Chin. Phys. Lett.  2021, Vol. 38 Issue (5): 056301    DOI: 10.1088/0256-307X/38/5/056301
Fano Resonance Enabled Infrared Nano-Imaging of Local Strain in Bilayer Graphene
Jing Du1,2†, Bosai Lyu1,2†, Wanfei Shan1,2†, Jiajun Chen1,2, Xianliang Zhou1,2, Jingxu Xie3, Aolin Deng1,2, Cheng Hu1,2, Qi Liang1,2, Guibai Xie4, Xiaojun Li4, Weidong Luo1,2,5*, and Zhiwen Shi1,2*
1Key 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
2Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
3Institute of Physics, Xi'an Jiaotong University, Xi'an 710049, China
4National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology (Xi'an), Xi'an 710100, China
5Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
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Jing Du, Bosai Lyu, Wanfei Shan et al  2021 Chin. Phys. Lett. 38 056301
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Abstract 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 $\sim $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.
Received: 11 March 2021      Published: 16 April 2021
PACS:  63.20.Kr  
  68.35.Gy (Mechanical properties; surface strains)  
  68.37.Uv (Near-field scanning microscopy and spectroscopy)  
Fund: Supported by the National Key Research and Development Program of China (Grant No. 2016YFA0302001) and the National Natural Science Foundation of China (Grant Nos. 11774224, 12074244, 11521404, and 61701394). Z.S. acknowledges support from the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and additional support from a Shanghai talent program.
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Jing Du
Bosai Lyu
Wanfei Shan
Jiajun Chen
Xianliang Zhou
Jingxu Xie
Aolin Deng
Cheng Hu
Qi Liang
Guibai Xie
Xiaojun Li
Weidong Luo
and Zhiwen Shi
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