【作者】 陈红艺；

【导师】 李师群； 杜春光；

【作者基本信息】 清华大学 ， 物理学， 2008， 博士

【摘要】 自2000年Smith首次实现介电常数和磁导率同时为负的左手材料以来,这一领域引起了人们的强烈关注。左手材料是一种新型的人造材料,人们已经发现它具有一些新的物理效用及奇特的性质。因此,研究左手材料的性质以及如何实现左手材料在理论和实践上具有重要意义。本论文的中心是SQUID左手材料的构建以及具有特定介电常数和磁导率形式的各向异性材料性质的研究,具体集中在以下几个方面。首先提出了基于SQUID和金属导线构建具有量子特性的左手材料的设想,并系统研究了在微波探测场和微波耦合场作用下这种左手材料的特性,重点考察了微波耦合场通过量子相干效应对这种左手材料的磁导率的调控。其次研究了SQUID阵列在另一种工作方式——直流偏置磁场作用下对小信号微波探测场的响应。我们发现磁导率及其共振频率均可以通过直流偏置磁场进行调节,并且在一定条件下出现双稳特性。这使实现极低频的负磁导率以及通过磁场脉冲实现磁导率在正负之间快速跳变成为可能。然后求解了具有一定色散关系的两半无穷左手材料界面上的表面等离子体激元模式,讨论了各向异性左手材料界面上的表面等离子体激元的新特性,并探讨各向异性左手材料对金属中表面等离子体激元的衰减的抑制的可能性。我们还提出了一种“衰逝波放大型”模式,并讨论了实验验证这种模式的可能性。最后研究了普通单轴晶体内表面的反射现象,提出了光线负反射的概念,讨论了实现负反射的条件。系统分析了电磁波在各向异性材料界面上的行为。得到了波法线的入射角和反射角之间、光线入射角和反射角之间的简单关系以及反射透射系数。我们通过分析发现,对于ε⊥、εz异号的左手材料,通过选择合适的主轴倾角,其反射折射行为的“怪异”会更明显。更多还原

【Abstract】 Since the left-handed materials (LHM) having both negative permeability and negative permittivity were first realized by Smith in 2000, this area has aroused strong concern. The LHM is a new kind of artificial materials, which has some new physical effects and peculiar properties. Therefore, studying how to construct LHM and about the properties of the LHM, is of great significance both in theory and application.The central aim of the thesis is the investigation of design the SQUID LHM and studying anisotropic materials with specific permittivity and permittivity. It focuses on the following areas:First, a new design of LHM based on SQUIDs and metal wires is proposed. And the quantum properties induced by a microwave probe field and a microwave coupling field in the LHM is systematicly studied, mainly focusing on controlling the permeability through the coupling field because of quantum coherence effects .Second, the response on the weak signal microwave probe field of the SQUID array working in another way– under DC bias magnetic field is studied. We find that the permeability and the resonance frequency can be adjusted by the DC bias magnetic field, and the bistable characteristic arises under certain conditions. This makes achieving negative permeability under extremely low frequency as well as the permeability switching between positive and negative value rapidly through a magnetic field pulse into possible.And then, we analyse the surface plasmon polaritons (SPPs) on the surface between two semi-infinite LHM having dispersion. Then we discuss the new features of the SPPs on the anisotropic LHM, and explore the possibility of inhibiting the decay. We also propose a“amplification of the decay wave”mode and discuss the possibility of the experimental examination for such a mode.Finally, the concept of the negative reflection (that is, the incident and reflected light lie on the same side of the normal) is proposed based on studying the negative reflection phenomenon on the inner surface of the uniaxial crystal. Conditions for achieving negative reflection in common uniaxial crystals is discussed too. After analysing the behavior of the electromagnetic waves in anisotropic materials, the simple relationship between the incident and the reflected angle of the wave vector and the incidence and the reflection angel of the ray is constructed. Also the reflection and transmission coefficients of the electromagnetic field at the interface is got. Our analysis found that for LHM having negativeε⊥and positiveεzor positiveε⊥and negativeεz , by choosing a suitable axis angle, its reflection and refraction behaves will be even more "strange".更多还原