Negative refraction with absorption suppressed by electromagneticly induced transparency in a left-handed atomic system

TL;DR

This paper demonstrates a method to achieve low-loss negative refraction in a dense four-level atomic system by using electromagneticly induced transparency to suppress absorption.

Contribution

It introduces a scheme for negative refraction with suppressed absorption without requiring equal transition frequencies, enhancing low-loss negative refractive materials.

Findings

Negative refraction with negative permittivity and permeability achieved

Electromagneticly induced transparency amplifies probe field response

Absorption can be suppressed in certain frequency ranges

Abstract

This paper intends to realize negative refraction with absorption suppressed by the electromagneticly induced transparency(EIT) in a dense four-level atomic system. Without the two equal transition frequencies responding to the probe field, the atomic system displays a negative refraction with the simultaneously negative permittivity and negative permeability(Left-handedness). The response of the probe field is amplified and propagates transparency in some frequency extents. Therefore, our aim for searching the low-loss negative refraction can be achieved in the scheme, given the main applied limitation of the negative refractive materials is the large amount of dissipation and absorption. However, an excessive signal field intensity would increase the absorption near the resonance in our scheme.