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Chao Liu,Jingwei Lv,Famei Wang,Qiang Liu,Haiwei Mu,Tao Sun,Qiang Liu,Paul K. Chu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
Multilayered nanoshells have attracted much attention due to their unique optical, electronic and magnetic properties. In this work, numerical calculation using discrete dipole approximation (DDA) is conducted to investigate the quad-layered metal nanoshell consisting of a particle with a dielectric silica (SiO2) core, inner cadium sulfide (CdS) shell, middle indium tin oxide (ITO) shell and outer metal silver (Ag) shell. The phenomenon is interpreted by plasmon hybridization theory and the Ag–ITO–CdS–SiO2 multilayered nanoshells are studied by extinction spectra of localized surface plasmon resonance. The variation in the spectrum peak with nanoparticle thickness and refractive index of the surrounding medium is derived. The electric field enhancement contour around the nanoparticles under illumination is analyzed at the plasmon resonance wavelength. The |ω-->, |ω+->, and |ω-+> modes red-shift with the refractive index of the surrounding medium and increase in the layer thickness causes either blue-shift or red-shift as shown by the extinction spectra. The mechanism of the red-shift or blue-shift is discussed. The |ω--> blue-shifts and furthermore, the |ω-+> and |ω+-> modes of the Ag coated multilayered nanostructure are noticeable by comparing the extinction efficiency spectra of the Au–ITO–CdS–SiO2 and Ag–ITO–CdS–SiO2 multilayered nanoshells.
Analysis of Local Surface Plasmon Resonance in Multilayered Au/Ag/Graphene Nanoshells
Chao Liu,Zhaoting Liu,Jingwei Lv,Tao Sun,Qiang Liu,Haiwei Mu,Paul K. Chu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5
"The localized surface plasmon resonance (LSPR) properties of Au/Ag/graphene nanoshells are studied by discrete dipole approximation (DDA). The coupled resonance wavelengths show a remarkable dependence on the graphene thickness as well as refractive index of the surrounding medium. The resonance wavelengths of Au/Ag/graphene nanoshells red-shift as the thickness of the graphene layer is increased, when the radii of the Au core and Ag interlayer are 40 nm and 45nm, respectively. Specifically, the longer wavelength red-shifts from 540 nm to 740 nm when the refractive index varies from 1.25 to 2.05. "
Localized Surface Plasmon Resonance Properties of Concentric Dual-Ring Nanodisk
Haiwei Mu,Jianxin Wang,Qiang Liu,Wei Liu,Xianli Li,Jingwei Lv,Chao Liu,Famei Wang,Tao Sun,Paul K. Chu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
The extinction spectral properties based on localized surface plasmon resonance (LSPR) of the concentric dual-ring nanodisk (CDRN) structure are investigated by discrete dipole approximation (DDA) and plasmon hybridization theory. The CDRN nanostructure shows flexible tunable multipole resonances in the near-infrared regime and the coupled resonance wavelengths depend on the structural parameters of the nanostructure, which has great potential in multichannel LSPR-based bio-sensing applications.
A Study on Optimum Design Method of Gear Transmission System for Wind Turbine
Jing Wei,Cheng Lv,Wei Sun,Xiang Liu,Yang Wang 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
As the key components of wind turbine, the weight of gear transmission system becomes larger and larger with the increasing power of wind turbine. Lightweight and high reliability has been the developing tendency for planetary gear transmission system for working reliability and reducing costs. A coupled nonlinear dynamics modeling for planetary gear transmission system in wind turbine is established after comprehensive considering these non-linear factors associated with time-varying mesh stiffness, dynamic transmission error, gear mesh impact and input varying load. Load factors of planetary gear transmission system are induced from the coupled nonlinear dynamics modeling. Then a novel optimum design approach including lightweight and reliability as constraints is presented. The optimization results show that the reliability of original parameters is higher than that of the optimized parameters,while the volume of planetary gear transmission system can greatly be decreased with the overall system reliability requirements.