying the slit width. The proposed metamaterial can function as a perfect transparent polarization transformer at certain frequencies.
We studied highly trapped-mode resonant feature in planar positive and negative metamaterials with broken symmetry theoretically. The transmission and reflection spectra of the metamaterials have been used to show resonant response to the incident electromagnetic wave under normal incidence and the quality factor is strongly dependent on geometrical parameters of metamaterials.
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