+44-1518-081136Independently tunable dual-band coherent perfect absorption based on metal-graphene metasurface
13th Annual Conference on Materials Science, Metal and Manufacturing
November 16-17, 2017 Paris, France
Jiangnan Si, Xiaoxu Deng and Xianyi YU
Shanghai Jiao Tong University, China
Scientific Tracks Abstracts : Mater Sci Nanotechnol
Abstract:
A dual-band polarization-independent device based on metal-graphene nanostructures is proposed to realize coherent perfect absorption(CPA) at mid-infrared frequencies, which is composed of golden nanorings with two different sizes placed on graphene finger set. By controlling the relative phase of two incident countering-propagating beams, the coherent absorption at two resonant frequencies can be tuned from 0% to 98.3% and 0% to 98.4% separately. Besides, the coherent absorption can be tuned by the Fermi energy of corresponding graphene finger set, without changing the geometrical parameter of the nanostructures. The finitedifference time-domain (FDTD) solutions are employed to simulate the characteristics of the hybrid metal-graphene dual-band device. Distinguishing from the conventional graphene CPA devices, multiple CPA resonances in the hybrid metal-graphene CPA device are independently modulated by changing bias voltages applied on graphene finger set, which can be widely used in practical applications such as sensors, filters and switchers. Recent Publications ⢠Jianfa Zhang, Chucai Guo, Ken Liu, Zhihong Zhu, Weimin Ye, Xiaodong Yuan and Shiqiao Qin (2014) Coherent perfect absorption and transparency in a nanostructured graphene film. Opt. Express 22(10):12524-12532. ⢠Hu X, Wang J (2015) High-speed gate-tunable terahertz coherent perfect absorption using a split-ring graphene. Opt. Lett. 40(23):5538-5541.
Biography:
Jiangnan Si attended Shanghai Jiaotong University in China from 2011 to 2015 and received Bachelor’s degree in Physics. Since 2015 she is pursuing PhD in Optical Engineering at Shanghai Jiaotong University. Her main research interest concentrates on the area of hybrid metamaterials and graphene 2D materials nano structures in PIT (plasmonically induced transparency), EIT (electromagnetically induced transparency) and CPA (coherent perfect absorption), which mainly work in the mid-infrared region.
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