分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhu, CT [Zhu, Chaoting][ 1 ]
Li, J [Li, Jia][ 1 ]
Yang, Y [Yang, Ye][ 1 ]
Lan, PJ [Lan, Pinjun][ 1 ]
Huang, JH [Huang, Jinhua][ 1 ]
Lu, YH [Lu, Yuehui][ 1 ]
Tan, RQ [Tan, Ruiqin][ 2 ]
Dai, N [Dai, Ning][ 3 ]
Song, WJ [Song, Weijie][ 1,4 ]
摘要： In this paper, Ga-doped ZnO (GZO) thin films are deposited on glass substrates by radio frequency magnetron sputtering for low loss plasmonic applications. The effects of Ga2O3 content in the target and substrate temperature on the electrical, structural and optical properties of GZO films are investigated. Film with the highest carrier concen- tration of 7.0 × 1020 cm− 3 was obtained at a Ga2O3 content of 5 wt% in the target under room temperature deposi- tion. With increasing deposition temperature, the lowest electrical resistivity of 3.8 × 10− 4 Ω cm was acquired at a deposition temperature of 200 °C. The values of plasmonic resonances wavelength could be changed from 1.35 to 2.39 μm by adjusting the carrier concentration. Material absorption losses in these GZO films are 10 times lower than that of conventional Ag films at telecommunication wavelengths. These results make GZO a promising low-loss plasmonic material operating at telecommunication wavelengths.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhang, XP [Zhang, Xianpeng][ 1 ]
Lan, PJ [Lan, Pinjun][ 1 ]
Lu, YH [Lu, Yuehui][ 1 ]
Li, J [Li, Jia][ 1 ]
Xu, H [Xu, Hua][ 2 ]
Zhang, J [Zhang, Jing][ 1 ]
Lee, Y [Lee, YoungPak][ 3,4 ]
Rhee, JY [Rhee, Joo Yull][ 5 ]
Choy, KL [Choy, Kwang-Leong][ 6 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： In the preliminary design process of switched reluctance machine (SRM), adjusting the number of wingding turns or cross-sectional area of conductor to optimize windings design has dramatic effects on the performances like torque density, efficiency and thermal dissipation and so on. However, the difficulty exists on how to guarantee these performances while optimizing winding design. This paper proposes an analytical optimization design method based on an regulation model of ampere density and coil space factor, which can directly determine the optimal number of winding turns, the cross- sectional area of conductor, the ampere density and the coil space factor. And a MATLAB pre-design program has been developed to provide two design schemes respectively with and without the optimization model. The comparison analysis has been further carried out with finite element analysis (FEA). The simulation results verify that the performances can be highly improved with the proposed optimization model.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhang, XP [Zhang, Xianpeng][ 1 ]
Lan, PJ [Lan, Pinjun][ 1 ]
Lu, YH [Lu, Yuehui][ 1 ]
Li, J [Li, Jia][ 1 ]
Xu, H [Xu, Hua][ 2 ]
Zhang, J [Zhang, Jing][ 1 ]
Lee, Y [Lee, YoungPak][ 3,4 ]
Rhee, JY [Rhee, Joo Yull][ 5 ]
Choy, KL [Choy, Kwang-Leong][ 6 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Antireflection (AR) coatings that exhibit multi- functional characteristics, including high transparency, robust resistance to moisture, high hardness, and antifogging proper- ties, were developed based on hollow silica−silica nano- composites. These novel nanocomposite coatings with a closed-pore structure, consisting of hollow silica nanospheres (HSNs) infiltrated with an acid-catalyzed silica sol (ACSS), were fabricated using a low-cost sol−gel dip-coating method. The refractive index of the nanocomposite coatings was tailored by controlling the amount of ACSS infiltrated into the HSNs during synthesis. Photovoltaic transmittance (TPV) values of 96.86− 97.34% were obtained over a broad range of wavelengths, from 300 to 1200 nm; these values were close to the theoretical limit for a lossy single-layered AR coating (97.72%). The nanocomposite coatings displayed a stable TPV, with degradation values of less than 4% and 0.1% after highly accelerated temperature and humidity stress tests, and abrasion tests, respectively. In addition, the nanocomposite coatings had a hardness of approximately 1.6 GPa, while the porous silica coatings with an open-pore structure showed more severe degradation and had a lower hardness. The void fraction and surface roughness of the nanocomposite coatings could be controlled, which gave rise to near-superhydrophilic and antifogging characteristics. The promising results obtained in this study suggest that the nanocomposite coatings have the potential to be of benefit for the design, fabrication, and development of multifunctional AR coatings with both omnidirectional broadband transmission and long-term durability that are required for demanding outdoor applications in energy harvesting and optical instrumentation in extreme climates or humid conditions.
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