Significantly enhanced infrared absorption of graphene photodetector under surface-plasmonic coupling and polariton interference
Significantly enhanced infrared absorption of graphene photodetector under surface-plasmonic coupling and polariton interference
复制标题
表面等离子体耦合和极化子干涉下石墨烯光电探测器的红外吸收显着增强
DOI：
10.1364/oe.26.030862
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发表时间：
2018
期刊：
影响因子：
3.8
通讯作者：
Chen Changhong
中科院分区：
文献类型：
--
作者：
Zhang Ye;Meng Dejia;Li Xiao;Yu Honghao;Lai Jianjun;Fan Zhaoyang;Chen Changhong
在这里，我们提出了一种基于石墨烯的长波红外探测器，为了增强红外吸收，其设计包括超颖表面的磁和电等离子体共振器来激发石墨烯表面等离子体激元（SPPs）。通过调谐石墨烯费米能量以实现匹配频率中的不同共振，确认了超过67.2%的峰值石墨烯吸收率，即使在使用有损耗电介质时也是如此，并且视场角高达90度。如果石墨烯具有不同的载流子迁移率，则吸收频率是可锁定的，并且该装置总是可以保持系统吸光度接近100%。显著增强的石墨烯吸光度，高达悬浮石墨烯吸光度的29倍（一般为2.3%），归因于磁共振和电共振之间的表面等离子体耦合以及相干SPP的法布里-珀罗干涉。本研究所建立的等离子体腔模模型和等效电路方法对其他光电器件的设计也有一定的指导意义。(C)根据OSA开放获取出版协议的条款，2018年美国光学学会
Here, we present a graphene-based long-wavelength infrared photodetector, for enhancing the infrared absorption of which the design consists of magnetic- and electric-plasmon resonators of metasurface to excite the graphene surface-plasmonic polaritons (SPPs). Through tuning the graphene Fermi energy to achieve the distinct resonances in a matching frequency, peak graphene absorbance exceeding 67.2% is confirmed, even when a lossy dielectric is used, and the field angle of view is up to 90 degrees. If the graphene is of a different carrier mobility, then the absorption frequency is lockable, and the device always can keep the system absorbance close to 100 percent. The significantly enhanced graphene absorbance, up to similar to 29-fold that of a suspended graphene (general 2.3%), is attributed to the surface-plasmonic coupling between the magnetic and the electric resonances, as well as Fabry-Perot interference of the coherent SPPs. The plasmonic cavity-mode model and equivalent-circuit method developed in this study will also be useful in guiding other optoelectronic device design. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement