Abstract
In the present study, we design a tunable plasmonic refractive index sensor with nanoring-strip graphene arrays. The calculations prove that the nanoring-strip have two transmission dips. By changing the strip length L of the present structure, we find that the nanoring-strip graphene arrays have a wide range of resonances (resonance wavelength increases from 17.73 μm to 28.15 μm). When changing the sensing medium refractive index nmed, the sensitivity of mode A and B can reach 2.97 μm/RIU and 5.20 μm/RIU. By changing the doping level ng, we notice that the transmission characteristics can be tuned flexibly. Finally, the proposed sensor also shows good angle tolerance for both transverse magnetic (TM) and transverse electric (TE) polarizations. The proposed nanoring-strip graphene arrays along with the numerical results could open a new avenue to realize various tunable plasmon devices and have a great application prospect in biosensing, detection, and imaging.
Highlights
Surface plasmon resonance (SPR) on the metal/dielectric interface at the sub-wavelength scale provides an excellent platform for a variety of optoelectronic applications [1,2]
By changing the strip length L of the present structure, we find that the nanoring-strip graphene arrays have a wide range of resonances
We find that the electric field of the nanoring-strip is mainly distributed on the nanoring arm edge of the structure and has stronger field enhancement
Summary
Chunlian Cen 1,2 , Hang Lin 1,3 , Jing Huang 1,3 , Cuiping Liang 1,3 , Xifang Chen 1,3 , Yongjian Tang 1,3 , Zao Yi 1,3, *, Xin Ye 2, *, Jiangwei Liu 4 , Yougen Yi 5, * and Shuyuan Xiao 6. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621010, China. College of Physics and Electronics, Central South University, Changsha 410083, China. Received: 25 October 2018; Accepted: 12 December 2018; Published: 18 December 2018
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
