Effect of thermal motion on the phenomenon of electromagnetically induced transparency

Zhang, Guiyin; Tao, Qiyong; Zheng, Zhizhen; Ren, Zhi

doi:10.1016/j.ijleo.2017.03.060

Cited by 9 publications

(1 citation statement)

References 17 publications

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“…The above studies on negative refraction in EIT materials have often ignored the Doppler effect and thus they can only be suitable for ultra-cooled atoms confined in a magneto-optical trap (MOT), for example. In order to be able to apply EIT materials in practice operating under different temperature conditions, some studies on EIT [31][32][33][34][35][36][37] as well as its applications such as group velocity [38][39][40][41], pulse propagation [42,43], Kerr nonlinearity [44][45][46][47] and so on, have been included the Doppler broadening. It showed that the influence of Doppler broadening is very significant on the EIT effect at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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

Ai¹,

Bang²,

Doai³

2022

Phys. Scr.

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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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