Abstract
In this paper, the finite difference time domain (FDTD) method is used to simulate light propagating from a vacuum to a glass covered with a nano-porous film. By comparing the transmission ratio spectrum given from the model with the theoretical transmission ratio spectrum, the effective refractive index of the nano-porous film can be found. By simulating the nano-porous film with different porous ratios, we get different effective indices. On comparing these results with some theoretical models, it is found that the composite medium in series model is consistent with these effective indices simulated by the FDTD method. Finally, a broadband antireflection coating composed of the nano-porous film is proposed. On simulating this antireflection coating with the FDTD method, it is remarkable that the average transmission ratio is about 99.5% between 400 and 800 nm.
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