利用光学微腔提高石墨烯的光吸收效率  

Improvment of the Light Absorption Efficiency of the Graphene by the Optical Microcavity

作　　者：郑文浩[1] 龙拥兵[1] 王启汶 苏润梅 王锡苗 

机构地区：[1]五邑大学应用物理与材料学院,广东江门529020

出　　处：《微纳电子技术》2015年第4期216-220,共5页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(11004154);广东省自然科学基金资助项目(10152902001000024;S2013010012854);广东省高等学校人才引进专项资助项目-高层次人才项目(粤财教[2013]246;江财教[2014]10);广东高校优秀青年创新人才培养计划(LYM10130);广东省大学生创新创业训练项目(1134912018);广东省自然科学杰出青年基金资助项目(2014A030306005)

摘　　要：构建了结构为石墨烯/光学隔离层/银基底的光学微腔来提高石墨烯的光吸收效率。理论研究表明,通过合理设置光学微腔中光学隔离层的厚度,在正入射条件下,石墨烯的吸收光谱出现吸收峰而且最大光吸收效率可达8.5%,约为空气中单层石墨烯光吸收效率(约2.3%)的3.7倍。同时,研究结果还表明,可以通过改变光学隔离层的厚度来调控吸收峰的位置和半高宽。在斜入射条件下,石墨烯对横电波(光电场方向垂直于入射面)入射光的光吸收效率可达42%,约为空气中单层石墨烯光吸收效率的18.3倍。计算结果对石墨烯光电探测器的制备及应用具有一定的指导意义。The optical microcavity with the structure of graphene/optical spacer layer/silver substrate was constructed to improve the light absorption efficiency of the graphene.The theoretical research shows that by reasonably setting the thickness of the optical spacer layer for the optical microcavity,the absorption peak of the absorption spectrum for the grapheme appears under the condition of the normal incidence.The largest light absorption efficiency reaches 8.5%,which is about 3.7 times of the light absorption efficiency of the monolayer graphene（about 2.3%）in the air.It is also shows that the position and full width at half maxium of the absorption peak can be tuned by changing the thickness of the optical spacer layer.Under the condition of the oblique incidence on the graphene,the absorption efficiency of the transverse electric wave（the photoelectric field direction perpendicular to the incidence plane）incident light can reach 42%,which is about 18.3 times of the light absorption efficiency of the monolayer graphene in the air.The calculation results have a certain guiding significance for the preparation and application of the graphene photoelectric detector.

关 键 词：石墨烯 光吸收效率 光学微腔 传输矩阵法 斜入射 增强 

分 类 号：TN304.18[电子电信—物理电子学] O59[理学—应用物理]