共查询到20条相似文献,搜索用时 78 毫秒
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静止时线性、均匀、各向同性的介质,当它运动时变得不再各向同性,其标志是光线和波法线分离,波面形状由球面变成椭球面.本文给出了非各向同性介质与介质运动速度间的定量关系,导出了电磁波在运动介质表面反射和折射的普遍规律.并且就介质的运动方向与介质表面垂直或平行两种特殊情形进行了较为详细的分析。 相似文献
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负折射率介质层中光波的相位和传输特性研究 总被引:13,自引:0,他引:13
针对在理解负折射率材料中光波的传播特性时相位的特殊性质 ,详细分析推证了负折射率介质中折射率、波矢k的大小和方向、空间坐标系以及波相相位互之间的关系。分析结果表明负折射率介质层中的波矢k的反常取向是由于其标量值为负 ;在统一的坐标系下 ,由该标量值参与数值计算和分析 ,k则由标量值和单位矢量k0 (k0 >0 )共同决定 ,而不必再考虑左、右手系的区别。在此基础上依据电磁场理论推导了光波在负折射率介质层中的传输矩阵 ,用以分析含有负折射率介质层的复杂薄膜系统的光学性质。初步计算结果显示含有负折射率介质层的膜系对TE和TM波的光谱特性都有显著改变 相似文献
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针对光子在真空和进入透明介质后的能量和动量问题进行探讨,探讨光子在透明介质中的微观运动与宏观观测中所定义的光子能量动量关系之间的联系,澄清对光子的能量动量关系和对质能关系认识上所存在的误区。 相似文献
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导出费涅耳以太牵引系数三种主要方法的基础是:(1)假想的以太的物理性质(费涅耳的方法),(2)作用于光子的相对论速度变换关系;(3)运动介质电动力学的麦克斯韦-闵可夫斯基方程[1]. 本篇短文的目的在于提出一个以光子图象为基础的方法.我以为它既引人入胜、又富有启发性.主要概念是,将光线的牵引解释为光子在介质内运动过程中吸收与再发射之间产生的有限时间延迟. 为了简化模型,用一个光子的适当的假想行为代替一组光子的平均行为.让光子进入长度为l的静止水平玻璃棒的左端,并以速度c(在原子之间)移向右端.设在光程中它沿运动方向“暂停”了若… 相似文献
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根据Goos-Hanchen (G-H)位移的定义[1,2],入射角为θ的TE光束通过空气中厚度为a、折射率为n的光密介质板时,透射光束的G-H位移为Δy=(2kya)/(kx) (k2x(k2x+k′2x)/k40)/(4k2xk′2x/k40+sin2k′xa)-(ky)/(kxk′x) (sin2k′xa)/(4k2xk′2x/k40+sin2k′xa)(1)其中kx、k′x分别为光束在空气和介质板中的波矢量在垂直于介质板方向上的分量,ky为光束的波矢量在平行于介质板方向上的分量,k20=k′2x-k2x。式(1)给出的光束的G-H位移不同于折射定律给的结果atanθ′,这里θ′由折射定律决定nsinθ′=sinθ。由式(1)可见,透射光束的G-H位移为负的充分条件是k2x(k2x+k′2x)/k40sin2k′xa/2k′xa,这就要求k′xa比较小,即介质板的厚度比较小。G-H位移为负说明在这种情况下,光密介质板的等效折射率为负,这个现象有点类似于Shelby等人最近发现的负折射率现象[3]。当介质板的厚度很大时,式(1)的第二项与第一项相比可以忽略不计,此时G-H位移大于零。可见G-H位移为负是介质板的两个边界共同作用并相互影响的结果。但这时的G-H位移与折射定律给出的结果还是不同的。值得指出的是,对于具有一定发散角的光束而言,式(1)的第一项的第二个因子和第二项的本身是入射角的函数,从而是k′xa的周期函数,当玻璃板的厚度较大时,对这些周期函数在一个周期内平均可得<Δy>atanθ′,这正是由折射定律求得的结果。 相似文献
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讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系,指出引力场强g并不是与r的平方成反比,这是由于银河系的大小和形状不能忽略造成的.强调了万有引力定律的适用条件. 相似文献
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The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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SJ Rose 《Contemporary Physics》2013,54(2):109-121
In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required. 相似文献
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We study the Cauchy problem for the Whitham modulation equations for increasing smooth initial data. The Whitham equations are a collection of one-dimensional quasi-linear hyperbolic systems. This collection of systems is enumerated by the genus g=0,1,2, ... of the corresponding hyperelliptic Riemann surface. Each of these systems can be integrated by the so-called hodograph transformation introduced by Tsarev. A key step in the integration process is the solution of the Tsarev linear overdetermined system. For each g>0, we construct the unique solution of the Tsarev system, which matches the genus g+1 and g–1 solutions on the transition boundaries. 相似文献
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Let G be one of the local gauge groups C(X, U(n)),C
(X, U(n)), C(X, SU(n)) or C
(X, SU(n)) where X is a compact Riemannian manifold. We observe that G has a nontrivial group topology, coarser than its natural topology, w.r.t. which it is amenable, viz. the relative weak topology of C(X, M(n)). This topology seems more useful than other known amenable topologies for G. We construct a simple fermionic model containing an action of G, continuous w.r.t. this amenable topology. 相似文献
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The lightest supersymmetric particle (LSP) is a natural candidate for the cold dark matter of the universe. In this Letter we discuss how to test the mechanism responsible for the LSP stability at the LHC. We note that if R-parity is conserved dynamically one should expect a Higgs boson which decays mainly into two right-handed neutrinos (a “leptonic” Higgs) or into two sfermions. The first case could exhibit spectacular lepton number violating signals with four secondary vertices due to the long-lived nature of right-handed neutrinos. These signals, together with the standard channels for the discovery of SUSY, could help to establish the underlying theory at the TeV scale. 相似文献
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Denis de Carvalho Braga 《Physics letters. A》2010,374(42):4316-4320
In this note we present an analytical study of the stability of the equilibria of the Rikitake system. We prove that the two non-hyperbolic equilibria of the Rikitake system are unstable for all positive values of the parameters. 相似文献
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