Zero absorption and a large negative refractive index in a left-handed four-level atomic medium

2010 ◽  
Vol 43 (4) ◽  
pp. 045505 ◽  
Author(s):  
Shuncai Zhao ◽  
Zhengdong Liu ◽  
Qixuan Wu
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Left Handed ◽  
Atomic Medium

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 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

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. .

scholarly journals Some aspects of mass-energy equivalence which appears in left-handed metamaterials

2019 ◽  
Vol 6 ◽  
pp. 16 ◽  
Author(s):  
Naghi Gasimov ◽  
Muharrem Karaaslan ◽  
Cumali Sabah ◽  
Faruk Karadag
Keyword(s):  
Refractive Index ◽  
Composite Structures ◽  
Negative Refractive Index ◽  
Thought Experiment ◽  
Mass Energy ◽  
Negative Mass ◽  
Left Handed ◽  
Energy Equivalence ◽  
Phase And Group Velocities ◽  
Group Velocities

In this work, the concept of mass-energy equivalence in left-handed metamaterials is discussed by following Einstein's box thought experiment. Left-handed metamaterials are artificial composite structures that exhibit unusual properties, especially negative refractive index, in which phase and group velocities are directed oppositely. Equation E = mc2 assumes that, in vacuum, the propagation of an electromagnetic radiation from emitter to receiver is accompanied by the transfer of mass. It was hypothesized previously that if the space between emitter and receiver is medium with a negative refractive index, then radiation transfers the mass not from the emitter to receiver as expected, but rather from the receiver to the emitter due to the opposite directions of phase and group velocities. In this paper, it is shown that even though one radiating atom is taken, the negative mass transferring must be in force. In particular, it means that, if the atom radiates a photon in a medium with negative refractive index, photon transfers the mass not from the atom, but to the atom.

Negative Refractive Index in Left-Handed Materials

2000 ◽  
Vol 85 (14) ◽  
pp. 2933-2936 ◽  
Author(s):  
David R. Smith ◽  
Norman Kroll
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Left Handed

Negative refractive index in a Doppler broadened three-level Λ-type atomic medium

2021 ◽  
Author(s):  
Bang Huy Nguyen ◽  
Le Van Doai
Keyword(s):  
Refractive Index ◽  
Frequency Band ◽  
Negative Refractive Index ◽  
Doppler Width ◽  
Doppler Broadening ◽  
Coupling Laser ◽  
Left Handedness ◽  
Experimental Implementation ◽  
Atomic Medium ◽  
Increasing Temperature

Abstract We have achieved a negative refractive index with significantly reduced absorption in a three-level Λ-type atomic gas medium under Doppler broadening. It shows that the conditions for obtaining negative refractive index in the presence of Doppler broadening are very different from those of Doppler broadening absent. In particular, in order to obtain negative refractive index in the case of Doppler broadening the coupling laser intensity must be approximately ten times greater than that when the Doppler broadening is ignored. Meanwhile, the frequency band of negative refractive index with Doppler broadening is significantly expanded (about a hundred times) compared to that without Doppler broadening, however, the amplitude of negative refractive index decreases with increasing temperature (or Doppler width). Even in some cases as temperature (Doppler width) increases, the left-handedness of the material can disappear. In addition, we also show that the amplitude and the frequency band of negative refractive index can be changed by adjusting the intensity and the frequency of coupling laser. Our theoretical investigation can be useful for selection of laser parameters under different temperature conditions to achieve negative refractive index in experimental implementation.

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