Double Fano resonances in hybrid disk/rod artificial plasmonic molecules based on dipole-quadrupole coupling

Chen，Zhiquan1; Zhang，Shi2; Chen，Yiqin2; Liu，Yanjun3; Li，Ping2; Wang，Zhaolong2; Zhu，Xupeng4; Bi，Kaixi5; Duan，Huigao6

2020-05-07

10.1039/d0nr00461h

Nanoscale   影响因子和分区

2040-3364

2040-3372

Fano resonance can be achieved by the destructive interference between a superradiant bright mode and a subradiant dark mode. A variety of artificial plasmonic oligomers have been fabricated to generate Fano resonance for its extensive applications. However, the Fano resonance in plasmonic oligomer systems comes from the interaction of all metal particles, which greatly limits the tunability of the Fano resonance. Besides, only a single Fano resonance is supported by many existing plasmonic oligomers, while multiple Fano resonances mostly occur in complex and multilayer structures, whose fabrication is greatly challenging. Here, a simple asymmetric plasmonic molecule consisting of a central metal disk and two side-coupled parallel metal rods is demonstrated. The simulation and experimental results clearly show that double Fano resonances appear in the transmission spectrum. In addition, the two Fano peaks can be independently tuned and single/double Fano peak switching can be achieved by changing one rod length or the gap distances between the rods and the disk. The modulation method is simple and effective, which greatly increases the tunability of the structure. The proposed asymmetric artificial plasmonic molecule can have applications in multi-channel optical switches, filters and biosensors. Moreover, the controllable plasmonic field intensity in the gap between the disk and rods also provides a new control means for plasmon-induced photocatalytic reactions and biosynthesis.

SCI ; EI

英语

其他

National Natural Science Foundation of China[11574078][51722503][51621004]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000534337900042

ROYAL SOC CHEMISTRY

20202308797148

Resonance ; Oligomers ; Biochemistry ; Optical switches

Optical Devices and Systems:741.3 ; Biochemistry:801.2 ; Organic Polymers:815.1.1 ; Mechanics:931.1 ; Atomic and Molecular Physics:931.3

2-s2.0-85084720697

Scopus

1.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People's Republic of China. duanhg@hnu.edu.cn and School of Mathematics and Statistics, Hunan University of Technology and Business, Changsha 410205, People's Republic of China
2.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,College of Mechanical and Vehicle Engineering,Hunan University,Changsha,410082,China
3.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.School of Physics Science and Technology,Lingnan Normal University,Zhanjiang,524048,China
5.Science and Technology on Electronic Test and Measurement Laboratory,School of Instrument and Electronics,North University of China,Taiyuan,030051,China
6.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,College of Mechanical and Vehicle Engineering,Hunan University,Changsha,410082,China

Chen，Zhiquan,Zhang，Shi,Chen，Yiqin,et al. Double Fano resonances in hybrid disk/rod artificial plasmonic molecules based on dipole-quadrupole coupling[J]. Nanoscale,2020,12(17):9776-9785.

Chen，Zhiquan.,Zhang，Shi.,Chen，Yiqin.,Liu，Yanjun.,Li，Ping.,...&Duan，Huigao.(2020).Double Fano resonances in hybrid disk/rod artificial plasmonic molecules based on dipole-quadrupole coupling.Nanoscale,12(17),9776-9785.

Chen，Zhiquan,et al."Double Fano resonances in hybrid disk/rod artificial plasmonic molecules based on dipole-quadrupole coupling".Nanoscale 12.17(2020):9776-9785.