Cheng, YongzhiYang, DongruLi, Xiangcheng
8页查看更多>>摘要：In this paper, a broadband reflective dual-functional polarization convertor based on all-metal anisotropic metasurface was proposed and investigated numerically in visible region. The unit-cell of the all-metal anisotropic metasurface based polarization convertor is composed of the Au ellipse nanostructure adhered on an Au substrate. The proposed anisotropic metasurface can convert the incident linear polarization light into its orthogonal counterpart or circular polarization light by adjusting the geometric parameter of the ellipse nano structure. When the all-metal anisotropic metasurface functioned as a linear-to-linear polarization convertor (LLPC), the conversion efficiency is over 90% operating from 356.5 THz to 536.5 THz. While the metasurface served as a linear-to-circular polarization convertor (LCPC), the absolute value of polarization extinction ratio (PER) is greater than 10 dB from 336.5 THz to 544.5 THz. The simulated electric field distributions on the unit cell indicate that the higher polarization converion efficiency is mianly originated from the geometry anistropy and excitations of fundamental and higher-order dipolar plasmon resonance. Thus, our design can be found potential applications in many areas, such as remote nano-sensors, nano-antennas, and radiometers in visible region.
原文链接:
NSTL
Elsevier
Choe, Yong-SuKang, Chol-Jin
5页查看更多>>摘要：The electrostatic potentials (ESPs) of the dynamic charge densities of cubic and orthorhombic LiMn2O4 phases have been analyzed by using the structure factors calculated accurately from the independent atom model (IAM). The variations of the ESPs have been considered through two-dimensional contour maps in the planes perpendicular to the a, b and c axes. We have found 24 open channels with negative ESP values that Li (+) ion migration is possible along the [110], [1 (1) over bar0], [011], [01 (1) over bar], [101], [(1) over bar 01] directions in a cubic unit cell. Each channel is much wider than known radius of Li+ ion and the interior of it reveals the lowest level of the ESP and variation smaller than 0.3e/angstrom. One channel contains two linear chains and a Li+ ion is located at three-dimensional six channels. The ESP distributions suggest that Li (+) ion migration in cubic LiMn2O4 occurs not along the linear chain directions of Li (+) ions, but along the central axes of channels. These axes can be considered as possible Li+ ion migration pathways during charge/discharge. Although the orthorhombic LiMn2O4 phase has also similar Li (+) ion chains, because of much more variation of the ESP in spatial regions along the corresponding directions, it can be expected that its ionic conductivity decreases.
原文链接:- NSTL
- Elsevier
Pat, SuatMohammadigharehbagh, RezaOzgur, Nihan AkkurtOztetik, Betul...
10页查看更多>>摘要：In this work, WO3-TiO2 nanocomposite thin films were deposited via thermonic vacuum arc technique and the physical and electrochemical features of these nanocomposites were investigated. The average transmittance values were obtained 66.9% and 58.7%, particularly the mean absorbance values were 0.49 and 0.59 onto ITO and FTOcoated glass substrate. The optical band gap of the layers were calculated 2.59 and 2.62 eV upon ITO and FTO coated glass substrates, respectively. Measurement outputs show that both coated thin films are conductive and good storage capabilities for Li+ ions. The reversibility of the films is calculated at 7% and 15% on ITO coated glass and FTO coated glass substrates, respectively. Considering that WO3 and TiO2 materials separately show high quality electrochromic properties, it is aimed to produce these two materials as composites and to examine their electrochromic properties using different producing techniques.
原文链接:- NSTL
- Elsevier
