scholarly journals TE Magnetostatic Surface Waves in Symmetric Dielectric Negative Permittivity Material Waveguide

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
A. I. Ass'ad ◽  
H. S. Ashour
Keyword(s):  
Refractive Index ◽  
Surface Waves ◽  
Effective Refractive Index ◽  
Power Flow ◽  
Dielectric Film ◽  
Optical Nonlinearity ◽  
Negative Permittivity ◽  
Slab Waveguide ◽  
Left Handed ◽  
Magnetostatic Surface Wave

Nonlinear magnetostatic surface wave in a slab waveguide structure has been investigated. The design consisted of dielectric film between two thick nonlinear nonmagnetic negative permittivity material (NPM) layers. A dispersion relation for TE nonlinear Magnetostatic surface waves (NMSSWs) has been derived into the proposed structure and has been numerically investigated. Effective refractive index decreases with thickness and frequency increase have been found. Effective refractive index decrease with optical nonlinearity increase and switching to negative values of effective refractive index at a certain value of optical nonlinearity have been found. This meant that the structure behaved like a left-handed material over certain range. We found that the power flow was changing by changing the operating frequency, the dielectric film thickness, and the optical nonlinearity. Also, the effective refractive index and power flow attained constant values over certain values of dielectric constant values.

scholarly journals Near-Zero-Refractive-Index Structure at Optical Frequencies

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Hassan S. Ashour
Keyword(s):  
Refractive Index ◽  
Dispersion Relation ◽  
Power Flow ◽  
Dielectric Material ◽  
Index Structure ◽  
Slab Waveguide ◽  
Slab Thickness ◽  
Thickness Increase ◽  
Modal Dispersion ◽  
Left Handed

We have used a new class of left-handed materials, which uses 3D nanospheres distributed in loops in the dielectric host material. These 3D nanospheres loops give rise to negative effective permeability and permeability at Terahertz (optical) frequencies. The modal dispersion relation for Terahertz TE surface waves has been derived for a slab waveguide constructed from a dielectric material slab sandwiched between two thick layers of Terahertz left-handed material (LHM). The modal dispersion relation and the power flow were numerically solved for a given set of parameters: dielectric slab thickness, the operating frequency, mode order, and the power flow and extinction in the structure. The real part of the effective refractive index exhibits near-zero values, with small extinction coefficient values. Besides that, the power flow in the dielectric core increased with slab thickness increase and the power attenuation decreased with thickness increase.

MAGNETOSTATIC SURFACE WAVES IN FERRITE-NONLINEAR NONMAGNETIC NEGATIVE PERMITTIVITY MATERIAL STRUCTURE

2007 ◽  
Vol 21 (12) ◽  
pp. 1951-1960 ◽  
Author(s):  
A. I. ASS'AD ◽  
H. S. ASHOUR ◽  
M. M. SHABAT
Keyword(s):  
Refractive Index ◽  
Dispersion Relation ◽  
Surface Waves ◽  
Nonlinear Refractive Index ◽  
Power Flow ◽  
Forward Direction ◽  
Negative Permittivity ◽  
Material Structure ◽  
Layered System

Magnetostatic surface waves have been investigated in a layered system of a nonlinear nonmagnetic negative permittivity material (NPM) and Ferrite (YIG). We derived the dispersion relation before numerically solving the dispersion relation of the TE nonlinear magnetostatic surface waves (NMSSW) in the proposed structure and the power flow. We found out that the wave effective nonlinear refractive index is much smaller in the forward direction than in the backward direction and consequently, the power flow is lower for the forward direction than the backward direction.

NONLINEAR TE SURFACE WAVES IN A LEFT-HANDED MATERIAL AND SUPER LATTICES WAVE-GUIDE STRUCTURE

2007 ◽  
Vol 21 (06) ◽  
pp. 895-906 ◽  
Author(s):  
H. M. MOUSA ◽  
M. M. SHABAT
Keyword(s):  
Surface Waves ◽  
Magnetic Permeability ◽  
Power Flow ◽  
Wave Guide ◽  
Propagation Characteristics ◽  
Frequency Range ◽  
Left Handed ◽  
First Case ◽  
Planar Wave ◽  
The Waves

The paper is concerned with the propagation characteristics of TE surface waves in a planar wave-guide structure of a lateral antiferromagnetic-non magnetic super lattices (LANS) film bounded by a nonlinear dielectric cover and a left-handed substrate (LHM). In LHM substrate both permittivity and magnetic permeability are negative in definite frequency range. We study nonlinear dispersion properties of the TE surface waves and illustrate the power flow variation with the wave index in three different cases, i.e., when both permittivity and magnetic permeability are negative, when permittivity is negative and permeability is positive, and when both permittivity and magnetic permeability are positive. In the first case, we found that surface waves are backward traveling and the wave power variation with the wave index shows bistability behavior. We also found that by increasing the film thickness the waves turn from forward to backward traveling in the second case. In the third case, surface waves are always forward traveling.

Analysis of properties of metamaterial-based composite system

2019 ◽  
Vol 33 (15) ◽  
pp. 1950154 ◽  
Author(s):  
N. Abirami ◽  
K. S. Joseph Wilson
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Resonance Frequency ◽  
Applied Magnetic Field ◽  
Effective Refractive Index ◽  
Composite System ◽  
The Real ◽  
Left Handed

Magneto tunable left-handed material (LHM) which acts as a composite system has been theoretically demonstrated. The variation of the real and imaginary parts of the effective refractive index of the system is studied. The resonance that occurs in these studies are analyzed. The variation of impedance, reflectivity, absorptivity with frequency of the composite system was observed. The changes in resonance frequency with applied magnetic field are investigated. It is found that the resonance frequency increases with applied magnetic field.

