Negative refraction without absorption via both coherent and incoherent fields in a four-level left-handed atomic system

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

doi:10.1016/j.optcom.2010.04.054

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…The relative permittivity and relative permeability of the E 3+ r -dopped optical fiber can be given according to the Clausius-Mossotti relations considering the local effect in dense medium [21,22] as follows:…”

Section: Model and Equationmentioning

confidence: 99%

The manipulated left-handedness in a rare-earth-ion-doped optical fiber by the incoherent pumping field

Zhao

Guo

Wei

2017

Optics Communications

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The left-handedness was demonstrated in an E 3+ r -dopped ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAFN) optical fiber modeled by a three-level quantum system. Under the electric and magnetic components of the probe field driving the transitions of 4 I 15/2 -4 I 13/2 and 4 I 9/2 − 4 I 13/2 in the E 3+ r -dopped optical fiber respectively, an increasing left-handedness was achieved by the incremental incoherent pumping field. However, the left-handedness damped when the incoherent pumping field drove the transition heavily. Our scheme may provide a solid candidate other than the coherent atomic vapour for left-handedness, and may extend the application of the rare-earth-ion-doped optical fiber in metamaterials via the external incoherent pumping field.

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Section: Model and Equationmentioning

confidence: 99%

The manipulated left-handedness in a rare-earth-ion-doped optical fiber by the incoherent pumping field

Zhao

Guo

Wei

2017

Optics Communications

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“…[64] Later, more schemes to realize negative refraction with low absorption were proposed based on EIT. [65][66][67][68] Motivated by the idea of the nonreciprocity induced by Doppler effect and negative refraction based on quantum coherence, we propose a nonreciprocal negative refraction scheme in hot atomic gas medium. Nonreciprocal negative refraction refers to that light behaves negative refraction when it incidences in one direction while behaves normal refraction property in the opposite direction.…”

Section: Introductionmentioning

confidence: 99%

Nonreciprocal negative refraction in a dense hot atomic medium

Zhang

Sun

2023

Chinese Phys. B

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We investigate the electromagnetic properties of a four-level dense atomic gas medium with Doppler effect. It is shown that the relative permittivity and relative permeability of the medium can show negative simultaneously with low absorption in the same detuning interval on account of electromagnetically induced transparency. Furthermore, with the suitable parameters, the nonreciprocal negative refraction can be obtained due to the Doppler effect, and the nonreciprocity frequency band can be regulated by adjusting the temperature, the intensity of the control field and the atomic density in this hot atomic medium.

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“…Quite recently, some new schemes for compensating losses in metamaterials have been suggested by Soukoulis et al who have developed both theoretical (computational) and experimental work on the loss compensation (or light amplification) in metamaterial structure units (e.g., split ring resonator and its array) with four-level layer underneath gain and InGaAs single-quantum-well gain [27][28][29][30]. In addition to the mechanisms of coupling to gain substrates [27][28][29][30], some scenarios for designing low-loss and almost zero-absorption media of negative refractive index have also been proposed by means of metamaterial analog of EIT [31] and incoherent manipulation of population in atoms [32]. Here, we shall suggest an alternative way to compensate the loss in a quantum-coherent left-handed atomic vapor (and hence to achieve a large optical gain in the negative refractive index) by introducing a pump field to realize the population inversion of a proper Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Gain-Assisted Negative Refractive Index in a Quantum Coherent Medium

Shen¹

2013

PIER

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Abstract-A new scheme for overcoming losses with incoherent optical gain in a quantum-coherent left-handed atomic vapor is suggested. In order to obtain low-loss, lossless or active left-handed media (LHM), a pump field, which aims at realizing population inversion of atomic levels, is introduced into a four-level atomic system. Both analytical and numerical results are given to illustrate that such an atomic vapor can exhibit intriguing electric and magnetic responses required for achieving simultaneously negative permittivity and permeability (and hence a gain-assisted quantum-coherent negative refractive index would emerge). The quantum-coherent left-handed atomic vapor presented here could have four fascinating characteristics: i) three-dimensionally isotropic negative refractive index, ii) doublenegative atomic medium at visible and infrared wavelengths, iii) high-gain optical amplification, and iv) tunable negative refractive index based on quantum coherent control. Such a three-dimensionally isotropic gain medium with negative refractive index at visible and infrared frequencies would have a potential application in design of new quantum optical and photonic devices, including superlenses for perfect imaging and subwavelength focusing.

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Negative refraction without absorption via both coherent and incoherent fields in a four-level left-handed atomic system

Cited by 24 publications

References 31 publications

The manipulated left-handedness in a rare-earth-ion-doped optical fiber by the incoherent pumping field

The manipulated left-handedness in a rare-earth-ion-doped optical fiber by the incoherent pumping field

Nonreciprocal negative refraction in a dense hot atomic medium

Gain-Assisted Negative Refractive Index in a Quantum Coherent Medium

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