摘要
Detection of local strain at the nanometer scale with high sensitivity remains challenging.Here we report near-field infrared nano-imaging of local strains in bilayer graphene by probing strain-induced shifts of phonon frequency.As a non-polar crystal,intrinsic bilayer graphene possesses little infrared response at its transverse optical phonon frequency.The reported optical detection of local strain is enabled by applying a vertical electrical field that breaks the symmetry of the two graphene layers and introduces finite electrical dipole moment to graphene phonon.The activated phonon further interacts with continuum electronic transitions,and generates a strong Fano resonance.The resulted Fano resonance features a very sharp near-field infrared scattering peak,which leads to an extraordinary sensitivity of-0.002%for the strain detection.Our results demonstrate the first nano-scale near-field Fano resonance,provide a new way to probe local strains with high sensitivity in non-polar crystals,and open exciting possibilities for studying strain-induced rich phenomena.
作者
Jing Du
Bosai Lyu
Wanfei Shan
Jiajun Chen
Xianliang Zho
u
Jingxu Xie
Aolin Deng
Cheng Hu
Qi Liang
Guibai Xie
Xiaojun Li
Weidong Luo
Zhiwen Shi
杜靖;吕博赛;单琬斐;陈佳俊;周先亮;谢京旭;邓奥林;胡成;梁齐;谢贵柏;李小军;罗卫东;史志文(Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),Shenyang National Laboratory for Materials Science,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;Institute of Physics,Xi’an Jiaotong University,Xi’an 710049,China;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology(Xi’an),Xi’an 710100,China;Institute of Natural Sciences,Shanghai Jiao Tong University,Shanghai 200240,China)
基金
Supported by the National Key Research and Development Program of China (Grant No.2016YFA0302001)
the National Natural Science Foundation of China (Grant Nos.11774224,12074244,11521404,and 61701394)
support from the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
additional support from a Shanghai talent program。
