Abstract
We theoretically investigate the enhancement of optical absorption in organic thin films by embedding the periodic metallic nanostructures (NSs) inside the thin films. For the case study, one of the organic solar cell materials copper phthalocyanine (CuPc) has been used. Finite Different Time Domain technique has been used to illustrate the role of the several different shapes of the metallic NSs. It has been found that the NSs can result in broadband optical absorption enhancement. A study on the position of the metallic particles in the organic thin film and the effect of particle dimension on absorption has also been performed. A significant enhancement in the absorption in the wavelength range 350-550 nm has been observed. Furthermore, the investigation has been performed on the effect of the light source incident angle and polarization direction on the absorption in the organic thin films. The best incident angle is found at 75 degrees.