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 2-D isotropic negative refractive index in a N-type four-level atomic system

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Shun-Cai Zhao ◽  
Qi-Xuan Wu ◽  
Kun Ma
Keyword(s):  
Refractive Index ◽  
Atomic System ◽  
Negative Refractive Index ◽  
Negative Permittivity ◽  
Two Dimensional ◽  
Orthogonal Signal ◽  
Wave Fields ◽  
Left Handedness ◽  
Permittivity And Permeability ◽  
Or Applications

Abstract2-D(Two-dimensional) isotropic negative refractive index (NRI) is explicitly realized via the orthogonal signal and coupling standing-wave fields coupling the Ntype four-level atomic system. Under some key parameters of the dense vapour media, the atomic system exhibits isotropic NRI with simultaneous negative permittivity and permeability (i.e. left-handedness) in the 2-D x-y plane. Compared with other 2-D NRI schemes, the coherent atomic vapour media in our scheme may be an ideal 2-D isotropic NRI candidate and has some potential advantages, significance or applications in the further investigation.

LINEAR AND NONLINEAR INTERSUBBAND REFRACTIVE INDEX CHANGES IN WURTZITEAlGaN/GaNDOUBLE QUANTUM WELLS: EFFECTS OF PIEZOELECTRICITY AND SPONTANEOUS POLARIZATION

2009 ◽  
Vol 16 (01) ◽  
pp. 11-17
Author(s):  
L. ZHANG
Keyword(s):  
Refractive Index ◽  
Density Matrix ◽  
Quantum Wells ◽  
Structural Parameters ◽  
Matrix Approach ◽  
Third Order ◽  
Numerical Result ◽  
Analytical Formulas ◽  
Index Changes ◽  
Linear And Nonlinear

Based on the density-matrix approach and iterative treatment, a detailed procedure for the calculation of the linear and nonlinear intersubband refractive index changes (RICs) in wurtzite GaN-based coupling quantum wells (CQWs) is given. The simple analytical formulas for electronic eigenstates and the linear and third-order nonlinear RICs in the systems are also deduced. Numerical result on a typical AlGaN / GaN CQW shows that the linear and nonlinear RICs sensitively depend on the structural parameters of the CQW system as well as the doped fraction of nitride semicondutor.

Negative Refractive Index in Atomic System Based on Incoherent Pump

2009 ◽  
Vol 29 (12) ◽  
pp. 3498-3502
Author(s):  
康海霞 Kang Haixia ◽  
寇军 Kou Jun ◽  
苏雪梅 Su Xuemei ◽  
高锦岳 Gao Jinyue
Keyword(s):  
Refractive Index ◽  
Atomic System ◽  
Negative Refractive Index ◽  
Incoherent Pump

CONTROL OF ABSORPTION AND KERR NONLINEARITY BASED ON QUANTUM COHERENCE WITHOUT DRIVING FIELD

2010 ◽  
Vol 24 (30) ◽  
pp. 2921-2930 ◽  
Author(s):  
ZHONGHUA HUANG ◽  
AIXI CHEN ◽  
ZHAOCHU CHEN ◽  
LI DENG
Keyword(s):  
Quantum Coherence ◽  
Atomic System ◽  
Electromagnetically Induced Transparency ◽  
Kerr Nonlinearity ◽  
Linear Absorption ◽  
Driving Field ◽  
Spontaneously Generated Coherence ◽  
Traditional Scheme ◽  
Atomic Medium ◽  
Induced Transparency

In a three-level atomic system, the influences of spontaneously generated coherence on the linear absorption and the Kerr nonlinearity are investigated. Our studies show that properties of linear absorption can be dramatically affected by the effect of spontaneously generated coherence. With increase of intensities of spontaneously generated coherence, absorption inhibition will occur, and finally the atomic medium becomes transparent. Furthermore, we find that the Kerr nonlinearity can be obviously enhanced under the action of effects of spontaneously generated coherence. Comparing with traditional scheme of the electromagnetically induced transparency, absorption and Kerr nonlinearity can be controlled without need another driving field in our scheme.

scholarly journals The Kerr Nonlinearity in an N-Type Four-Level System via Spontaneously Generated Coherence

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Yingjie Du ◽  
Kang Jin ◽  
Junxiang Zhang
Keyword(s):  
Atomic System ◽  
Kerr Nonlinearity ◽  
Level System ◽  
Probe Field ◽  
Spontaneously Generated Coherence

The Kerr nonlinearity is investigated in an N-type four-level atomic system whose both supper levels are degenerated or nearly degenerate. It is found that the spontaneously generated coherence as a result of the degenerate levels can change the Kerr nonlinearity dramatically depending on the angle between two spontaneous channels. In addition, we discover that the probe field makes its own contribution to the nonlinearity in comparison to indifference in general three-level systems.

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. .

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