圆偏振弦线驻波演示仪

针对传统弦线驻波演示仪配套仪器多、弦线细、驻波幅度小、观察困难的不足,设计了圆偏振弦线驻波演示仪,新装置利用圆偏振作为振源,用橡皮筋作为弦线来产生和形成弦线驻波,演示仪原理清晰,操作简便,形成驻波稳定,可视性好,可用于大学普通物理实验、中学物理驻波实验演示及研究。     

数字化光的偏振现象演示仪

数字化光的偏振现象演示仪赵仁宏，李田勋，陈百万（潍坊医学院物理教研室２６１０４２）在讲述光的偏振现象时，常借助于简单的演示，如用两块偏振片叠在一起，对准自然光观察光的偏振现象．这种演示方法虽有一定的效果，但操作不方便，显示不直观，效果差（尤其在学生数...     

偏振密码演示仪的设计与应用

针对应用型本科院校大学物理教学过程中，课堂演示实验使用多以现象观察为主，缺乏学生参与仪器制作机会的问题，设计了偏振密码演示仪，并利用偏振密码演示仪设计演示场景，将其用于大学物理教学和科普活动中。通过观察演示现象、分析演示原理、设计密码拼接方案、科普展演等过程，加深学生对偏振知识的理解，提高学生应用偏振知识设计仪器、提出自己的见解及传播偏振知识的综合能力。通过与穿墙而过演示仪进行对比得出偏振密码演示仪的使用受到了更多学生的喜爱，可见偏振密码演示仪符合应用型本科院校的教学需求。     

驻波演示仪的制作

本文分析介绍了横驻波演示仪和纵驻波演示仪的制作方法及其演示步骤。     

便携式双波长同步对比波动光学课堂演示的实现

本文设计自制了便携式波动光学演示仪.该演示仪采用红、绿双色半导体激光器作为光源,配备多种规格的干涉、衍射和偏振组件,可以演示杨氏双缝干涉、多缝干涉、单缝衍射、小孔衍射、一维和二维光栅衍射、偏振等波动光学的主要内容.仪器体积小巧,激光功率大,采用电池供电,这些优点使之便于携带,无需暗室而可在普通教室演示,双色平行光源可以同步对比不同波长的干涉、衍射效果,实现了波动光学理论内容与实验现象的同步课堂演示.     

可实现多振动合成的驻波演示装置

研制了一组简易的驻波演示仪,可实现多种振动的合成演示,具体包括不同振动方向的波的合成,不同传播方向的波的合成及环形驻波的演示.本文着重介绍了该演示装置的制作技术和演示效果.     

驻波演示仪的制作

针对驻波的运动特点和特殊的运动规律,进行了驻波演示仪的设计和制作,非常直观、形象地表现了驻波的运动规律。本文介绍了驻波演示装叠的原理、制作方法及演示效果。     

自制教具演示光的偏振方向

在传统教学演示实验中,使用起偏器和检偏器演示光的偏振现象只能获得2个偏振片的相对偏振方向.当偏振方向平行时,透射光的强度最大;偏振方向垂直时,透射光的强度最小.借鉴矢量偏振光的性质,自制了径向偏振片代替起偏器,根据透射光的强度分布可以直接观察到光的偏振方向.     

声驻波演示仪

以ICL8038和TDA7294为核心,设计声驻波演示仪的音频信号源与功率放大的驱动电路,用扬声器对驻波管内的雾滴产生区域性声压.在不同声压下,管内雾滴呈现不同程度的凝并现象,在重力作用下发生不同程度的沉降,从而直观地演示出驻波的波形特征.配以不同材质的活塞式反射界面,可演示声波在界面反射时的半波损失.     

水面波驻波演示仪

自制水面波驻波演示仪.在透明的长方体水槽一端安装搅水振子,通过控制电源电压调节振子的振动频率,可以演示频率为2~5Hz的水面波驻波.实验中水面波的频率与振子的振动频率相同,在水槽中形成稳定的驻波后,测量波节间的距离,计算后得到波长以及水面波的传播速度.     

Laser-induced diamagnetic anisotropy of coaxial nanowires

The diamagnetic susceptibility of the hydrogenic impurity in coaxial quantum well wires under high frequency laser field has been investigated taking into account the laser dressing effect on both the impurity Coulomb potential and confinement potential. The analysis revealed that a laser beam which is linearly polarized along the wire radial direction destroys the cylindrical symmetry of the donor Hamiltonian, leading to a strong dependence of the electron probability density on the laser field amplitude and orientation of the applied magnetic field. Thus, the direction of the magnetic field can be used as a tunable parameter in the variation of the diamagnetic susceptibility in low-dimensional structures under intense laser radiation. This phenomenon gives an additional degree of freedom in device applications.     

