共查询到20条相似文献,搜索用时 31 毫秒
1.
利用传输矩阵法研究了含特异材料的一维超导光子晶体的带隙特性. 研究表明, 这类超导光子晶体同样具有由传统的电介质材料构成的超导光子晶体一样的低频带隙, 且在一定的参数下该低频带隙可以相当宽. 但在一定的结构参数下, 这类超导光子晶体同完全由传统的电介质构成的光子晶体一样不存在低频带隙. 还就超导光子晶体的偏振特性、光子晶体结构参数及环境温度的变化对光子带隙结构的影响进行了研究.
关键词:
超导光子晶体
传输矩阵法
特异材料
光子带隙 相似文献
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T. Feng L. Fan Y. H. Li C. L. Zhang Z. Feng 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,69(3):315-319
In this paper, the tunneling phenomenon occurring in the photonic
heterostructure consisting of single-negative (SNG) metamaterials is
experimentally studied. First, the SNG metamaterials are fabricated using
coplanar waveguide with lumped-element series capacitors and shunt inductors
loading. Then, the tunneling phenomenon occurring in the photonic
heterostructure containing SNG media is experimentally demonstrated.
Moreover, the insensitivity of the tunneling frequency to the
breakdown of periodicity of phonotic crystals was also illustrated. 相似文献
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The properties of photonic band gap in one-dimensional photonic crystals composed of single-negative metamaterials are studied theoretically. Our study shows that the photonic gap will vanish at a certain incident angle when both the phase-match and impedance-match conditions are satisfied simultaneously, suggesting that the bandwidth and location of the photonic gap are strongly dependent on the incident angle and polarization. However, the photonic gap will not vanish and may become insensitive to the incident angle when the two match conditions cannot be met. Our study also shows that losses in metamaterials have little effect on the properties of the photonic gap. 相似文献
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自从电磁波被发现和应用以来,利用各种材料或者结构调节电磁波的辐射行为、构造高性能的电磁辐射器件一直是研究人员的追求目标.经过百余年的发展,电磁辐射器件的方向性提高、带宽拓展等技术逐渐达到瓶颈.受自然材料电磁特性的限制,微带天线、喇叭天线等传统电磁辐射器件存在体积重量大、工作带宽窄、无法快速动态调控等缺陷,难以满足日益发展的通信技术的需求.近年来出现的亚波长结构可在深度亚波长尺度下调控电磁波的传输行为,出现了多种奇异的电磁现象,完善了传统的电磁学理论,在一定程度上突破了传统材料电磁特性的限制,形成全新的电磁辐射技术,有效解决了传统天线存在的口径大、厚度高、带宽窄等难题,促进了电磁学、光子学、材料学等领域的发展.这种基于超构材料的新型天线可以被称为超构天线,具有高方向性、低副瓣、超宽带、可重构等传统天线难以实现的功能.本文主要回顾了近年来基于亚波长超构材料的超构天线技术的发展现状和取得的成果,介绍了超构材料在亚波长尺度下对电磁波振幅、相位、偏振态等的衍射调控机理,以及在此基础上形成的新型辐射器件,例如相控阵天线、高方向性天线、低雷达散射截面天线,基于亚波长结构的多种偏振调控器件及其在天线中的应用等.在衍射极限尺度下,这种亚波长结构的调控行为可有效提升电磁辐射器件的方向性、带宽,并可重构天线的工作频率、偏振态等性能. 相似文献
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激光全息光刻技术在微纳光子结构制备中的应用进展 总被引:1,自引:0,他引:1
微纳光子结构研究随着光子学、半导体物理学及微加工技术的发展而逐渐蓬勃开展,并在其结构、理论、制备技术等方面取得了系列进展。受限于目前的微加工技术水平,要成功制备大尺度、高质量的光子材料仍然存在着一定挑战。激光全息光刻技术作为一种简便快捷的微结构制作技术已经发展成为一种经济快速制作大面积微纳超材料及光子晶体模板的重要手段。介绍了激光全息光刻技术的原理,详细阐述了该技术在制作三维面心立方、木堆积结构、金刚石结构光子晶体以及光学周期类准晶、手性超材料、周期性缺陷结构等微纳光子结构中的应用研究进展。激光全息光刻技术成功制作微纳光子结构为光子材料在更多领域的广泛应用提供了基础和方法。 相似文献
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《Comptes Rendus Physique》2008,9(1):4-15
Recent results obtained on semiconductor-based photonic crystal devices are of great promise for future developments of photonic crystals and their applications to ‘all-photonic’ integrated circuits. Device performance mostly relies on the strong confinement of light thanks to photonic bandgap effects, but photonic crystals also exhibit remarkable dispersion properties in their transmission bands, thus opening the perspective of new optical functionalities. Slow light, supercollimation, superprism, and negative refraction effects are among the fascinating phenomena which strongly motivate the community. Studies in these directions parallel those on metamaterials, which are expected to provide a simultaneous control of the dielectric permittivity and of the magnetic permeability. In this article, we briefly review some important advances on photonic crystals and metamaterials, as these two topics received a particular attention during the “Nanosciences et Radioélectricité” workshop organized by CNFRS in Paris on the 20th and 21st of March 2007. To cite this article: J.-M. Lourtioz, C. R. Physique 9 (2008). 相似文献
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We introduce a class of optical media based on adiabatically modulated, dielectric-only, and potentially extremely low-loss, photonic crystals (PC). The media we describe represent a generalization of the eikonal limit of transformation optics (TO). The basis of the concept is the possibility to fit some equal frequency surfaces of certain PCs with elliptic surfaces, allowing them to mimic the dispersion relation of light in anisotropic effective media. PC cloaks and other TO devices operating at visible wavelengths can be constructed from optically transparent substances such as glasses, whose attenuation coefficient can be as small as 10 dB/km, suggesting the TO design methodology can be applied to the development of optical devices not limited by the losses inherent to metal-based, passive metamaterials. 相似文献
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《Current Applied Physics》2018,18(4):447-451
Photonic memristor, which performs the function as memristor working on electromagnetic fields, can accelerate the development of all-optical network. A unipolar photonic memristive-like switching behavior in split-ring resonator based metamaterials was reported. Transmission-power (T-P) loops are observed in the metamaterials. And the T-P loops change with the detect frequency which indicates the tunability and designability of the photonic memristor. These behaviors are attributed to the increasing dielectric constant of MgTiO3 ceramic caused by the interaction of sample and electromagnet field. The mechanism supplies a general foundation for photonic memristors which can be used from radio frequency to optical wavelength. 相似文献
