负折射率材料对隐失波的幅度增益

分析了隐失波透过负折射率材料制成的透镜时,可以实现相位的调整,从而实现波的聚焦的原理;另外利用叠加原理(干涉法)及场量匹配法分析了负折射率材料如何实现对隐失波的振幅的放大,得到负折射率材料对隐失波有幅度增益,行波和隐失波都能聚焦成像的结论;并利用传输线理论提出隐失波透过负折射率材料平板时可等效地形成一个LC振荡电路,从而实现对隐失波的幅度增益.     

可调谐一维特异材料(Metamaterial)的微波传输性质

利用变容二极管制作了可调谐一维左右手组合材料.并对其进行了传输系数测量.实验发现当电压升高时，左手通带将向高频方向移动，而禁带的终止频率保持不变.基于微波传输线理论，给出了这种左右手组合材料的色散方程，实验曲线与理论曲线能够很好地符合. 关键词： 调谐 特异材料 传输系数 变容二极管     

非常偏振光在单轴晶体表面的全反射分析

利用透射波函数和由菲涅尔公式求解反射相位差并对其求导的方法,分析了非常偏振光在单轴晶体表面发生的全反射现象,求解出晶体光轴在入射面内时,非常偏振光从各向同性介质入射到晶体和从晶体出射到各向同性介质两种情况的隐失波穿透深度和Goos-Hnchen位移的一般表达式。通过计算机模拟给出了单轴晶体为方解石和水晶情况时的穿透深度和Goos-Hnchen位移图像。结果表明,对于不同的晶体,光轴的取向对穿透深度和Goos-Hnchen位移的影响是明显不同的,若选取合适的晶体、光轴取向和入射角,可以得到较大的隐失波穿透深度和Goos-Hnchen位移。     

光波在左右手系材料界面处的传输特性

根据电磁场理论推导了左、右手系材料界面处菲涅耳公式及菲涅耳系数的角度表达形式,研究了界面处反射系数和透射系数的变化情况,以及布鲁斯特角的确定和全反射时的光学特性,作为进一步研究左手系的特性和相关光学薄膜器件设计的理论基础.     

非线性左右手媒质界面的Goos-H(a)nchen位移

由均匀平面电磁波在左右手媒质界面满足的切向边界条件出发,推导了电磁波由线性传统媒质入射到非线性左手媒质时波的传播特性.利用时间延迟的方法,给出全反射情况下媒质界面非线性Goos-Hǎnchen位移表达式.分析了非线性左手媒质界面的侧向位移随入射角及入射波电场强度的变化关系,发现入射波场强对传输特性起决定作用:当入射波电场小于临界场强时,调节入射场强可以控制相应的侧向位移;当入射波电场大于临界场强时,不再满足全反射条件,部分入射波透射到非线性介质中.波导中加入非线性介质不仅可以调节侧向位移的大小,且可以实现对入射波场强的控制.     

非线性左右手媒质界面的Goos-Hänchen位移

 由均匀平面电磁波在左右手媒质界面满足的切向边界条件出发,推导了电磁波由线性传统媒质入射到非线性左手媒质时波的传播特性。利用时间延迟的方法,给出全反射情况下媒质界面非线性Goos-Hänchen位移表达式。分析了非线性左手媒质界面的侧向位移随入射角及入射波电场强度的变化关系,发现入射波场强对传输特性起决定作用:当入射波电场小于临界场强时,调节入射场强可以控制相应的侧向位移;当入射波电场大于临界场强时,不再满足全反射条件,部分入射波透射到非线性介质中。波导中加入非线性介质不仅可以调节侧向位移的大小,且可以实现对入射波场强的控制。     

光的全反射探究式教具及光控音响的制作

针对现有光的全反射教具的不足,采用简易材料设计并制作了光的全反射探究式教具、全反射水槽及光控音响,该教具演示效果好,操作性强.     

