In this paper, a periodic chain composed of two-dimensional dielectric cylindrical inclusions was studied based on the Fourier series expansion method with perfectly matched layers. Phase and attenuation constants associated with guided modes, forward propagation leaky modes, and backward propagation leaky modes, were conceptually proposed and numerically examined. In particular, the relationships between the backward propagation mode, leaky mode, and propagation constant were explained in the second-order Bragg reflection region. This simple structure was investigated with the goal of realizing an efficient guiding device. Phase and attenuation constant results were compared with the results obtained using the Lattice Sums technique with the T-matrix approach and FDTD method; very good agreement was observed between these methods.

Abstract:The Terahertz (THz) technology field is currently a popular scientific topic. In this paper, the transmission characteristics of two coupled planar transmission lines (microstrip-double slot and double microstrip-slot coupled lines) are investigated via odd-mode excitation and even-mode excitation in the THz band. Furthermore, we study the attenuation constant and the effective refractive index of the two transmission lines under investigation. We have compared the propagation characteristics of THz pulses on microstrip-lines and coplanar strip-lines; we find very good agreement between the observed results.

The study on terahertz radiators will not only boost the development of theoretical research, but also raise severe challenges to solid-state electronics and circuit technology. In the present paper, the transmission characteristics of microstrip-slot coupling structures are primarily studied in 1-3THz band.Based on the single-layer dielectric structure, a double-layer dielectric microstrip-slot coupling structure with air as one layer is presented. It is reported that adding air layer based on the single-layer structure helps reduce the loss. Besides, given the factors of Engineering processing, the structure of three-layer media is also proposed; it is found that the structure of three-layer media still has exhibits transmission loss when the engineering realization is satisfied. However, this study suggests that the loss of the three-layer structure is higher than that of the two-layer structure, whereas the effect is better than that of the single-layer structure.INDEX TERMS Terahertz, multilayer structure, transmission characteristics, odd mode, even mode.

We report the voltage regulation of electrodeposited elliptical magnetostrictive Ni nanodot arrays from single-domain to nonvolatile vortex state at room temperature. On the piezoelectric substrate, isolated elliptical Ni nanodots are fabricated between a pair of square electrodes, with the long axis parallel to the joint line of the electrodes. By applying a voltage to the surface electrodes pair, local stress is generated to induce the magnetization of the nanodots from single-domain to vortex state. The magnetization state of the nanodots is characterized by a magnetic force microscope. Even after the voltage is removed or applying another voltage, the nanodots maintain a stable vortex magnetization state, which shows that the vortex state after regulation is nonvolatile. These results are of great significance for the study of the low-energy-consumption regulation of the nano-dimensional magnetic material and vortex state-based nonvolatile memory.

Herein, we have developed a deliciated smooth edge curve compensation method for circular display, thorough BM mask design and arc angel regulation. This significantly alleviates the jagged mura at the rounded corners of the panel. More importantly, the circular GOA circuits exhibit a wide margin of 20 V after high-temperature and high-humidity storage for 500 h.