Optical Properties of Silver Hollow Triangular Nanoprisms
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The extinction spectra and electric field distributions of hollow triangular nanoprisms are calculated using the discrete dipole approximation method and compared with those of the solid triangular nanoprisms. When light propagates along the prisms, the main plasmon peaks of hollow triangular nanoprisms red shift compared with those of the solid triangular nanoprisms. At the main plasmon peaks, the hollow triangular nanoprisms provide more hot spots than the solid triangular nanoprisms. Therefore, the hollow triangular nanoprisms are more surface-enhanced Raman scattering active than the solid triangular prisms and can be used to detect small amount of molecules. For the hollow triangular nanoprism, although the local electric field distribution extremely relates to the incident polarization, the extinction spectra are independent of the incident polarization. In addition, the main plasmon peaks red shift linearly with the edge length, while they blue shift exponentially with the increase of the thickness of the hollow triangular nanoprisms. These results could be used to engineer hollow triangular nanoprisms for specific plasmonic applications.
KeywordsOptical property Silver Hollow triangular nanoprism Discrete dipole approximation
This work was supported by the National Science Foundation of China (Grant No. 10974157), the Fundamental Research Founds for the Central Universities (XDJK2009C078, XDJK2009A001), and the Southwest University Research Foundation (SWU109024).