Simulation Study on Extinction Characteristics of Gold-Silver Nanoshuttles

In order to study the extinction characteristics of gold-silver nanoshuttles, finite difference time domain (FDTD) method was used to simulate the models of gold-silver nanoshuttles with different diameter-length ratios, diameters and cone angles. The simulation results show that with the increase of aspect ratio, the longitudinal absorption peak of the gold-silver nanoshuttles shifts red, while its transverse absorption peak does not change significantly; the longitudinal absorption peak also shifts red with the increase of the length of the central nanorod; and the transverse absorption peak of the gold-silver nanoshuttles shifts blue with the increase of the angle of cone.