论文可调谐石墨烯光电子器件是适合不知如何写电子器件方面的相关专业大学硕士和本科毕业论文以及关于电子器件论文开题报告范文和相关职称论文写作参考文献资料下载。
Abstract： Due to the excellent optical,mechanical and thermal properties,graphene is one of the most important topics in many research fields.Since the linear dispersion relationship near the Dirac point can be tuned conveniently by using the applied gate voltage,magnetic fields,and temperature,graphene layer is a good platform to investigate the tunable devices.We give a brief presentation of graphene tunable devices in the terahertz,nearInfrared and midInfrared spectral regions.It benefits to the investigation of the tunable optoelectronics devices in the future.
Key words： graphene； terahertz； tunable devices
1 Introduction
Graphene,a flat monolayer of carbon atoms packed into a dense twodimensional （2D） honeycomb crystal lattice,has unique thermal,mechanical,and electrical properties,such as the anomalous quantum Hall effect,Shubnikovde Haas oscillations and Klein paradox to coherent transport[1-2].It can also interact strongly with light in a broad frequency regime with the help of doping or regular structured patterns,e.g. the monolayer graphene can be observed under an optical microscope with the naked eyes[3].The conductivity of graphene can also be modified by means of chemical doping,electric field,or magnetic field.Graphene surface plaons （SPs） （GSPs） display forable properties of low losses,extreme confinement,and high tenability[4-5].Furthermore,besides the usual transverse magnetic plaons,when the imaginary part of graphene conductivity is negative,it support a transverse electric mode[6].Graphene TE modes reside very close to the light line and display great potential for future optoelectronic devices.With those excited electronic transport properties,graphene can serve as a good platform for further exploration of plaonic devices[7-8].
Recently,graphene he been widely adopted to fabricate tunable optoelectrical devices.For instance,through the coupling between spatially separated graphene sheets,splitter and ultracompact modulator he been demonstrated.Compared with the presented devices,the graphene modulators he several distinctive advantages[9-11]：（1） Strong lightgraphene interaction.A monolayer graphene possesses a much stronger interband optical transition than the quantum well systems；（2） Broadband operation.The graphene devices covers all telecommunications bandwidth and also the midand farinfrared；（3） Highspeed operation.Because the carrier mobility of the graphene layer is very high （ideally can reach 2×105 cm2·V-1·s-1）,the Fermi level can be rapidly modulated.Furthermore,due to the short photocarrier generation and relaxation time,the graphene modulators operate on the timescale of ps,and the modulation speed can reach more than 500 GHz,depending on the carrier density and graphene quality.
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参考文献：
1、 石墨烯产业尚待冷静发力 6年前，石墨烯的发现者安德烈·海姆和康斯坦丁·诺沃肖洛夫获得了2010年诺贝尔物理学奖。自此，有着“黑金”和超级材料之称的石墨烯以绚丽的姿态在全。
2、 石墨烯产业切勿重演大炼钢铁运动 中国现在处于“石墨烯淘金热”中，全国各地都在做石墨烯产业，石墨烯这个词几乎家喻户晓。作为如此火爆的“网红”，中国石墨烯产业发展之路到底该怎么走？。
3、 报告中国石墨烯产业仍处概念导入期 中国经济信息社近日发布的《2016-2017中国石墨烯发展年度报告》认为，目前我国石墨烯产业仍处在概念导入期，是产业化突破的初期阶段，石墨烯产业。
4、 中国科学家发明高导热超柔性石墨烯膜 浙江大学高分子系高超教授团队研发出一种高导热超柔性石墨烯组装膜，导热率接近理想单层石墨烯导热率的40%，可反复折叠6000次、弯曲10万次，有望。
5、 我国首条全自动量产石墨烯OPV生产线面世 近日，中国首条全自动量产石墨烯有机太阳能光电子器件生产线在山东菏泽启动，该项目主要生产可在弱光下发电的石墨烯有机太阳能电池（以下简称石墨烯OPV。
6、 石墨烯，新材料之王 未来10至20年内，会爆发一场技术革命，这个时代将来最大的颠覆，是石墨烯时代颠覆硅时代早在2014年，华为创始人兼总裁任正非在少有的接受媒体。