Investigation of Optical Properties of Graphene/Au Nanocubes by Discrete Dipole Approximation

In this article ‚the optical properties of Graphene/Au nanocubes have been studied for the different number of graphene layers on 1 or 2 faces of cubes. The extinction efficiency factor has been calculated in the near and far-field regime by the discrete dipole approximation (DDA) method. Our results show that the height of extinction’s peak decreases significantly, by increases number of graphene layers on nanocube. Moreover, the wavelength of surface plasmon resonance peak redshifts from 516 to 700 nm (this peak is due to dipole formed alonge the polarisation direction) , although the wavelength of the another peak stays constant about 230 nm(this peak is due to dipole formed perpendicular to the polarisation). In addition, with increasing size of nanocubes, the height of peaks decrease, the width of them increase and wavelength of plasmon peaks don’t show any shifts for a constant thickness of graphene. The results of this study may be used for fabrication of biological sensors at vis wavelength.