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

作　　者：ZHAO ShunCai 

机构地区：[1]Physics Department,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第2期213-218,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.60768001 and 10464002)

摘　　要：This paper intends to realize negative refraction with absorption suppressed by the electromagnetically 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.This paper intends to realize negative refraction with absorption suppressed by the electromagnetically 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.

关 键 词：negative refraction absorption suppressed electromagnetically induced transparency （EIT） LEFT-HANDED 

分 类 号：O431[机械工程—光学工程] TB33[理学—光学]