共查询到20条相似文献,搜索用时 101 毫秒
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硅酸铋晶体内电光、磁光相互作用的耦合波分析及其传感应用 总被引:1,自引:0,他引:1
通过建立并求解硅酸铋(BSO)晶体内电光、磁光相互作用的耦合波方程,得到了BSO晶体的偏振传递函数,由此分析了BSO晶体内偏振光的周期性变化规律,并给出直接描述外加电场、磁场对偏振光作用的琼斯矩阵和米勒矩阵.最后设计了一种基于BSO晶体的电压、电流同时传感系统. 相似文献
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在很多精密原子光谱实验中,杂散磁场或者磁场强度的不均匀所引入的系统误差,是影响实验不确定度的主要因素之一.为保证测量精度,必须实现精密的磁场控制.氦原子精细结构的精密光谱测量可用于测定精细结构常数,同时也是检验多电子原子体系量子电动力学理论的一种重要方法.本文介绍所设计制作的磁屏蔽系统和余弦线圈产生精密可控磁场,并利用He原子光谱对所加磁场进行了精密测定.磁屏蔽结构可将外磁场降低到小于0.8 mGs(1 Gs=10-4T),控制磁场在20 Gs范围内时,光谱测量区域磁场的不均匀性和控制误差均小于10 mGs.在此实验条件下,氦原子精细结构精密光谱测量中磁场所导致的系统误差小于0.2 kHz. 相似文献
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利用矩阵方法分析了液晶的旋光效应,导出了液晶旋光的矩阵表示. 利用JG-3型连续可调谐磁场仪搭建实验装置,红外1350 nm激光器做光源,测量了偏振光通过磁场作用下BL-009型向列相液晶的旋光角,详细分析了磁场对液晶旋光性能的影响. 通过实验测试,对液晶的阈值磁场强度进行了讨论,同时对实验结果进行了理论上的分析,得出了液晶旋光角随磁场与液晶盒表面夹角而变化的结论,验证了液晶分子轴的旋转方向与磁场的方向无关,这为更好的研究液晶的特性以及液晶器件的设计具有重要的参考价值.
关键词:
液晶
矩阵
磁致旋光 相似文献
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提出一种基于琼斯光瞳的光刻投影物镜偏振像差检测方法。推导了基于琼斯矩阵的检测方程,建立了光强矢量与琼斯矩阵克氏积的线性关系,利用该线性关系直接检测琼斯光瞳形式的偏振像差。以一个典型的光刻投影物镜的琼斯光瞳为检测对象对所提方法进行仿真验证,仿真中考虑了偏振元件与CCD的实际参数误差,并与传统穆勒矩阵椭偏法转换得到的琼斯光瞳进行比较。对于同一种典型的偏振元件旋转角组合,与传统测量方法相比,所提方法测量的偏振衰减和偏振相位延迟误差均明显降低。仿真结果表明,所提方法在不增加现有测量装置复杂度的基础上,明显提高了琼斯光瞳形式偏振像差的测量精度。 相似文献
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Adoum Kriga Désiré Allassem Malloum Soultan Jean-Pierre Chatelon Ali Siblini Bruno Allard Jean Jacques Rousseau 《Journal of magnetism and magnetic materials》2012
The paper details the characterization of thin magnetic materials layers, particularly soft materials, with respect to their behaviour in frequency (from 10 MHz to 1 GHz). The proposed method is suitable for any soft but insulating magnetic material; Yttrium Iron Garnet (YIG) is used as an example. The principle is based on a comparison between simulations for different values of the permeability and measurement values versus frequency of planar inductor structures; an experimental validation is proposed as well. Thin magnetic material is first deposited on an alumina substrate using RF sputtering technique; a planar spiral winding of copper is then deposited on the magnetic material by the same technique. The effective permeability versus frequency is obtained by comparing two samples of spiral windings with and without magnetic material. Network analyser measurements on samples of various geometrical dimensions and of different thicknesses are necessary to determine the effective magnetic permeability; we have obtained a relative effective permeability of about 30 for seven turns spiral inductor of a 17 μm YIG film. 相似文献
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The commonly adopted projective measurements are invalid in the specified task of quantum state discrimination when the discriminated states are superposition of planar-position basis states whose complex-number probability amplitudes have the same magnitude but different phases. Therefore we propose a corresponding scheme via weak-value measurement and examine the feasibility of this scheme. Furthermore, the role of the weak-value measurement in quantum state discrimination is analyzed and compared with one in quantum state tomography in this Letter. 相似文献
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《Current Applied Physics》2020,20(1):167-171
This paper describes the effect of 5-nm thick platinum (Pt), aluminum (Al) and silicon oxide (SiOx) capping layers on the static and dynamic magnetic properties of 400-nm thick polycrystalline YIG films deposited on a Pt buffer layer. Both static and dynamic magnetic properties of Pt capped YIG film are totally different among all YIG films. Namely, the squareness of the magnetization curve for Pt capped YIG film increases, indicating that Pt capped YIG film is magnetically softer than other YIG films. Interestingly, the effective Gilbert damping parameter of Pt capped YIG films is about four times as large as those of other YIG films, and its value is approximately 9.52 × 10−4. However, the value of Gilbert damping is 2.55 × 10−4, 3.46 × 10−4 and 3.85 × 10−4 respectively for no capping, SiOx capping and Al capping samples respectively. This huge change in Gilbert damping parameter is mainly originating from the spin pumping effect, which arises at the interface of a material having strong spin orbit interaction such as Pt. Moreover, the enourmous increase in the value of effective anisotropic field and decrese in effective saturation magnetization indicates interface anisotropy is induced in Pt capped sample. These results suggest that the static and dynamic magnetic properties of YIG film can be controlled by selecting an appropriate capping layer. 相似文献
