Chinese Optics Letters, Vol. 17, Issue 7, 072501 (2019)
Electronic manipulation of near-field nanofocusing in few-layer graphene-based hybrid nanotips
Yanhong Dong1, Qing Yang2, Guangqing Du1,*, Feng Chen1,**, Noor Uddin1, Dayantha Lankanath1, and Xun Hou1
- 1State Key Laboratory for Manufacturing System Engineering and Key Laboratory of Photonics Technology for Information of Shaanxi Province, School of Electronics & Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
- 2School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
In this Letter, we propose the electronic manipulation of localized surface plasmon resonance for active tuning in near-field nanofocusing. We theoretically studied the excited graphene tuning of the nanofocusing field in few-layer graphene (FLG)-based hybrid nanotips. It is revealed that the normalized enhanced electric field can be significantly promoted to more than 300 times. It is also observed that resonant peaks can be unprecedently modified by the electron state of excited graphene that is embedded in the substrate. It shows the possibility of flexible tuning of plasmon resonances via controlling the electron excitation state of graphene for specific advanced near-field nanofocusing applications.