失谐对微腔中石墨烯Faraday旋转的影响  

Influence of Detuning on Faraday Rotation of Graphene Embedded in a Microcavity

作　　者：陈忆[1] 王同标[1] 刘念华[1,2] 刘江涛[1,2] 

机构地区：[1]南昌大学物理系,南昌330031 [2]南昌大学高等研究院微尺度科学实验室,南昌330031

出　　处：《人工晶体学报》2015年第7期1799-1805,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11264029;11264030;11364033);江西省自然科学基金(20122BAB212003;20132BAB202003);江西省教育厅科研基金(GJJ13005)

摘　　要：利用转移矩阵方法研究了光子晶体微腔中石墨烯朗道能级间跃迁所导致的Faraday旋转。研究发现,微腔使得石墨烯的Faraday旋转增大8倍以上。特别地,微腔中石墨烯的Faraday旋转对失谐,也就是微腔的腔频和石墨烯中朗道能级间光子跃迁频率之差极为敏感。当存在一定的失谐时,微腔中石墨烯的吸收减小,微腔Q值增加,从而使得Faraday旋转角和透射率增大,且Faraday旋转谱线由对称结构变为不对称结构。The Faraday rotation attributed to the transition of Landau level of graphene embedded in a photonic crystal microcavity was investigated by transfer matrix method. The Faraday rotation of graphene can be enhanced over 8 times by the microcavity. In particular, the Faraday rotation of graphene embedded in a microcavity is very sensitive to detuning, namely the difference of the resonant frequency of the microcavity and the frequency of the transition of Landau levels of graphene. With an appropriate detuning, the absorption of graphene in a cavity can be suppressed, and the Q value of the cavity increases, thus the Faraday rotation and transmission are both enhanced. The Faraday rotation Spectrum also changes from a symmetric line shape to a strongly asymmetric one.

关 键 词：石墨烯 光子晶体微腔 Faraday旋转 

分 类 号：O469[理学—凝聚态物理]