Interaction of light with metallic nanohole arrays

In this work we study the way light interacts with thin gold films perforated with periodic arrays of holes with diameter smaller than the wavelength of the incident light. This structure exhibits sharp peaks in transmission spectra, at wavelengths larger than the array period, with efficiencies of orders of magnitude greater than predicted by standard aperture theory. The effect is highly dependent upon the structural film parameters like hole diameter and film thickness.     

宋末元初江西爱国词人群体论略

宋末元初的江西爱国词人们在抗元爱国的旗帜下,通过互相酬唱结成群体。该群体通过他们爱国、伤国、思国的词作,关注现实的词论以及豪放与婉约共存的词风来表达对亡国的历史反思,张扬并怀念故国的爱国情怀。     

辛弃疾的谐谑词新探

前人多注意到辛弃疾的"悲歌慷慨"与"委婉清丽"两类词,对诙谐戏谑一类的作品则较少留意。辛弃疾这类谐谑词或自嘲,或讽世,多倾注着诚挚的情思,别具一种深沉和庄重。     

Structural, electronic, optical and thermodynamic properties of SrxCa1−xO, BaxSr1−xO and BaxCa1−xO alloys

The structural, electronic, optical and thermodynamic properties of Sr_xCa_1−xO, Ba_xSr_1−xO and Ba_xCa_1−xO ternary alloys in NaCl phase were studied using pseudo-potential plane-wave method within the density functional theory. We modeled the alloys at some selected compositions with ordered structures described in terms of periodically repeated supercells. The dependence of the lattice parameters, band gaps, dielectric constants, refractive indices, Debye temperatures, mixing entropies and heat capacities on the composition x were analyzed for x = 0, 0.25, 0.50, 0.75 and 1. The lattice constant for Sr_xCa_1−xO and Ba_xSr_1−xO exhibits a marginal deviation from the Vegard's law, while the Ba_xCa_1−xO lattice constant exhibits an appreciable upward bowing. A strong deviation of the bulk modulus from linear concentration dependence was observed for the three alloys. The microscopic origins of the gap bowing were detailed and explained. The composition dependence of the dielectric constant and refractive index was studied using different models. The thermodynamic stability of these alloys was investigated by calculating the phase diagram. The thermal effect on some macroscopic properties was investigated using the quasi-harmonic Debye model. There is a good agreement between our results and the available experimental data for the binary compounds which may be a support for the results of the ternary alloys reported here for the first time.     

Spectroellipsometric assessment of HfO2 thin films

Present paper looks into the possibilities and limitations of near ultraviolet-visible range spectroscopic ellipsometry in investigating HfO₂ thin films (thickness < 7 nm). The “high k” dielectric films were produced by Atomic Layer Deposition—ALD, sputtering, and Metalo-Organic Chemical Vapour Deposition—MOCVD, on silicon and on silicon/silicon dioxide structures. Using a simple optical model (Cauchy dispersion, with an Urbach absorption tail), suitable for the optical range investigated, we extract the thickness of the layers and their optical constants. Results related to the optical properties show the important impact made by the initial surface and the growth/deposition procedure. It is also shown that for the case of ALD HfO₂ films grown on RTO oxides a significant increase in the absorption coefficient is recorded in the 4.7-5.15 eV range; this can be linked with the formation of defects related to oxygen vacancies. Subsequent anneal cycles performed in oxygen reveal that changes do occur both at the transition layer level, and in the structure of the HfO₂ film, for which an increase in the absorption is recorded.     

The 3D Amlouk-Boubaker expansivity-energy gap-Vickers hardness abacus: A new tool for optimizing semiconductor thin film materials

In this study, we propose a new abacus based on a synthetic parameter: the Amlouk-Boubaker expansivity ψ_AB. This abacus gathers the band gap energy E_g., Vickers microhardness and ψ_AB. This abacus is presented as a guide to evaluate and optimize photovoltaic-thermal semiconductor thin films thermal and optical performance. The definition of this parameter ψ_AB takes into account the thermal diffusivity and the optical effective absorptivity of the material. As a first approximation, this parameter, could be considered as a 3D velocity of the transmitted heat inside the material.New functional semiconductor materials have been significantly classified using this abacus.     

Determination of optical constants of thin films from transmittance trace

A simple method is depicted in this communication to determine the optical constants of transparent thin films from transmittance versus wavelength traces, showing no fringes, for evaluating thickness. The strength of this technique is apparent when applied to Zn_1 − xMg_xO films.     

明人选明词二种考论

明人选编的明代词选,一为万历年间钱允治选编的《国朝诗馀》,二为天启末年至崇祯初年沈际飞在《国朝诗馀》基础上改编而成的《草堂诗馀新集》。文章对《国朝诗馀》存在的问题,《草堂诗馀新集》的成书时间与主要成就作了具体深入的考证与论述。     

论李煜词的艺术特征

李煜词以本色的语言真实地记录了他亡国前后的生活与心境,并以真挚的情感和感伤的风格塑造出具体而生动的艺术形象,具有独特的不可抗拒的魅力。     

本质安全电气设备中R_i、L_i和C_i参数测试分析

通过对本质安全电气设备中Ri、Li和Ci参数的理论分析,探讨性提出了一种间接测试方法.