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

Zhao, Shun‐Cai; Liu, Zhengdong; Wu, Qi

doi:10.1088/0953-4075/43/4/045505

Cited by 20 publications

(17 citation statements)

References 35 publications

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“…Due to the most essential applications in quantum information science, the optical characteristics of multi-level atomic systems and diverse configurations have also been addressed in detail [29][30][31][32][33][34][35][36][37][38]. Quantum coherence and interference have been shown in certain articles to cause the refractive index of a material to increase or even become negative [39][40][41][42]. Many approaches for realizing the high and negative refractive index in multi-level quantum systems have been proposed based on quantum interference [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Phase control of optical Goos–Hänchen shifts in a quantum dot nanostructure via high refractive index

Raheli¹,

Abdulkareem²,

Al-Qargholi³

2022

Laser Phys.

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We proposed a model for adjusting Goos–Hänchen (GH) shifts in a cavity with quantum dot (QD) nanostructure in this letter. The actual component of the susceptibility was studied by analytical solution of the coherence term of the density matrix elements, and the refractive index of the QD nanostructure was explored. We discovered that the intracavity medium became phase sensitive because of the electron tunneling action. As a result, the relative phase of applied lights may be used to manipulate the medium’s refraction index. The GH shifts in reflected and transmitted light beams in high refractive index QD nanostructures with diminishing probe absorption were next examined. We discovered that the GH shifts of reflected and transmitted lights are greatly influenced by the applied lights’ relative phase. We established that greater negative or positive GH shifts in reflected and transmitted photons are conceivable in the presence of electron tunneling.

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Section: Introductionmentioning

confidence: 99%

Phase control of optical Goos–Hänchen shifts in a quantum dot nanostructure via high refractive index

Raheli¹,

Abdulkareem²,

Al-Qargholi³

2022

Laser Phys.

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“…To the best of our knowledge, monolayer graphene's GH shifts features of transmitted and reflected beams with negative refractive indices have not yet been documented. Through various mechanisms, the circumstances that lead to negative refraction index for different media have been thoroughly researched [29][30][31][32][33][34]. In [33], large negative refractive index of four-level atomic medium with zero absorption have been reported.…”

Section: Introductionmentioning

confidence: 99%

Controlling optical lateral shifts in a monolayer graphene system

Mohammed¹,

Fahim²,

Lafta³

et al. 2022

Laser Phys. Lett.

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In this letter, we have studied the optical lateral shifts of transmitted and reflected lights in a defect structure doped by a single layer of graphene nanostructure. For adapting the optical features of the lateral shifts, we have first studied the refractive index properties of the defect layer. We have studied the conditions for achieving the negative and positive refractive index of the graphene monolayer system. After that, we have discussed the optical lateral shifts of the reflected and transmitted light beams when the refractive index of the graphene nanostructure become positive or negative, respectively. We have found that the enhanced lateral shifts for reflected and transmitted lights may be possible for a positive refractive index. For the negative refractive index, we have realized that simultaneous negative or positive lateral shifts are possible for the reflected and transmitted light beams. In our proposed scheme, the lateral shifts at the fixed incident angle are possible only by tuning the optical parameters without needing to change the cavity structure.

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“…Zhang et al [9] proposed a scheme for realization of the negative refractive index in a V-type fourlevel atomic system. Zhao et al [10]- [12] produced a negative refractive index with vanishing absorption in the four-level system and showed negative refraction can be controlled by an incoherent pump field. Zhang et al [13] showed the negative permittivity and the negative permeability of the medium can be achieved simultaneously in a wider frequency band in a closed V-type four-level dense atomic vapor.…”

Section: Introductionmentioning

confidence: 99%

Negative Refractive Index in an Inhomogeneously Broadened Four-Level Inverted-Y Atomic Medium

Bang

Phu

et al. 2021

IEEE Photonics J.

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In this paper, we present the study on negative refractive index in an inhomogeneously broadened four-level inverted-Y atomic medium based on electromagnetically induced transparency (EIT). The expressions of the relative permittivity and the relative permeability are derived under Doppler broadening. For this four-level system, we have found two frequency bands of negative refractive index in an optical region corresponding to two EIT windows. The influences of coupling and signal laser fields as well as temperature on frequency bands of negative refractive index are investigated. Our research can be convenient for experimental implementation with real atomic media under different temperatures.

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

Cited by 20 publications

References 35 publications

Phase control of optical Goos–Hänchen shifts in a quantum dot nanostructure via high refractive index

Phase control of optical Goos–Hänchen shifts in a quantum dot nanostructure via high refractive index

Controlling optical lateral shifts in a monolayer graphene system

Negative Refractive Index in an Inhomogeneously Broadened Four-Level Inverted-Y Atomic Medium

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