Abstract
Low reflectance can be obtained by both the pyramidal and conical shapes over a broadband range. Comparing the reflectance of different structure shapes and aspect ratios by the finite difference time domain (FDTD) method, it shows that the antireflective efficiency of the pyramidal structures is better than that of the conical structures. The polymer film of conical structured array was fabricated by holographic lithography and following replicating process. The experimental results show highly consistent with the simulation results.