排序方式: 共有39条查询结果,搜索用时 15 毫秒
11.
Snell定律揭示了光在穿越不同介质界面时的传播和折射规律,这是现代物理光学的重要基础。追求完美光学透镜的途径之一是寻找正负折射率匹配材料,但在相当长时期内,在自然界中从未发现有违背Snell定律的天然负折射率材料存在。在本研究工作中制备了一系列入射角精确可控的楔形贵金属金和银等样品,采用不同波长的激光,对于光在最简单的天然贵金属界面传播时所发生的由负到正折射特性变化进行了定量实验测量,获得表观折射率随入射和折射角变化的定量关系。对于导致奇异光折射现象的各种争议性机理进行了细致探索和讨论,这与等离子体、负磁导率和Goos-Hanchen等效应无关。研究结果将有助于人们理解光在金属基微结构中发生正负折射传播的物理机理,从而为新型微纳光电子材料和器件的研制和应用建立基础。 相似文献
12.
13.
14.
15.
16.
17.
Using e-beam evaporation, the ellipsometric parameters of thick transparent films are studied with the modified analysis method for the SiO 2 film samples deposited onto the Si substrate. The ellipsometric parameters are measured at the incidence angles changing from 50 to 70 and in the 3–4.5 eV photon energy range. The error in the conventional method can be significantly reduced by the modified ellipsometric method considering the spatial effect to show good agreement between the theoretical and experimental results. The new method presented in this letter can be applied to other optical measurement of the periodic or non-periodic film structures. 相似文献
18.
19.
20.
Nitrogen and Silicon Co-Doping of Ge2Sb2Te5 Thin Films for Improving Phase Change Memory Performance 下载免费PDF全文
Electrical properties and phase structures of (Si+N)-codoped Oe2Sb2Te5 (GST) for phase change memory are investigated to improve the memory performance. Compared to the films with N or Si dopants only in previous reports, the (Si+N)-doped GST has a remarkable improvement of crystalline resistivity of about 104mΩcm. The Fourier-transform infrared spectroscopy spectrum reveals the Si-N bonds formation in the film. X-ray diffraction patterns show that the grain size is reduced due to the crystallization inhibition of the amorphous GST by SiNx, which results in higher crystalline resistivity. This is very useful to reduce writing current for phase change memory applications. 相似文献