The Study Of The Structural Plasmon Resonance And Energy Transmission Properties Of The Metallic Nanoshell Particle Chain

Precious metals, especially gold (Au) and silver (Ag), is negative, its dielectric constant in the visible band of light rendering the characteristics of negative refractive index, can be used as a negative refractive index material, also referred to as a meta-material (Metamaterials). Metal nanoparticles of gold and silver has a unique and tunable optical properties due to the presence of surface plasmon resonance (Surface Plasmon Resonance), molecular imaging and spectral analysis, chemical and biological sensing, biomedical, nano-photonics devices potential applications. Especially dielectric core-metal cladding nano-particles, compared to the solid metal nano nanoparticles, the plasma optical characteristics more easily adjustable. Further, the wavelength of the plasmon resonance of the nano-particles of the metal coating layer is highly dependent on the relative dimensions of the metal cladding layer and a dielectric core. By reducing the thickness of the layer of metal cladding, the plasmon resonance wavelength can be moved from the visible light region of red to near-infrared region. The near infrared band tunability makes the metal cladding nanoparticles is ideal for optical biomedical imaging and sensing.The metal coating nanoparticles local characteristics of optical frequency electromagnetic field can be arranged as a chain structure which transmit light in the subwavelength space. This article studies the cladding of metal nano-particles chain the structure resonance characteristics and energy transfer characteristics. A detailed analysis of the influence of the resonance wavelength and energy transmission attenuation constant metal cladding thickness, particle spacing, medium refractive index of the core, the refractive index of the surrounding medium and the number of particles of metal nano-the cladding particle chain structure using finite element numerical simulation software COMSOL Multiphysics. Found that reducing the metal nano-coating thickness, particle chain structure of the dipole plasma resonance wavelength red shift in the resonance wavelength of the excitation energy transmission loss increased dramatically decreasing the coating thickness of the metal nano. Similarly, when the particle spacing decreases, the the dipole plasma structure of the particle chain resonance wavelength red shift in the resonance wavelength excitation under the transmission loss is also reduced. When the increase in the refractive index of the dielectric core, the by particle chains dipole plasma structure resonance wavelength also occurs the redshift phenomenon which, at the resonant wavelength excitation, energy transmission loss is also a corresponding increase in. Resonance wavelength redshift phenomenon occurs when increased refractive index of the surrounding medium, the the dipole plasma structure of the particle chain, and in the resonance wavelength excitation the energy minimum transmission loss when the refractive index of the surrounding medium, the medium is equal to the refractive index of the core, other case the energy transmission loss is greater than this value. Finally, when the increase in the number of particles, the particle chains dipole plasma structures resonance wavelength redshift continue to occur, and the energy transmission loss also increases.To sum up, the thickness of the metal coating layer in the cladding layer of the metal nano-particles in the chain, the distance between particles, the medium of refractive index of the core, the refractive index of the surrounding medium, and the number of particles are interested in a metal nano-particle chain structures of the cladding layer to the resonant wavelength and energy transmission loss generatedthe impact of the law. The understanding of these laws will cladding of metal nano-particles chain in the the optical plasmon application field in theoretical support.