Design and modeling of photonic crystal Absorber by using Gold and graphene films

Document Type : Articles


1 Department of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

2 Istituto Italiano di Tecnologia (IIT), 00161 Rome, Italy


A novel absorber based on a one-dimensional photonic
crystal (PhC) is proposed by combining the absorption
property of gold and graphene films. We designed two
photonic crystals consisting of silicon and silicon
dioxide layers with lattice constants 125 and 260 that
alternate in one dimension. We placed a 125-nanometerthick
layer of graphene between the two photonic
crystals and an 8-nanometer-thick layer of gold at the
end of the second photonic crystal. When graphene is
placed between two photonic crystals, a topological edge
mode excitation creates a strong absorption
enhancement. In this study, the absorbing spectrums and
field distribution are analyzed by using the transfer
matrix and the 2.5 dimensional variational finite
difference time domain method (2.5 var.FDTD). The
absorption spectrum for different angles was studied
(θ=0 to 60), and more than 87 percent absorption can be
maintained for θ =40°. The results of our studies will
enhance the interaction between light and matter. Thus,
opening up the possibility of their application for the
absorption and modulation of light


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