Optics and Photonics Society of Iran

Abstract- In this paper, the optical response of a periodic nanodipole array of gold and silver has been investigated. The absorption power for different values of the length and thickness of the nanodipole has been simulated and analyzed. It has been shown that by increasing the length and the thickness of the nanodipole, the resonance wavelength shifts to the higher and lower wavelengths, respectively. The results can be used for design of a nanoantenna at the specific wavelength and obtaining the relation between the optical response and the geometry of the antenna. Moreover, due to the narrower absorption spectra of silver, compared to gold, silver is more appropriate for sensing applications and also it is more economical. The simulations are based on the finite-difference time-domain (FDTD) numerical method.