足球烯分子三阶非线性光学性质的研究

报道了有关足球烯分子甲苯溶液中简并四波混频实验.测量出足球烯C_(70)分子和C_(60)分子的三阶超极化率张量y_(1111)分量分别为1.2×10~(-30)esu和4.0×10~(-31)esu.对应于固体样品的三阶非线性光学系数X_(1111)分量分别是2.5×10~(-8)esu和8.5×10~(-9)esu.此结果表明了足球烯分子是现有的非线性光学材料中具有较大三阶非共振电子极化率材料之一.文中还利用自由电子模型解释了非线性光学极化率的起源.     

足球烯分子C_(60)及C_(70)的反饱和吸收性质与光限制效应

报道了对足球烯分子纯C_60及纯C_70的光限制效应的研究结果,讨论了样品的浓度及三重态寿命对光限制阈值的影响.首次报道在足球稀分子中发现的三重态吸收饱和现象,并阐述了其产生的原因及对光限制效应的影响.     

Laser Mode-Dependent Size of Plasma Zones Induced by Femtosecond Laser Pulses in Fused Silica

We carry out the numerical simulations of femtosecond laser propagation with TEMoo mode, TEM10 mode and a beam combining both the modes in fused silica. It is found that the transverse size of plasma zones induced by laser pulses with the TEM10 mode is smaller than that induced by the TEM00 mode, while the longitudinal size is almost the same, and the saturated plasma density is higher. The transverse size, the longitudinal size and the ratio of the longitudinal to transverse size, for the beam combining both the modes, all could be reduced at the same time in comparison with the TEM00 mode under the same focusing conditions.     

Green＇s function formalism in semi-infinite composites： an investigation of local field distribution

In the resonant composites, the formerly developed Green's function formalism (GFF) can be used to compute the local field distribution near resonance. In this paper, we extend the GFF in the infinite network to the semi-infinite networks by the method of image. Using the formalism, we investigate the local field distribution near resonance for the impurity clusters with admittance ε_0 embedded in one semi-infinite network with ε_1. With varying the admittance ε_2 of another semi-infinite network, we find that the local fields in the boundary experience great changes, especially at ε_2=-ε_1. The existence of the boundary enhances the localization of the fields within and around the metallic clusters. Therefore, the intensity of local field is influenced by the arrangement of impurity metallic bonds and its distance from the boundary.     

影响杂化钙钛矿太阳能电池稳定性的因素探讨

自从2009年首次报道采用有机-无机杂化钙钛矿作为吸光材料用于太阳能电池以来, 钙钛矿太阳能电池效率的快速提升引起了人们广泛的关注, 这类电池同时具有制备工艺简单、成本低廉等优点, 引发了钙钛矿电池的研究热潮. 目前研究工作大多数集中在如何提高电池的光电转化效率, 但钙钛矿电池要真正实现产业化应用, 急需要解决材料及器件的稳定性问题. 本文探讨影响钙钛矿材料及器件的稳定性因素, 从温度及湿度等方面分析了材料的稳定性, 从传输材料及其界面问题讨论了器件的稳定性.     

光学发展与社会进步

人从降生开始,光就伴随其一生。宇宙的发展也跟光的发展紧密联系在一起。光学的发展过程是人类认识客观世界进程中的一个重要组成部分,是不断揭露矛盾和解决矛盾,逐渐从不确切认知走向确切认知的过程。光学确实是无处不在的,太阳能的利用,蓝光的发光,激光的焊接和切割,电影的放映,光纤通信,光合作用,X光的应用和显微镜的应用等等。光学仪器已在人们日常生活中起着无可替代的作用。列举一个最熟悉的例子,我们每天都在使用的手机就使用了三十多项光学的技术：光学玻璃、激光切割光滑的玻璃表面、激光打标、OLED和液晶显示、挡光版、背光照明、实现彩色的偏振片和滤光片、增加清晰度的增透膜、照相的镜头、成像的CCD、芯片的制造、光刻技术的应用、通过光纤进行信息的传输、蓝牙无线红外通信、光纤传感和投影等。今天,我们将从光的过去、现在和未来几个方面来探讨光对我们的生活所起到的至关重要的影响。     

从光学显微镜到光学“显纳镜”

光学显微镜在生物学和医学等众多科学技术以及生产领域发挥着重要作用,分辨能力已经进入纳米尺度.本文综述了光学显微镜的放大原理、结构组成、发展历史、在生物学发展中的推动作用以及超越阿贝衍射极限实现超分辨荧光显微镜——光学显纳镜的原理和方法.光学显纳镜重点介绍了2014年获得诺贝尔化学奖的两项超分辨荧光显微技术,一是以光激活定位显微技术为代表的单分子显微技术,一是通过增加一束损耗光等效减小激发光斑大小来实现超分辨的受激发射损耗显微技术.     

A Scheme for Atomic Entangled States and Quantum Gate Operations in Cavity QED

We propose a scheme for controllably entangling the ground states of five-state W-type atoms confined in a cavity and realizing swap gate and phase gate operations. In this scheme the cavity is only virtually excited and the atomic excited states are almost not occupied, so the produced entangled states and quantum logic operations are very robust against the cavity decay and atomic spontaneous emission.     

微纳光子结构中光子和激子相互作用

微纳光子结构中超强的光场局域给光和物质相互作用带来了新的研究机遇.通过设计光学模式,微纳结构中的光子和激子可以实现可逆或者不可逆的能量交换作用.本文综述了我们近年来在微纳结构,尤其是表面等离激元及其复合结构中光子和激子在强弱耦合区域的系列研究工作,如高效可调谐及方向性的单光子发射,利用电磁真空构造增强光子和激子的耦合等.这些工作为微纳尺度上光和物质作用提供了新的物理内容,在芯片上量子信息过程及可扩展的量子网络构建中有潜在应用.     

Resonant Modes of L-Shaped Gold Nanoparticles

We analyze the electric field modes excited in resonant L-shaped gold nanoparticles using a finite-difference time domain method. Compared to a single gold nanorod, both the odd and even modes of the L-shaped nanoparticles can be excited due to the symmetry breaking. The nanoparticles with equal and unequal arms have different dependence of field enhancement and mode on the incident polarization.