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.

scholarly journals Parallel LC shaped metamaterial resonator for C and X band satellite applications with wider bandwidth

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Rashed Iqbal Faruque ◽  
Air Mohammad Siddiky ◽  
Eistiak Ahamed ◽  
Mohammad Tariqul Islam ◽  
Sabirin Abdullah
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Coupling Effect ◽  
Research Work ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Conducting Layer ◽  
Resonant Frequencies ◽  
New Era ◽  
Satellite Applications

AbstractThe electromagnetic properties of the metal based dielectric in the field of millimeter and sub-millimeter technology attracts a new era for innovation. In this research work, we have introduced a parallel LC shaped metamaterial resonator with wider bandwidth. The negative refractive index for two resonant frequencies is located from the negative permittivity from 5.1 to 6.3, 10.4 to 12.9 GHz, where the negative refractive index is located from 5.4 to 6.3 and 10.5 to 13.5 GHz. The electromagnetic wave polarizing in the proposed structure with parallel LC shaped metallic structure shows a fascinating response of wider bandwidth for the external electric and magnetic field. This paper focuses on the design of conducting layer for the suggested design with the parallel metallic arm for analysing the mutual coupling effect of the scattering response where the sub-branch in metallic design is shown more resonant frequencies with the enhancement of the compactness. This proposed structure is analysed with different metallic arrangements and array structures for different boundary conditions.

scholarly journals Negative Refractive Index In an Inhomogeneously Broadened Four-Level Inverted-Y Atomic Medium

2021 ◽  
pp. 1-1
Author(s):  
Bang Huy Nguyen ◽  
Nguyen Van Phu ◽  
Vu Ngoc Sau ◽  
Nguyen Thanh Cong ◽  
Doai Van Levan
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Atomic Medium

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.

Left-Handed Material in Five-Level System Based on the Effect of Spontaneously Generated Coherence

2013 ◽  
Vol 816-817 ◽  
pp. 242-245
Author(s):  
Xiang An Yan ◽  
Li Qiang Wang
Keyword(s):  
Refractive Index ◽  
Density Matrix ◽  
Quantum Coherence ◽  
Atomic System ◽  
Negative Refractive Index ◽  
Matrix Approach ◽  
Level System ◽  
Spontaneously Generated Coherence ◽  
Left Handedness ◽  
Left Handed

We propose a scheme for realizing negative refractive index in a multilevel atomic system. The theoretical modeling has been done using density matrix approach in which the spontaneously generated coherence (SGC) is also induced. It is shown that the negative refractive index can be obtained on the effect of quantum coherence. The parameters () quantifying left-handedness in the system become more negative if the SGC is defined in the appropriate value. Furthermore, left-handed material with reduced absorption is possible by choosing appropriate parameters.

scholarly journals A simplified analytical approach to calculation of the electromagnetic behavior of left-handed metamaterials with a graded refractive index profile

2007 ◽  
Vol 39 (2) ◽  
pp. 185-191 ◽  
Author(s):  
N. Dalarsson ◽  
M. Maksimovic ◽  
Z. Jaksic
Keyword(s):  
Refractive Index ◽  
Numerical Solutions ◽  
Negative Refractive Index ◽  
Refractive Index Profile ◽  
Electromagnetic Response ◽  
Reflection And Transmission ◽  
New Class ◽  
Left Handed ◽  
Analytical Expressions ◽  
Positive Index

We investigated the spectral properties of a new class of nanostructured artificial composite materials with tailored electromagnetic response, i.e. negative refractive index materials, also known as "left-handed" metamaterials. We analyzed structures incorporating both ordinary positive index media and negative refractive index metamaterials where the interface may be graded to an arbitrary degree. Utilizing a modified version of the Rosen-Morse function, we derived analytical expressions for the field intensity and spectral reflection and transmission through a graded interface between positive and negative index materials. We compared our results to numerical solutions obtained using the transfer matrix technique. .

The Left-Handed Properties of the Composite Medium Composed of Ferrite Cubes’ Array and Copper Net

2010 ◽  
Vol 434-435 ◽  
pp. 343-345 ◽  
Author(s):  
Li Hui Zhang ◽  
Yang Bai ◽  
Jin Xu Li ◽  
Li Jie Qiao
Keyword(s):  
Negative Refraction ◽  
Composite Medium ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Pass Band ◽  
Negative Permeability ◽  
Wave Amplification ◽  
Left Handed ◽  
Negative Role ◽  
Difference Time

Left-handed material (LHM), whose permittivity and permeability are both negative, has attracted much attention due to its exotic electromagnetic properties, such as negative refraction, backward wave propagation and evanescent wave amplification. The microwave left-handed property of a composite medium composed of ferrite cubes’ array and copper net was studied using the method of finite difference time domain in this paper. An obvious left-handed pass band emerged when ferrite cubes were combined with longitudinal copper wires, because the ferrite produced negative permeability by the ferromagnetic resonance and the copper wires produced negative permittivity by the plasma. With the addition of horizontal copper wires, the transmission intensity of the pass band was gradually weakened. It can be concluded that the horizontal wires played a negative role in realizing the composite LHM with ferrite cubes and copper net. This work gives an instructive direction to the fabrication of 3D LHMs.

Negative index from asymmetric metallic cut wire pairs metamaterials

2009 ◽  
Vol 1 (6) ◽  
pp. 521-527 ◽  
Author(s):  
Shah Nawaz Burokur ◽  
André de Lustrac
Keyword(s):  
Refractive Index ◽  
Material Properties ◽  
Negative Refractive Index ◽  
Negative Permittivity ◽  
Inversion Method ◽  
Experimental Measurements ◽  
Negative Index ◽  
Transmission And Reflection

Metamaterials made of exclusively metallic cut wire pairs have been experimentally demonstrated to exhibit a negative refractive index at optical frequencies. However, other related works on slightly different wire and plate pairs have not shown a negative index. In this paper, we present the analogy between previously reported S-shaped metamaterials and asymmetric cut wire pairs by a simple unifying approach. These two structures present a negative index for some geometrical configurations. Using simulations and experimental measurements in the microwave domain, we investigate the material properties of the last structure. Applying the inversion method from transmission and reflection responses, we show that a negative index is exhibited due to simultaneous negative permittivity ε and permeability μ. A negative index n is experimentally verified in a bulk prism engineered by stacking several layers of the metamaterial.

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