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Topological insulators are internally insulating but allow topologically protected surface waves at the boundary. In this work, the photonic analogue of topologically protected surface states in gyro-electromagnetic metamaterials are discovered. It is analytically and numerically demonstrated that the surface waves appear not only in the k-space common gap regions between the bulk states of the metamaterials and the vacuum state, but even can exist in an infinitely extended k-space. Such surface waves have extremely large wave vectors along the propagation direction with high field localization on the surface. It is believed that the high field localization of surface waves could improve the compactness of photonic devices and facilitate the integration of photonic circuits. 相似文献
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《中国科学:物理学 力学 天文学(英文版)》2015,(12)
In this review article, a brief introduction on the theory, experiments and applications of metamaterials is presented. The main focuses are concentrated on the composing meta-atoms, the method of transformation optics, the experimental demonstration of negative refraction, and the realizations of invisibility cloaks and electromagnetic black hole. At the end of this review, some typical applications of metamaterials, including high-performance antennas made of zero-refractive-index materials, inhomogeneous metamaterial lenses, and planar metasurfaces, are introduced in details. 相似文献
14.
We study the radiation emitted by an oscillating dipole moving with a constant velocity in a photonic crystal, and analyze the effects that arise in the presence of a photonic band gap. It is demonstrated through numerical simulations that the radiation strength may be enhanced or inhibited according to the photonic band structure, and anomalous effects in the sign and magnitude of the Doppler shifts are possible, both outside and inside the gap. We suggest that this effect could be used to identify the physical origin of the backward waves in recent metamaterials. 相似文献
15.
Complete photonic band gaps (PBGs) are found in one-dimensional ternary photonic crystals (1D TPCs) composed of an ordinary dielectric and single negative metamaterials. The proposed TPC gives omni directional PBG completely independent of polarizations dependent weekly on angle of incidence. Here the choice of different parameters of TPC is done in such a way so that it eliminates the Brewster's-angle transmission resonance, thus allowing a complete 3D PBG. It exhibits a photonic band or gap near frequencies where either the magnetic permeability or the electric permittivity of the metamaterial changes sign, whose width increases with the increasing angle of incidence. These result from the dispersive properties of the metamaterials and disappear for the particular case of propagation along the stratification direction. The results are discussed in terms of incident angle, layer thickness, dielectric constant of the dielectric material for TE and TM polarizations. 相似文献
16.
We investigate extraordinary features of optical parametric amplification of Stokes electromagnetic waves that originate from the three-wave mixing of a backward phonon wave with negative group velocity and two ordinary electromagnetic waves. Such properties were earlier shown to exist only in plasmonic negative-index metamaterials that are very challenging to fabricate. Nonlinear optical photonic devices with properties similar to those predicted for negative-index metamaterials are proposed. 相似文献
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S. Roshan Entezar A. MadaniA. Namdar H. Tajalli 《Journal of magnetism and magnetic materials》2012,324(9):1739-1744
The effect of anisotropy on the photonic band structure and surface polaritons of a one-dimensional photonic crystal made of uniaxially anisotropic epsilon-negative (ε<0,μ>0) and mu-negative (ε>0,μ<0) metamaterials is theoretically investigated. Two different cases of uniaxially anisotropic epsilon-negative and mu-negative metamaterials are considered. It is found out that for one case of anisotropy, one-dimensional photonic crystal does not have any single-negative band gap. As a result, it can not support the surface polaritons. While, for another case, the structure shows single-negative band gaps. So, the surface polaritons can be excited at the interface of such a photonic crystal. However, these surface polaritons, unlike the isotropic case, are not omnidirectional and they are restricted to a limited rang of the propagation constant. 相似文献
20.
Z. Jacob J.-Y. Kim G. V. Naik A. Boltasseva E. E. Narimanov V. M. Shalaev 《Applied physics. B, Lasers and optics》2010,100(1):215-218
The photonic density of states (PDOS), like its electronic counterpart, is one of the key physical quantities governing a
variety of phenomena and hence PDOS manipulation is the route to new photonic devices. The PDOS is conventionally altered
by exploiting the resonance within a device such as a microcavity or a bandgap structure like a photonic crystal. Here we
show that nanostructured metamaterials with hyperbolic dispersion can dramatically enhance the photonic density of states
paving the way for metamaterial-based PDOS engineering. 相似文献