电磁波在左右手介质界面折射与反射特性的研究

研究了电磁波在左右手介质界面折射与反射的特性,给出了折射系数和反射系数,从另外一个方面探讨了最小作用量原理在左手材料中的适用性;从电动力学和最小作用量原理证明了Snell定律,验证了Snell定律在左手材料中的适用性,并且得到Fresnell公式在左右手材料中的一致性.     

干涉法测量多层透明膜系反射率

应用干涉法实现透明膜系反射率的测量。将待测膜系镀在两薄玻璃片，并构成F-P干涉仪，根据透射光谱的自由谱宽和干涉峰的半宽值，计算出膜系反射率，避免了光源波动对测量结果的影响。在实验所用膜系的反射率小于98％时，测量误差小于0．09％。     

光纤面板窗多碱光电阴极荧光谱特性研究

论述了光致荧光的特点以及微光像增强器多碱光电阴极光致荧光的测量原理, 测量了光纤面板输入窗多碱光电阴极的荧光谱. 测试结果表明, 光纤面板窗的多碱阴极的荧光谱不是一条光滑的高斯型曲线, 而是在一条高斯型曲线上叠加了一些小的干涉峰的曲线. 原因是光纤面板窗所传输的荧光中, 有两束特殊的光线. 一束光为准直光, 另一束光为入射角刚好等于全反射临界角的反射光. 这两束光具有固定的相位差或光程. 当这两束光的相位差相差λ的整数倍时, 它们将干涉并产生干涉加强峰;当这两束光的相位差相差1/2λ的奇数倍时, 它们将干涉并产生干涉减弱峰. 如果在荧光谱的峰值波长处刚好产生干涉加强峰, 那么所测量的峰值荧光强度较其固有的峰值荧光强度要高; 反之, 如果在荧光谱的峰值波长处刚好出现干涉减弱峰, 那么所测量的荧光强度就小于其固有的荧光强度. 另外由于受到干涉的影响, 荧光曲线半峰宽也不能精确确定,所以在分析光纤面板窗光电阴极的荧光谱时, 要考虑到干涉因素的影响.     

Study of the interference effects in an optical cavity for organic light-emitting diode applications

The interference effects generated in a bottom-emitting electroluminescent device fabricated on a polymer underlayer introduced with the aim of improving the anode roughness have been studied. The analysis of the interference fringes at different detection angles and the spatial coherence demonstrates that this phenomenon is due to multiple internal reflections that propagate in the polymer layer. This effect can be eliminated by modifying the polymer thickness and the incidence angle of the electromagnetic radiation at the anode-polymer interface. Inkjet etching technology is adopted for microcavities-shaped polymer structuring to destroy the resonator effect of the optical cavity.     

Dynamic gratings in KDP induced by piezoelectric vibrations at optical frequencies

Optical interference fringes were observed in the beam spot of the He-Ne laser transmitted through KDP. The interference fringes originate from the dynamic gratings induced by the electromagnetic field of the incident light. Diffraction fringes appear only in certain propagation directions of light through KDP. This observation is different from that monitored in α-quartz.     

Magneto-optical effects in crystals at the normal incidence

We consider the interaction of a polarized electromagnetic wave in a magnetically ordered crystal plate surrounded by an isotropic ambient at the normal incidence. The crystalline medium of the plate is specified by the general non-symmetric permittivity tensor. The results are expressed in terms of the transmission and reflection matrices which relate the electric fields of the incident wave to those of transmitted and reflected waves. Their applications are illustrated by examples of an isotropic plate magnetized normal to the interface, a cubic crystal magnetized parallel to the interface and an orthorhombic crystal magnetized along the axis normal to the interface. The effect of the reflection from the interfaces and the interference effect are included. The paper treats the reflection at an interface between an isotropic ambient and an absorbing magnetic crystal at small non-zero angles of incidence. The general reflection matrix is applied to the determination of the magneto-optical effects quadratic in magnetization.     

