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Analytical Approach of the Nonlinear Surface Plasmon at a left-handed Material

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Journal of Applied Mathematics and Physics 2015年第6期3卷 673-679页

作者： Majdi S. Hamada Ali H. El-Astal Mahmoud A. Sbiah Mohammed M. Shabat Department of Physics Al-Aqsa University Gaza Gaza Strip Palestinian Authority Department of Physics The Islamic University of Gaza Gaza Strip Palestinian Authority

The surface wave dispersion relations of surface Plasmon at the interface of a left-handed material and a non-linear Kerr medium of arbitrary nonlinearity are derived based on a generalized first integral approach. The normalized power flow is also investigated for various values of frequency. The above study is conducted for both cases: self-focusing (α≺0) and de-focusing (α≻0) nonlinear Kerr coefficient.

关键词： left-handed Materials Nonlinearity Dispersion Relation Power Flow

The Confinement of Electromagnetic Radiation of Nanoemitters in a Multilayered Microsphere with left-handed Layers

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Journal of Electromagnetic Analysis and Applications 2010年第12期2卷 654-663页

作者： Gennadiy Burlak Alfredo Díaz-de-Anda 不详

The electromagnetic radiation of nanoemitters placed into a multilayered microsphere with dispersive left-handed (LH) layers included is studied numerically. It is found that in the frequency range where LH layers have a negative refraction index the field frequency spectrum consists of a series of narrow and well separated resonances. In the band of such peaks, the great part of the field energy is located in a LH layer and practically does not leave the microsphere.

关键词： left-handed Material Coated Microsphere Alternative Multilayered Stack Numerical Calculations

Stability of Nonlinear Te Surface Waves along the Boundary of left-handed Material

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Optics and Photonics Journal 2012年第2期2卷 123-128页

作者： Hana Mohammed Mousa Physics Department Al Azhar University Gaza Palestinian Authority

This paper is concerned with the stability characteristics of nonlinear surface waves propagating along a left-handed substrate (LHM) and a non-linear dielectric cover. These characteristics have been simulated numerically by using the perturbation method. The growth rate of perturbation is computed by solving the dispersion equation of perturbation. I found that the stability of nonlinear surface waves is affected by the frequency dependence of the electric permittivity εh and magnetic permeability μh of the LHM. The spatial evolution of the steady state field amplitude is determined by using computer simulation method. The calculations show that with increasing the effective refractive index nx at fixed saturation parameter μp, the field distribution is sharpened and concentrated in the nonlinear medium. The waves are stable of forward and backward behavior. At higher values of nx, attenuated backward waves are observed.

关键词： Nonlinear Waves Wave-Guides Dispersion Relation left-handed Material Growth Rate Stability

Helical Repeats of left-handed DNA

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Open Journal of Molecular and Integrative Physiology 2014年第2期4卷 20-26页

作者： Youcheng Xu UT Southwestern Medical Center at Dallas Dallas USA

DNA is generally assumed as a right-handed double helix and Z-DNA is a special kind of left-handed DNA infrequently found in nature. However, the finding of a zero linking number topoisomer supports a hypothesis that the two strands of DNA are winding ambidextrously, rather than plectonemically. It logically leads to a notion that the left-handed DNA is as common as right-handed DNA and the amount of left-handed DNA in a positively supercoiled plasmid prevails that of the right-handed DNA. In this report, the helical repeat of left-handed DNA, 12 bp per turn, was determined by a new method. How the positively supercoiled DNA was generated in hyperthermophiles and why their DNA can withstand the extreme high temperature are answered from an alternative theory.

关键词： left-handed DNA Ambidextrous Double Helix Linking Number Positive Supercoiling Hyperthermophiles

Guided Modes in a Four-Layer Slab Waveguide with Dispersive left-handed Material

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Journal of Electromagnetic Analysis and Applications 2010年第4期2卷 264-269页

作者： Lufa Shen Zihua Wang 不详

A four-layer slab waveguide including left-handed material is investigated numerically in this paper. Considering left-handed material dispersion, we find eight TE guided modes as frequency from 4 GHz to 6 GHz. The fundamental mode can exist, and its dispersion curves are insensitive to the waveguide thickness. Besides, the total power fluxes of TE guided modes are analyzed and corresponding new properties are found, such as: positive and negative total power fluxes coexist;at maximum value of frequency, we find zero total power flux, etc. Our results may be of benefit to the optical waveguide technology.

关键词： Slab Waveguide left-handed Material Dispersive Properties Total Power Fluxes

Effect of negative permittivity and permeability on the transmission of electromagnetic waves through a structure containing left-handed material

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Natural Science 2011年第4期3卷 328-333页

作者： Muin F. Ubeid Mohammed M. Shabat Mohammed O. Sid-Ahmed 不详

We investigate the characteristics of electromagnetic wave reflection and transmission by multilayered structures consisting of a pair of left-handed material (LHM) and dielectric slabs inserted between two semi-infinite dielectric media. The theoretical aspect is based on Maxwell's equations and matching the boundary conditions for the electric and magnetic fields of the incident waves at each layer interface. We calculate the reflected and transmitted powers of the multilayered structure taking into account the widths of the slabs and the frequency dependence of permittivity and permeability of the LHM. The obtained results satisfy the law of conservation of energy. We show that if the semi-infinite dielectric media have the same refractive index and the slabs have the same width, then the reflected (and transmitted) powers can be minimized (and maximized) and the powers-frequency curves show no ripple. On the other hand if the semi-infinite dielectric media have different values of refractive indices and the slabs have different widths, then under certain conditions the situation of minimum and maximum values of the mentioned powers will be reversed.

关键词： Electromagnetic Waves left-handed Materials Frequency Reflected and Transmitted Powers