Numerical study of anomalous dynamic scaling behaviour of (1+1)-dimensional Das Sarma-Tamborenea model

In order to discuss the finite-size effect and the anomalous dynamic scaling behaviour of Das Sarma-Tamborenea growth model,the (1+1)-dimensional Das Sarma-Tamborenea model is simulated on a large length scale by using the kinetic Monte-Carlo method.In the simulation,noise reduction technique is used in order to eliminate the crossover effect.Our results show that due to the existence of the finite-size effect,the effective global roughness exponent of the (1+1)-dimensional Das Sarma-Tamborenea model systematically decreases with system size L increasing when L > 256.This finding proves the conjecture by Aarao Reis[Aarao Reis F D A 2004 Phys.Rev.E 70 031607].In addition,our simulation results also show that the Das Sarma-Tamborenea model in 1+1 dimensions indeed exhibits intrinsic anomalous scaling behaviour.     

A generalized Collins formula derived by virtue of the displacement-squeezing related squeezed coherent state representation

Based on the displacement-squeezing related squeezed coherent state representation ≤ft\vert z\right\rangle _{g} and using the technique of integration within an ordered product of operators, this paper finds a generalized Fresnel operator, whose matrix element in the coordinate representation leads to a generalized Collins formula (Huygens--Fresnel integration transformation describing optical diffraction). The generalized Fresnel operator is derived by a quantum mechanical mapping from z to sz-rz^{\ast } in the % ≤ft\vert z\right\rangle _{g} representation, while ≤ft\vert z\right\rangle _{g} in phase space is graphically denoted by an ellipse.     

Two mutually conjugated tripartite entangled states and their fractional Fourier transformation kernel

We newly construct two mutually-conjugate tripartite entangled state representations,based on which we propose the formulation of three-mode entangled fractional Fourier transformation(EFFT) and derive the transformation kernel.The EFFT’s additivity property is proved and the eigenmode of EFFT is derived.As an application,we calculate the EFFT of the three-mode squeezed vacuum state.     

Vector-FEM Analysis of Millimeter Wave Circulator with SOC Truncation Technique

In this paper, the application of the edge-based vector finite element method combined with the short-open calibration (SOC) technique to waveguide junction circulators was presented. By applying permittivity and permeability tensors, the functional formula for tetrahedral vector elements are analytically derived in terms of the electric field strength. And the SOC technique is directly accommodated in the FEM algorithm and used to truncate the computational domain. The SOC technique removes or separates unwanted parasitics brought by the approximation of the impressed voltage source and also the problem of resulting inconsistency between different simulations. Truncation of computational domain by SOC technique makes the iterative solvers for large-sparse linear matrix equations from FEM converge much faster than by perfectly matching layers (PML). The analysis of three 2-port networks is sufficient to form the admittance matrix of the corresponding three-port waveguide junction circulators. To validate the theory, typical three-dimensional numerical results of isotropic dielectric-filled discontinuity are first presented and compared with other hybrid numerical techniques. Further, the ferrite filled waveguide junction circulators are analysed and compared with the measured and available publications. The comparison shows that good agreement is obtained.     

光致聚合物的高密度数字全息存储特性综述

文章综述了光致聚合物的高密度数字全息存储特性,可以看到光致聚合物将是高密度数字全息存储最有希望最先获得突破的材料。     

新概念晶体提拉方法及其可能的应用简介

介绍了一种利用金属材料的热膨胀而产生的位移代替传统的机械电机提拉晶体的新方法,可以预见这种新型提拉方法既可以消除晶体提拉过程中由于拉速的不平滑而引进的晶体生长条纹,同时也可以作为研究晶体生长机理的有力工具,另一方面,该方法可以用来提拉这样的一灰晶体,这种晶体溶质的浓度周期地分布于其中,且其周期远小于用机械电机所提拉的晶体溶质浓度的周期,同时,另一种新颖的控温方式被首次提出,即先把金属棒加热膨胀至一定的长度再冷却使之收缩,由于这种控温方式温度波动极端微小,使得金属棒收缩所产生的位移随时间的变化率达到微观的平滑极限。     

飞秒物理、飞秒化学和飞秒生物学

飞秒激光技术因其极高的时间分辨特性而被广泛应用于研究多种材料的超快过程,文章从几个侧面就飞秒技术在物理学,化学及生物学等方面的应用作了介绍,在飞秒物理方面,介绍了飞秒技术在研究半导体量子阱材料,纳米材料的性质及高次谐波产生等方面的研究进展,飞秒化学则主要介绍了飞秒技术在研究光化学反应,光解离过程、键的断裂及结合以及相关的动力学过程的应用;在生物方面,则介绍利用飞秒技术研究光合作用中的能量传递过程,视觉系统中的光致异构化过程以及DNA中的电荷传递及质子传递等过程的研究现状。     

表面热透镜技术探测光学薄膜的微弱吸收

对表面热透镜技术测量光学薄膜的微弱吸收进行了理论分析,并以此建立了薄膜微弱吸收测量实验装置,对几种典型薄膜的吸收进行了测试,证实了这种方法的可行性。     

1064 nm窄带干涉滤光片激光破坏研究

干涉滤光片由于内部谐振场共振吸收特性,其激光破坏过程有别于全反膜而具有特殊的性质。本文从谐振场及湿度场理论出发,计算得出了ZnS/MgF2为主材料的滤光片的谐振场及温度场分布规律。在此规律指导下,对相同膜系结构的一系列滤光片的激光破坏阈值、吸收及破坏形貌进行了测量与分析,结合实验结果对干涉滤光片独具特色的破坏发展过程作出了描述,并给出了一定的解释。     

Invariant Manifold Approach for the Stabilization of Nonholonomic Chained Systems: Application to a Mobile Robot

In this paper it is shown that a class ofn-dimensional nonholonomic chained systems can bestabilized using the invariant manifold approach. First, we derive aninvariant manifold for this class of systems and we show that, once onit, all the closed-loop trajectories tend to the origin under a linearsmooth time-invariant state feedback. Thereafter, it is shown that thismanifold can be made attractive by means of a discontinuoustime-invariant state feedback. Finally, a mobile robot is taken as anexample demonstrating the effectiveness of our study.