圆极化TE11输出模式旋向可在线切换的相对论磁控管模拟研究

提出了一种圆极化TE₁₁输出模式旋向可在线切换的相对论磁控管。该器件互作用区结构采用同腔型磁控管结构,输出结构采用全腔提取结构,励磁系统采用Helmholtz线圈磁场系统。本文利用全腔提取结构的模式激励理论对该器件的输出模式成分进行了理论分析,利用粒子模拟软件对该器件的工作性能进行了模拟研究。粒子模拟结果表明：在外加电压770 kV和外加轴向磁场0.2 T（方向与微波轴向输出方向同向）的条件下,该器件的工作模式为5π/6模,工作频率为2.35 GHz,输出功率为3.86 GW,功率效率达到55.5%,输出模式为右旋圆极化TE₁₁模式且模式纯度达到99%以上;当外加轴向磁场与微波轴向输出方向反向时,该器件的输出模式即可在线切换为左旋圆极化TE₁₁模式,而其他输出性能基本保持不变。     

利用琼斯矩阵分析全偏振光通过旋光器件的邦加球表示

用琼斯矩阵表示旋光器件．用琼斯矢量表示偏振光．计算椭圆偏振光通过旋光器件后的琼斯矢量，分析椭圆偏振光通过旋光器件的邦加球表示。结果表明．用此法得到的结论与已有结论一致。     

Application of Planar Poincaré Chart in polarization optics

A Planar Poincar Chart which describes the polarized state of light and its change as it through a polarized device is proposed in this paper. It provides a method for polarization analysis and polarization device design.     

A simple method for generating inhomogeneously polarized vector beam

Vector beam has attracted much attention recently due to novel properties and applications. And experimental generation of vector beam is very important and necessary when it is used in practice. In this paper, a simple and convenient method for generating inhomogeneously polarized vector beam is proposed. Conic polarization device is a core component that can convert incident beam into inhomogeneously polarized vector beam. And polarizing film is curved to construct this kind of conic polarization device. Experimental results show that this kind of method is valid and feasible, though attention should be paid to junction in the construction process of conic polarization device.     

Investigation of Near-Field Imaging Characteristics of Radial Polarization for Application to Optical Data Storage

Radially polarized incident light can generate a more confined longitudinal electric field on a focal plane in near-field (NF) optics than focusing circularly polarized light. Using this phenomenon, it is feasible to reduce beam spot size on storage media to increase the areal density of optical data storage. A radially polarized beam generates a beam spot which is 20% more confined on the 1st surface of medium than that of circularly polarized light. However, the peak intensity of total electric field sharply decreases and its transverse component is much more dominant inside the media stack. This confirms that radially polarized optics can be a candidate not for an NF recording system but for an NF read-only memory (ROM) system. Potentially, the results could be useful to understand the effect of radial and circular polarizations inside and outside medium for various applications of NF optics.     

Numerical analysis of a photonic crystal fiber based on two polarized modes for biosensing applications

This paper presents a theoretical study on a photonic crystal fiber plasmonic refractive index biosensor. The proposed photonic crystal fiber sensor introduces the concept of simultaneous detection with the linearly polarized and radially polarized modes because the sensing performance of the sensor based on both modes is relatively high, which will be useful for selecting the modes to make the detection accurately. The sharp single resonant peaks of the linearly polarized mode and radially polarized mode, are stronger and more sensitive to the variation of analyte refractive index than that of any other polarized mode in this kind of photonic crystal fiber. For linearly polarized mode and radially polarized mode, the maximum sensitivities of 10448.5nm per refractive index unit and 8230.7nm per refractive index unit can be obtained, as well as 949.8 and 791.4 for figure of merits in the sensing range of 1.33-1.45, respectively. Compared with the conventional Au-metalized surface plasmon resonance sensors, our device is better and can be applied as a biosensor.     

非阿贝尔腔量子电动力学模型下偏振光场的影响

通过使用场正交算符,而不是传统的玻色算符,研究了非阿贝尔腔量子电动力学(QED)模型中原子和偏振光场的相互作用。讨论了初始双模偏振光场对于原子布居数反转以及偏振光场的压缩特性的影响。结果表明,原子布居数反转的演化不仅与偏振椭圆的相位角有关,也与偏振椭圆的椭率角有关;只有当偏振椭圆是右旋圆偏振光时,原子布居数反转随时间的演化基本不变,趋近于初始值0,而当偏振椭圆是左旋圆偏振光时,原子布居数反转随时间的演化呈现周期性的崩塌复苏变化。另外,当初始光场是左旋圆偏振光时,光场可以出现周期性的压缩;而当初始光场是右旋圆偏振光时,光场的压缩不会持续出现。     

Backscattered polarization patterns, optical vortices, and the angular momentum of light

We demonstrate that the polarization patterns observed in backscattering of linearly polarized light are a manifestation of the conservation of angular momentum of light. We will show that this phenomenon can be described in terms of phase vortices that are acquired by the right and left circularly polarized components. The helicity and orbital angular momentum of these components satisfy the requirement for conservation of angular momentum.     

NLC-CLC-NLC cell as an electrically tunable polarization plane rotator

A liquid crystal optical device made of an optically anisotropic heterostructure is considered. The device consists of a cholesteric liquid crystal (CLC) layer sandwiched by two phase-shifting anisotropic layers of a nematic liquid crystal (NLC). In this structure each of the NLC layers is a quarterwave plate. The problem is solved both by Ambartsumian’s method of layer addition and Muller’s matrix method. The peculiarities of reflection spectra, eigen polarizations, rotation of polarization plane and polarization ellipticity are studied. It is shown that this device can work as a light modulator or a system for obtaining linearly polarized light with electrically tunable rotation of the polarization plane (which is especially important for optical communication), as well as a device for obtaining the linearly polarized light from a non-polarized one.