Selective controlling transverse plasmon spectrum of pentagonal gold nanotube: from visible to near-infrared region

In this paper, the optical properties and local electric field distribution of transverse plasmon mode of a single pentagonal gold nanotube are studied for the first time by the discrete dipole approximation (DDA). We find that the transverse plasmon peaks can nonlinearly red shift from visible to infrared region via controlling the inner diameter. In addition, the transverse plasmon peak firstly blue shifts and then red shifts in the visible region with the increase of outer diameter. Further analysis shows that the spectra red shift with the increase of outer diameters when scattering is dominant. Local electric field analysis reveals that transverse plasmon resonance peaks of gold nanotube mainly come from dipole resonance. When the tube wall is thin enough, multi-polar plasmon resonance mode will be generated, and the number of peaks will be increased. The surface charges of inner and outer tube walls are changed by tuning the inner diameter and outer diameter parameters of pentagonal gold nanotube. The selective controlling transverse plasmon spectra of gold nanotube are realized, which is of great significance to the study of optical properties of gold nanotube and the application of molecular detection and biological imaging.

Automated summary

This paper investigates the optical properties and local electric field distribution of the transverse plasmon mode of a single pentagonal gold nanotube using the discrete dipole approximation (DDA) for the first time. The study shows that the transverse plasmon peaks can shift nonlinearly from visible to infrared region by controlling the inner diameter, and the number of peaks increases when the tube wall is thin enough. By tuning the inner and outer diameter parameters, selective control over the transverse plasmon spectra of gold nanotube can be achieved, which is significant for the study of optical properties and applications in molecular detection and biological imaging.