Linear optical modeling on aluminum zig-zag thin films

The Al zig-zag sculptured thin film consists of two identical columns, the first nanocolumns (zig) are oriented at the angle χ, and the second nanocolumns (zag) are oriented at the angle (π- χ). The optical properties of these nanostructures were obtained using the transfer matrix method for linear s- and p- polarized incident lights in the wavelength range of ۳۰۰-۱۰۰۰ nm. The reflection and transmission spectra of the zigzag nanostructures with different arm numbers and lengths were obtained at different incident angles. The Bragg peaks begin to appear for zig-zag nanostructures of morethan ۴ arms for s- polarized light at angles greater than ۳۰. For zig-zag structures of ۴, ۸, and ۱۶ arms, one, two, and three Bragg peaks were observed, respectively. However, for p- polarized light, no Bragg peak was observed at any of the incident angles. Also, for the zig-zag structure of ۸ arms for s-polarized light at ۶۰ incident angles, the number of Bragg peaks increases with increasing arm length. In addition, the peaks created in the wavelengths below ۵۵۰ nm showed a red shift while the peaks that appeared in the wavelengths above ۵۵۰ nm showed a blue shift.

کلیدواژه ها:

Reflectance ، Transfer matrix ، Zig-zag nanostructure ، Linearly polarized light ، Bragg phenomenon