Extraordinary Electromagnetic Scattering of Plane Wave by Double Negative Coated Sphere

2012 ◽  
Vol 571 ◽  
pp. 626-630
Author(s):  
Yan’e Shi ◽  
Zhen Sen Wu ◽  
Hong Fei Tian ◽  
Zheng Jun Li
Keyword(s):  
Plane Wave ◽  
Electromagnetic Scattering ◽  
Mie Theory ◽  
Degree Of Polarization ◽  
Core Shell ◽  
Double Negative ◽  
Scattered Intensity ◽  
Double Positive ◽  
Isotropic Sphere ◽  
Scattering Characteristic

Based on generalized Lorenz-Mie theory and Ricatti-Bessel Derivation functions, a theoretical analysis of electromagnetic scattering of a plane wave by an isotropic sphere coated by double negative metamaterial (DNM) is investigated. The extraordinary scattering characteristic of an isotropic sphere coated by DNM is numerically discussed, which is different from those by double positive material (DPM). The effects of the refractive index of inner sphere material and core-shell ratio on the scattered intensity and degree of polarization are numerically studied and analyzed.

scholarly journals Effect of Dissipative and Dispersive DNG Material Coating on the Scattering Behavior of Parallel Nihility Circular Cylinders

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Shakeel Ahmed ◽  
Muhammad Naveed ◽  
Abdul Ghaffar ◽  
Aqeel A. Syed ◽  
Q. A. Naqvi
Keyword(s):  
Plane Wave ◽  
Electromagnetic Scattering ◽  
Iterative Procedure ◽  
Coating Layer ◽  
Circular Cylinders ◽  
Double Negative ◽  
Double Positive ◽  
Different Types ◽  
Coating Layers ◽  
Expansion Coefficients

Electromagnetic scattering from coated nihility circular cylinders, illuminated byE-polarized plane wave, is investigated using an iterative procedure. Cylinders are infinite in length. The boundary conditions are applied on the surface of each cylinder in an iterative procedure in order to solve for the field expansion coefficients. The effect of different types of the coating layers including double positive (DPS) and double negative (DNG) on the alteration of the forward and backward scattering has been observed. Specially, the effect of dispersive and dissipative DNG coating layer has been focused. Numerical verifications are presented to prove the validity of this formulation by comparison with the published literature.

scholarly journals Core-Shell Nano-Antenna Configurations for Array Formation with More Stability Having Conventional and Non-Conventional Directivity and Propagation Behavior

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 99
Author(s):  
Qaisar Hayat ◽  
Junping Geng ◽  
Xianling Liang ◽  
Ronghong Jin ◽  
Sami Ur Rehman ◽  
...  
Keyword(s):  
Plane Wave ◽  
Propagation Direction ◽  
Core Shell ◽  
Incident Plane Wave ◽  
Polarization Direction ◽  
Shell Nanoparticles ◽  
Incident Plane ◽  
Core Shell Nanoparticles ◽  
Coated Nanoparticle ◽  
2D Array

The enhancement of optical characteristics at optical frequencies deviates with the choice of the arrangement of core-shell nanoparticles and their environment. Likewise, the arrangements of core-shell nanoparticles in the air over a substrate or in liquid solution makes them unstable in the atmosphere. This article suggests designing a configuration of an active spherical coated nanoparticle antenna and its extended array in the presence of a passive dielectric, which is proposed to be extendable to construct larger arrays. The issue of instability in the core-shell nanoantenna array models is solved here by inserting the passive dielectric. In addition to this, the inclusion of a dielectric in the array model reports a different directivity behaviour than the conventional array models. We found at first that the combination model of the active coated nanoparticle and passive sphere at the resonant frequency can excite a stronger field with a rotated polarization direction and a propagation direction different from the incident plane-wave. Furthermore, the extended 2D array also rotates the polarization direction and propagation direction for the vertical incident plane-wave. The radiation beam operates strong multipoles in the 2D array plane at resonant frequency (behaving non-conventionally). Nevertheless, it forms a clear main beam in the incident direction when it deviates from the resonance frequency (behaving conventionally). The proposed array model may have possible applications in nano-amplifiers, nano-sensors and other integrated optics.

scholarly journals Critical and Multiple Roles for the CD3ε Intracytoplasmic Tail in Double Negative to Double Positive Thymocyte Differentiation

2009 ◽  
Vol 182 (8) ◽  
pp. 4844-4853 ◽  
Author(s):  
Jean-Francois Brodeur ◽  
Samantha Li ◽  
Maria da Silva Martins ◽  
Louise Larose ◽  
Vibhuti P. Dave
Keyword(s):  
Multiple Roles ◽  
Double Negative ◽  
Double Positive ◽  
Double Positive Thymocyte ◽  
Thymocyte Differentiation

Pre-TCR signaling regulates IL-7 receptor α expression promoting thymocyte survival at the transition from the double-negative to double-positive stage

2003 ◽  
Vol 33 (7) ◽  
pp. 1968-1977 ◽  
Author(s):  
Cesar Trigueros ◽  
Katsuto Hozumi ◽  
Bruno Silva-Santos ◽  
Ludovica Bruno ◽  
Adrian C. Hayday ◽  
...  
Keyword(s):  
Double Negative ◽  
Tcr Signaling ◽  
Double Positive

scholarly journals Distinct contracted conformations of the Tcra/Tcrd locus during Tcra and Tcrd recombination

2010 ◽  
Vol 207 (9) ◽  
pp. 1835-1841 ◽  
Author(s):  
Han-Yu Shih ◽  
Michael S. Krangel
Keyword(s):  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Three Dimensional ◽  
Double Negative ◽  
Thymocyte Development ◽  
Double Positive ◽  
Long Distance ◽  
Large Pool ◽  
Antigen Receptor Loci

Studies have suggested that antigen receptor loci adopt contracted conformations to promote long-distance interactions between gene segments during V(D)J recombination. The Tcra/Tcrd locus is unique because it undergoes highly divergent Tcrd and Tcra recombination programs in CD4−CD8− double negative (DN) and CD4+CD8+ double positive (DP) thymocytes, respectively. Using three-dimensional fluorescence in situ hybridization, we asked whether these divergent recombination programs are supported by distinct conformational states of the Tcra/Tcrd locus. We found that the 3′ portion of the locus is contracted in DN and DP thymocytes but not in B cells. Remarkably, the 5′ portion of the locus is contracted in DN thymocytes but is decontracted in DP thymocytes. We propose that the fully contracted conformation in DN thymocytes allows Tcrd rearrangements involving Vδ gene segments distributed over 1 Mb, whereas the unique 3′-contracted, 5′-decontracted conformation in DP thymocytes biases initial Tcra rearrangements to the most 3′ of the available Vα gene segments. This would maintain a large pool of distal 5′ Vα gene segments for subsequent rounds of recombination. Thus, distinct contracted conformations of the Tcra/Tcrd locus may facilitate a transition from a Tcrd to a Tcra mode of recombination during thymocyte development.

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