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Instantaneous frequency measurement using two parallel I/Q modulators based on optical power monitoring 下载免费PDF全文
A scheme for instantaneous frequency measurement(IFM)using two parallel I/Q modulators based on optical power monitoring is proposed.The amplitude comparison function(ACF)can be constructed to establish the relationship between the frequency of radio frequency(RF)signal and the power ratio of two optical signals output by two I/Q modulators.The frequency of RF signal can be derived by measuring the optical power of the optical signals output by two I/Q modulators.The measurement range and measurement error can be adjusted by controlling the delay amount of the electrical delay line.The feasibility of the scheme is verified,and the corresponding measurement range and measurement error of the system under different delay amounts of the electrical delay line are given.Compared with previous IFM schemes,the structure of this scheme is simple.Polarization devices,a photodetector and an electrical power meter are not used,which reduces the impact of the environmental disturbance on the system and the cost of the system.In simulation,the measurement range can reach 0 GHz-24.5 GHz by adjusting the delay amount of the electrical delay lineτ=20 ps.The measurement error of the scheme is better at low frequency,and the measurement error of low frequency 0 GHz-9.6 GHz can reach-0.1 GHz to+0.05 GHz. 相似文献
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Shuyao Chen 《中国物理 B》2022,31(4):48503-048503
Yttrium iron garnet (YIG) films possessing both perpendicular magnetic anisotropy (PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices. However, it is still challenging to achieve PMA in YIG films thicker than 20 nm, which is a major bottleneck for their development. In this work, we demonstrate that this problem can be solved by using substrates with moderate lattice mismatch with YIG so as to suppress the excessive strain-induced stress release as increasing the YIG thickness. After carefully optimizing the growth and annealing conditions, we have achieved out-of-plane spontaneous magnetization in YIG films grown on sGGG substrates, even when they are as thick as 50 nm. Furthermore, ferromagnetic resonance and spin pumping induced inverse spin Hall effect measurements further verify the good spin transparency at the surface of our YIG films. 相似文献
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Yusuf Turek 《理论物理通讯》2020,72(5):55504-97
In this study, we give a new proposal to measure the temperature of the spin in a sample in a magnetic resonance force microscopy system by using postselected weak measurement, and investigating the Fisher information to estimate the precision of the scheme. We show that in a high temperature regime the temperature of the spin can be measured via a weak measurement technique with proper postselection and our scheme is able to increase the precision of temperature estimation. 相似文献
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B. Andlauer J. Schneider W. Wettling 《Applied Physics A: Materials Science & Processing》1976,10(3):189-201
A survey of characteristic optical and magneto-optical properties of the representative ferrite materials yttrium iron garnet
(YIG) and iron borate is presented. The interaction of light with collective magnetic excitations, leading to pronounced magnetooptical
phenomena, is discussed. Typical examples for the strong influence of foreign atoms on optical and magneto-optical properties
of YIG are also given. 相似文献
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The effect of target rotation rate on the magneto-optical properties and induced magnetic anisotropy of pulse laser deposition grown Bi:YIG garnets has been investigated. The rotation rate dependence of magnetic properties of thin films has been studied using magneto-optical Faraday rotation combined with magneto-optical Kerr measurement setup. Our results show that decreasing the target rotation rate can also increase the polar coercive field and hence magnetic anisotropy. Also the spectral answer of samples show the capability of use of them in one off optical ranges such as visible, near infrared and far infrared regions. 相似文献
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X射线干涉仪以非常稳定的单晶硅晶格作为长度单位 ,可以实现亚纳米精度的微位移测量。提出了将 X射线干涉仪和扫描隧道显微镜结合起来 ,利用单晶硅的晶格尺度测量扫描探针显微镜样板节距的技术方案 ,并进行了实验研究 相似文献