RESERVOIR EFFECT ON A FOUR-LEVEL LEFT-HANDED SYSTEM

2014 ◽  
Vol 28 (04) ◽  
pp. 1450024
Author(s):  
N. BOUTABBA
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Thermal Bath ◽  
Potential Candidate ◽  
Left Handed ◽  
Atomic Medium ◽  
Coupling Strengths ◽  
Domain Of Parameters

In this paper, we theoretically analyze the electromagnetic properties of a negative refractive index medium configured as a four-level system under thermal bath effect. For different thermal bath coupling strengths, the system shows negative permittivity and permeability as well as a large negative refractive index. This atomic medium is stable against environmental effect in a large experimental reachable domain of parameters which makes it a potential candidate for important applications.

Radiative Properties of Multilayer Thin Films With Positive and Negative Refractive Indexes

2002 ◽  
Author(s):  
Ceji Fu ◽  
Zhuomin M. Zhang ◽  
David B. Tanner
Keyword(s):  
Refractive Index ◽  
Near Infrared ◽  
Negative Refraction ◽  
Normal Incidence ◽  
Field Vector ◽  
Radiative Properties ◽  
Negative Permittivity ◽  
Ring Resonators ◽  
Transmitted Beam ◽  
Left Handed

In 1968, Veselago [1] predicted that there could still be propagating waves in a medium that had simultaneously negative permittivity ε and permeability μ, because the product of ε and μ would be positive. However, to ensure energy conservation, he concluded that the refractive index must use the negative square root of the product of ε and μ (i.e., n = εμ). A consequence is certain unusual optical features in negative-index media. The electric field vector E, magnetic field vector H and wave vector k are a left-handed triplet, the basis for calling materials with simultaneously negative ε and μ “left-handed materials” (LHMs). LHMs would have novel optical properties. Light at non-normal incidence would bend to the side opposite that in a normal RHM; positive lenses would become negative; a flat slab could focus. The phase velocity of an electromagnetic wave would be opposite to the direction of energy flux, resulting in a reversed Doppler effect. Photons would have negative momentum and apply tension to the interface upon reflection. Recently, this kind of material has been demonstrated experimentally to exist. Shelby et al. [2] measured the scattering angle of the transmitted beam through a prism manufactured from a composite material consisting of a two-dimensional array of copper wires and split ring resonators and showed that the effective refractive index of the material is negative at microwave frequencies. Recent theoretical studies also showed that some photonic crystals might have negative-refraction properties in the near infrared spectral region [3].

CHARACTERISTIC OF SURFACE WAVES IN NONLINEAR LEFT HANDED — PHOTOSENSITIVE SEMICONDUCTOR WAVEGUIDE STRUCTURE

2007 ◽  
Vol 21 (32) ◽  
pp. 5319-5329 ◽  
Author(s):  
M. S. HAMADA ◽  
A. H. EL-ASTAL ◽  
M. M. SHABAT
Keyword(s):  
Light Intensity ◽  
Surface Waves ◽  
Power Flow ◽  
Forward Direction ◽  
Waveguide Structure ◽  
Semiconductor Layer ◽  
Propagation Characteristics ◽  
Left Handed ◽  
Nonlinear Surface Waves ◽  
Nonlinear Surface

The nonlinear electromagnetic surface waves in waveguide structure which contains photosensitive semiconductor layer and left-handed material (LHM) layer have been studied. The effects of light intensity and the LHM on the dispersion of electromagnetic surface waves have been investigated. It has been noticed that, as a result of the foundation of LHM layer in the structure, both forward and backward electromagnetic surface waves exist in the waveguide. It has also been shown that the photosensitive semiconductor layer controls the propagation characteristics of the electromagnetic surface waves. The power flow of the nonlinear surface waves has also been examined. It has been found that the majority of the electromagnetic surface waves propagate in the forward direction.

Characteristics of Left Handed Materials

2021 ◽  
Vol 19 (11) ◽  
pp. 01-14
Author(s):  
Thill A. Kadhum Al-Musawi ◽  
Samira Adnan Mahdi ◽  
Sundus Yaseen Hasan AL-Asadi
Keyword(s):  
Computer Simulation ◽  
Refractive Index ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Negative Permittivity ◽  
Split Ring ◽  
Left Handed ◽  
Artificial Materials ◽  
Permittivity And Permeability ◽  
Gap Width

Researchers have been interested in studying so-called Left-Handed Metamaterials LHM, which are artificial materials. These materials have unusual characteristics, like negative permittivity and permeability, and therefore negative index. This paper has been discussed some characteristics of LHM by designing a square split ring resonator SRR and simulating with CST microwave studio (Computer Simulation Technology) to get S-parameters. The broadband frequencies (0-30) GHz were taking to specify the effective range of frequencies to work with, which was found to be between (8- 14) GHz. Then, the parameters of SRR have been varied such as split width on, gap width, metal width, rod width and metal material. The measurements show some of parameters have been affected the values of resonance frequency and the others are not. Also, the negative values of permittivity, permeability, and refractive index have been approved.

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