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Fano Resonance Enabled Infrared Nano-Imaging of Local Strain in Bilayer Graphene 被引量:2
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作者 Jing Du Bosai Lyu +11 位作者 Wanfei Shan Jiajun Chen Xianliang Zho u Jingxu Xie Aolin Deng Cheng Hu Qi Liang Guibai Xie Xiaojun Li Weidong Luo Zhiwen Shi 《Chinese Physics Letters》 SCIE CAS CSCD 2021年第5期60-66,共7页
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 phono... 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. 展开更多
关键词 RED image Fano Resonance Enabled Infrared Nano-Imaging of Local Strain in Bilayer graphene
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Fano Resonance Effect in CO-Adsorbed Zigzag Graphene Nanoribbons
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作者 Gao Wang Meng-Qiu Long Dan Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第9期91-94,共4页
Quantum interference plays an important role in tuning the transport property of nano-devices. Using the non- equilibrium Green's Function method in combination with density functional theory, we investigate the infl... Quantum interference plays an important role in tuning the transport property of nano-devices. Using the non- equilibrium Green's Function method in combination with density functional theory, we investigate the influence to the transport property of a CO molecule adsorbed on one edge of a zigzag graphene nanoribbon device. Our results show that the CO molecule-adsorbed zigzag graphene nanoribbon devices can exhibit the Fano resonance phenomenon. Moreover, the distance between CO molecules and zigzag graphene nanoribbons is closely related to the energy sites of the Fano resonance. Our theoretical analyses indicate that the Fano resonance would be attributed to the interaction between CO molecules and the edge of the zigzag graphene nanoribbon device, which results in the localization of electrons and significantly changes the transmission spectrum. 展开更多
关键词 DOS Fano Resonance Effect in CO-Adsorbed Zigzag graphene Nanoribbons CO
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Optical fiber-based magnetically-tuned graphene mechanical resonator
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作者 曹鸿谦 刘增勇 +3 位作者 李丹然 鲁振达 陈烨 徐飞 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第1期44-48,共5页
In this study,an optical fiber-based magnetically-tuned graphene mechanical resonator(GMR)is demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane.The resonance frequency shif... In this study,an optical fiber-based magnetically-tuned graphene mechanical resonator(GMR)is demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane.The resonance frequency shift is achieved by tuning the tension of the graphene membrane with a magnetic field.A resonance frequency tunability of 23 kHz using a 100 mT magnetic field is achieved.The device provides a new way to tune a GMR with a non-contact force.It could also be used for weak magnetic field detection in the future with further improvements in sensitivity. 展开更多
关键词 optical fiber graphene mechanical resonator magnetically tuned resonator
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Multiple resonant excitations of surface plasmons in a graphene stratified slab by Otto configuration and their independent tuning 被引量:1
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作者 JIN YAO YING CHEN +3 位作者 LONGFANG YE NA LIU GUOXIONG CAI QING HUO LIU 《Photonics Research》 SCIE EI 2017年第4期377-384,共8页
Multiple resonant excitations of surface plasmons in a graphene stratified slab are realized by Otto configuration at terahertz frequencies. The proposed graphene stratified slab consists of alternating dielectric lay... Multiple resonant excitations of surface plasmons in a graphene stratified slab are realized by Otto configuration at terahertz frequencies. The proposed graphene stratified slab consists of alternating dielectric layers and graphene sheets, and is sandwiched between a prism and another semi-infinite medium. Optical response and field distribution are determined by the transfer matrix method with the surface current density boundary condition.Multiple resonant excitations appear on the angular reflection spectrum, and are analyzed theoretically via the phase-matching condition. Furthermore, the effects of the system parameters are investigated. Among them, the Fermi levels can tune the corresponding resonances independently. The proposed concept can be engineered for promising applications, including angular selective or multiplex filters, multiple channel sensors, and directional delivery of energy. 展开更多
关键词 mode Multiple resonant excitations of surface plasmons in a graphene stratified slab by Otto configuration and their independent tuning EFB EFA GSP
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