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Near-field imaging of a square-lattice metallic photonic-crystal slab at the second band
Feng Shuai,Feng Zhi-Fang,Ren Kun,Ren Cheng,Li Zhi-Yuan,Cheng Bing-Ying,Zhang Dao-Zhong,
冯帅
,冯志芳,任坤,任承,李志远,程丙英,张道中

中国物理 B , 2006,
Abstract: Imaging properties of a two-dimensional photonic crystal slab lens are investigated through the finite-difference time-domain method. In this paper, we consider the photonic crystal slab consisting of a square lattice of square metallic rods immersed in a dielectric background. Through the analysis of the equifrequency-surface contours and the field patterns of a point source placed in the vicinity of the photonic crystal slab, we find that a good-quality image can form at the frequencies in the second TM-polarized photonic band. Comparing the images formed at different frequencies, we can clearly see that an excellent-quality image is formed by the mechanisms of simultaneous action of the self-collimation effect and the negative-refraction effect.
Beam Collimation Using an Anisotropic Metamaterial Slab without Any Nanometer-sized Aperture  [PDF]
Shou Zhang,Guohui Li,Yanxia Cui,Feng Zhang,Sailing He,Yuying Hao,Furong Zhu
Physics , 2015,
Abstract: Plasmonic beam collimation effect has been thoroughly investigated based on the well-known nanometer-scale bull's eye structure formed by complex and high-cost fabrication processes. In this work, we report our effort for attaining beam collimation using an anisotropic metamaterial (AMM) slab that consists of a stack of alternating metal/dielectric layers and an integrated top metal grating. The results show that AMM slab allows creating the beam collimation effect similar to that of the bull's eye structure, an enabling technology for practical application due to its simple architecture and cost benefits. The excitation of surface plasmons at the AMM/air interface is derived. The structure of the AMM slab and its impact on beaming performance were analyzed using the effective medium theory and Finite Element Method.
Surface charge of a flat superconducting slab in the Meissner state  [PDF]
Jan Kolacek,Pavel Lipavsky,Ernst Helmut Brandt
Physics , 2001, DOI: 10.1016/S0921-4534(01)01220-5
Abstract: The electrostatic potential in the flat superconducting slab is evaluated in the framework of the Ginzburg-Landau theory extended by Bardeen to low temperatures. For magnetic fields below B_c1, we discuss the formation of a surface charge induced by the Bernoulli potential of the suppercurrents.
Imaging Properties of a Rectangular-Lattice Metallic Photonic-Crystal Slab
FENG Shuai,WANG Yi-Quan,LI Zhi-Yuan,CHENG Bing-Ying,ZHANG Dao-Zhong,
冯帅
,王义全,李志远,程丙英,张道中

中国物理快报 , 2007,
Abstract: We report the imaging properties of a two-dimensional rectangular-lattice photonic crystal (PC) slab consisting of rectangular metallic rods immersed in a dielectric background. By simulating the electromagnetic wave propagation through such a PC slab with the finite-difference time-domain method, we find that a point source placed in the vicinity of the PC slab can form a good-quality image through the slab. The frequency region where a good-quality image is formed can be controlled by choosing the direction along which the PC slab surface normal is placed.
Controlling the focusing properties of a triangular-lattice metallic photonic-crystal slab
Controlling the focusing properties of a triangular-lattice metallic photonic-crystal slab:

Feng Shuai,Wang Yi-Quan,Li Zhi-Yuan,Cheng Bing-Ying,Zhang Dao-Zhong,
冯 帅
,王义全,李志远,程丙英,张道中

中国物理 B , 2007,
Abstract: This paper studies the focusing properties of a two-dimensional photonic crystal (PC) slab consisting of a triangular lattice of metallic cylinders immersed in a dielectric background. Through the analysis of the equifrequency-surface contours and the field patterns of a point source placed in the vicinity of the PC slab, it finds that both the image distance and image quality can be controlled by simply adjusting the refractive index of the background material.
Closed–Form Solution to the Scattering of a Skew Strip Field by Metallic Pin in a Slab
Constantinos A. Valagiannopoulos
PIER , 2008, DOI: 10.2528/PIER07092206
Abstract: A tiny metallic cylinder placed into a planar dielectric waveguide scatters the field developed by a current-carrying skew strip centralized at the middle of the slab. Due to the small size of the scatterer, the induced surface current is taken independent of the azimuthal angle. The Green's function of the problem is expressed in closed form and it is inserted to the scattering integral after the polar equation of the strip has been determined. The behavior of nearfield quantities in the slab, with respect to geometrical and material parameters, is observed and examined.
Observation of flat band for terahertz spoof plasmon in metallic kagomé lattice  [PDF]
Yosuke Nakata,Takanori Okada,Toshihiro Nakanishi,Masao Kitano
Physics , 2012, DOI: 10.1103/PhysRevB.85.205128
Abstract: We study the dispersion relation of a metamaterial composed of metallic disks and bars arranged to have kagome symmetry and find that a plasmonic flat band is formed by the topological nature of the kagome lattice. To confirm the flat-band formation, we fabricate the metamaterial and make transmission measurements in the terahertz regime. Two bands formed by transmission minima that depend on the polarization of the incident terahertz beams are observed. One of the bands corresponds to the flat band, as confirmed by the fact that the resonant frequency is almost independent of the incident angle.
Electromagnetic Scattering of the Field of a Metamaterial Slab Antenna by an Arbitrarily Positioned Cluster of Metallic Cylinders
Constantinos A. Valagiannopoulos
PIER , 2011, DOI: 10.2528/PIER10123006
Abstract: The operation of a slab antenna with low-index metamaterial substrate is affected by a cluster of metallic cylinders positioned in the near-field area. A semi-analytical solution of the defined boundary value problem is obtained based on the small size of the rods. Several different configurations are found to possess beneficial features concerning the total radiated power and the angle of directive emission. The deduced diagrams are independently validated and discussed, revealing certain conclusions.
Dielectric Slab Photonic Crystals Containing Metallic Components for E Polarization Mode
Low Khee Lam,Mohd Zubir Mat Jafri,Sohail Aziz Khan
Applied Physics Research , 2010, DOI: 10.5539/apr.v2n2p17
Abstract: By using plane wave expansion method, we calculated the photonic band structure of metal cylinders in a dielectric medium. The photonic crystal is an identical, symmetrical structure with an infinite array of metallic rods. Arrangement of the metallic rods used is square lattice. The dielectric function of the metal from which the cylinders are formed has a simple, free electron form where ?p is the plasma frequency of the conducting electron. We manage to show the band structure of the square lattice. We found the relation between the band gap size and the filling fraction for some widely used material. For an example, FR-4, silicon, resin, teflon etc. The relation between the band gap size and the dielectric constant of the medium was studied.
Neogene tectonic block rotations and margin curvature at the Pampean flat slab segment (28o-33o SL, Argentina)
Japas,M.S; Ré,G.H;
Geoacta , 2012,
Abstract: available paleomagnetic data from the pampean flat slab segment reveal a heterogeneous rotation pattern that is interpreted herein as the result of the overprinting of late nnw-wnw left-lateral brittle-ductile megashear zones that would be also responsible for the continental margin bending.
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