Analysis Of Optical Properties Of Nanoplasmonic Assemblies

Recently, Au or Ag nanobox, nanocage and nanoframe have become populartheranostic candicates, especially in medicine researches according to their uniqueoptical properties at surface plasmon resonance (SPR). The nanocages are wall-porousand interior-hollowed structures, which are good candidates for drug delivery andrelease system. As for these multi-functional advantages, they have been very popularin future application. However, all those applications are based on the opticalproperties. So We will analysis the plasmonic and optical properties of the nanocageand nanobox and nanoframe.In this paper, the FEM method is used to analysis the various kinds of nanoboxand nanocage and nanoframe. Our numerical results display that the wavelengthsof the plasmonic modes of Ag nanocage are almost linearly dependent on thesurface porosity, the larger the surface porosity, the more the red shift ofthese SPR modes.In addition, we also analysis two kinds of nanocage, corner-truncated andface-holed. Our results indicate that the plasmon modes of the two porous nanocagesare nearly equivalent and tunable, which are red-shifted from that of nanobox.However, the dependence of the plasmon band on the surface porosity of thecorner-truncated nanocage is higher than that of the face-holed one.The scattering and absorption efficiencies of the dimer very depend on thepolarization of the incident wave. When the polarization directory is the long axis ofdimer, the dipole mode of a monomer is divided into two coupling modes: thebonding and anti-bonding modes. Moreover, the gap of the dimer also has influenceon the optical behavior.In summary, through changing the porosity of the nanocage, we can getdifferent SPR band, so that we could find the proper applications.