Liquid-crystal-based tunable plasmonic waveguide filters

Yin, Shengtao1,2; Liu, Yan Jun1; Xiao, Dong1; He, Huilin1; Luo, Dan1; Jiang, Shouzhen3; Dai, Haitao4; Ji, Wei2; Sun, Xiao Wei1

2018-06-13

10.1088/1361-6463/aac0aa

JOURNAL OF PHYSICS D-APPLIED PHYSICS   影响因子和分区

0022-3727

1361-6463

We propose a liquid-crystal-based tunable plasmonic waveguide filter and numerically investigate its filtering properties. The filter consists of a metal-insulator-metal waveguide with a nanocavity resonator. By filling the nanocavity with birefringent liquid crystals (LCs), we could then vary the effective refractive index of the nanocavity by controlling the alignment of the LC molecules, hence making the filter tunable. The tunable filtering properties are further analyzed in details via the temporal coupled mode theory (CMT) and the finite-difference time-domain (FDTD) method. The simulation results show that the resonant wavelengths have lineai redshift as the refractive index of the nanocavity increases and the coupling efficiency is more than 65% without considering the internal loss in the nanocavity and waveguides. These achieved results by the FDTD simulations can be also accurately analyzed by CMT. The compact design of our proposed plasmonic filters is especially favorable for integration, and such filters could find many important potential applications in high-density plasmonic integration circuits.

liquid crystal plasmonics wavelength filtering device waveguide

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China (NSFC)[61571273]

Physics

Physics, Applied

WOS:000433065900001

IOP PUBLISHING LTD

20182305288022

Bandpass filters ; Circular waveguides ; Crystal filters ; Filtration ; Finite difference time domain method ; Liquid crystals ; Metal insulator boundaries ; Optical waveguides ; Plasmonics ; Plasmons ; Refractive index ; Time domain analysis ; Waveguides

Electric Filters:703.2 ; Waveguides:714.3 ; Light/Optics:741.1 ; Chemical Operations:802.3 ; Mathematics:921 ; Atomic and Molecular Physics:931.3

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
2.Shandong Univ, Sch Informat Sci & Engn, Jinan 250000, Shandong, Peoples R China
3.Shandong Normal Univ, Sch Phys & Elect, Jinan 250014, Shandong, Peoples R China
4.Tianjin Univ, Sch Sci, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Tianjin 300072, Peoples R China

Yin, Shengtao,Liu, Yan Jun,Xiao, Dong,et al. Liquid-crystal-based tunable plasmonic waveguide filters[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2018,51(23).

Yin, Shengtao.,Liu, Yan Jun.,Xiao, Dong.,He, Huilin.,Luo, Dan.,...&Sun, Xiao Wei.(2018).Liquid-crystal-based tunable plasmonic waveguide filters.JOURNAL OF PHYSICS D-APPLIED PHYSICS,51(23).

Yin, Shengtao,et al."Liquid-crystal-based tunable plasmonic waveguide filters".JOURNAL OF PHYSICS D-APPLIED PHYSICS 51.23(2018).