Stokes parameters and polarization contrasts in Young's interference experiment

We derive a spectral interference law that governs the behavior of the four Stokes parameters in Young's two-pinhole experiment with a random electromagnetic beam. In addition to the visibility of intensity fringes, we introduce three new contrast parameters that describe the interference-induced changes in the field's state of partial polarization. The polarization modulation depends on the electric field correlations at the pinholes and is closely related to the two-point Stokes parameters. The results are expected to be particularly useful in polarization interferometry and electromagnetic coherence theory. The formalism is demonstrated with specific examples.     

量子化电磁场在色散吸收有限介质中的传播

通过量子化吸收和色散介质中的电磁场,研究线极化波垂直入射至吸收和色散介质界面处的反射和折射行为,给出介质界面处光的正则量子理论.     

Modulated interference of reflected light from a liquid surface wave at tens Hertz frequencies

An analytic intensity expression of the reflected light from a liquid surface with acoustic wave at a few tens Hertz was derived. The expression displays a distinct modulated oscillation. Meanwhile high visibility and modulated interference fringes were obtained experimentally. Line scans across the reflection patterns indicate that the theory predication is well consistent with the experimental data. Moreover, a practical technique can be developed, based on this study, to determine the wavelength and amplitude of the SAW at these frequencies as well as the dynamic surface tension.     

Phase measurements of surface electromagnetic waves on silver with excitation through the substrate

Surface electromagnetic waves are excited in the visible and near-IR regions of the spectrum, and interference measurements are performed. Their excitation is effected by a helium-neon laser (3.39, 1.15, and 0.63 μm) on the interface between air and a silver film of thickness 100 μm deposited on a substrate in the form of a prism of fused quartz. The exciting radiation is supplied from the substrate side in a regime of total internal reflection in the prism on the edge of the silver film. The wave vector of the surface electromagnetic wave investigated is determined from the results of phase measurements. The dependence of the efficiency of the excitation of surface electromagnetic waves on the angle of incidence of the exciting radiation onto the substrate is investigated. The real part of the dielectric function of the silver film is calculated. Zh. Tekh. Fiz. 68, 64–68 (March 1998)     

液面微幅波动的激光干涉测量

对于低频微幅的液面波动,提出了一种激光干涉测量方法.实验上观察到了清晰、稳定的激光干涉图样.干涉图样受到调制,光强在两边界位置达到极大,形成两个极亮条纹.干涉条纹被限制在两个极亮条纹之间的确定区域内.根据光干涉理论推导出了调制干涉条纹光强度、相邻条纹角宽度、干涉区域角宽度与液面波物理参量之间的解析关系,该理论分析与实验...     

基于点光源的迈克耳孙干涉实验条纹的机理分析

一般国内的大学物理和大学物理实验教材都只介绍干涉圆条纹和直线干涉条纹,用迈克耳孙干涉仪可以调制出椭圆和双曲线干涉条纹;但对条纹形成的理论推导很少涉及．本文根据点光源双光束干涉理论,分析基于点光源照明的迈克耳孙干涉实验中所产生的各种可能的干涉条纹：双曲线形干涉条纹、圆形干涉纹、椭圆形干涉纹及直线形干涉纹的形成条件．本文也对等倾干涉条纹、等厚干涉条纹与既非等倾也非等厚干涉条纹的机理进行分析和比较．通过对每一种干涉图样的解析分析和比较,旨在对迈克耳孙干涉实验有更全面和更深刻的了解．     

Mean-square coherent light

Mean-square coherent light is defined as light that is able to interfere with fringes of unit visibility when its electromagnetic field is multiplied by appropriate nonsingular deterministic Jones matrices. It includes light that satisfies the factorization condition at order one and partially polarized light that leads to interference fringes of unit visibility. A necessary and sufficient experimentally measurable condition to determine if two electromagnetic fields are mean-square coherent is established. Furthermore, different properties of partially polarized mean-square coherent light are discussed, such as its relation to the factorization condition and its evolution with propagation.