Jinping Tian

Optical Properties of a Y-Splitter Based on Hybrid Multilayer Plasmonic Waveguide

A Y-splitter based on hybrid multilayer plasmonic waveguide structure composed of silver–silica–silicon–silica–silver is introduced. Properties, such as the transmission rate and split ratio, are numerically investigated by changing the thickness of dielectric layers, bending radii of the bending parts, as well as input working wavelength. Results indicate that the proposed structure can have high transmission rates of >47% at the two output branches with split ratio close to 1:1. When the symmetry of the structure is broken by adjusting the bending radii of the bending parts, one may control the transmission rate of the two different output branches and then control the split ratio for a given working wavelength to a certain degree. Comparison reveals that the proposed Y-splitter is superior to the T-splitter within the wavelength range of 1000–1600 nm. These properties are helpful in the design and application of photonic devices and integration.

Exact dipole solitary wave solution in metamaterials with higher-order dispersion

Abstract We present an exact dipole solitary wave solution in a mutual modulation form of bright and dark solitons for a higher-order nonlinear Schrödinger equation with third- and fourth-order dispersion in metamaterials (MMs) using an ansatz method. Based on the Drude model, the formation conditions, existence regions and propagation properties are discussed. The results reveal that the solitary wave may exist in a few parameter regions of MMs, different from those in optical fibres, and its propagation properties can be controlled by adjusting the frequency of incident waves in each existence region.

Polarization-Controlled and Flexible Single-/Penta-Band Metamaterial Absorber

In this paper, a polarization-controlled and flexible metamaterial absorber made of a set of wires etched on ultrathin teflon dielectric substrate is proposed. The simulation results showed that the proposed absorber achieved single-band absorptivity of 99.8% at 6.64 GHz for the TM (transverse magnetic) polarization wave and penta-band absorptivity of more than 99% at 11.68 GHz, 13.58 GHz, 15.48 GHz, 17.38 GHz, and 19.28 GHz for the TE (transverse electric) polarization waves. Moreover, each absorption peak had very narrow relative bandwidth and the position of penta-band absorption peaks could be adjusted by changing the length of the corresponding wire or selecting suitable substrate material according to actual requirements, because each wire can independently respond to electromagnetic (EM) waves. Furthermore, the surface current distributions corresponding to each absorption peak were studied to demonstrate the absorption mechanism. The absorption properties of the proposed structure with different bending radii and under different incident angles of the EM waves were investigated, showing good flexibility and incident angle-insensitive properties. In addition, the simulation results were confirmed by measuring a fabricated prototype. The proposed absorber may have useful applications in polarizers, sensors, bolometers, polarization detectors, etc.