首页|Optical absorption engineering in dispersive band structure of MWCNTs array:design and optimization of total absorber for NIR to MIR regime
Optical absorption engineering in dispersive band structure of MWCNTs array:design and optimization of total absorber for NIR to MIR regime
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In this paper,we design a total infrared(IR)absorber based on a dispersive band structure of two-dimensional(2D)multiwall carbon nanotube(MWCNTs)square array working from near IR(NIR)to mid IR(MIR)regime.The ab-sorption characteristics have been investigated by the 2D finite-difference time domain(FDTD)method in square lattice photonic crystal(PC)of the multipole Drude-Lorentz model inserted to the dispersive dielectric function of MWCNTs.Dispersive photonic band structure and scattering parameters for the wide range of lattice constants from 15 nm to 3 500 nm with various filling ratios have been calculated.The results show that for large lattice constant(＞2 000 nm),the Bragg gap moves to the IR regime and leads to MWCNTs arrays acting as a total absorber.For a structure with lattice constant of 3 500 nm and filling factor of 12％,an enhanced absorption coefficient up to 99％is achieved in the range of 0.35 eV(λ=3.5 pm)nominated in the MIR regime.Also,the absorption spectrum peak can be tuned in the range of 0.27-0.38 eV(λ=4.59-3.26 pm)with a changing filling factor.Our results and methodology can be used to design new MWCNTs based photonic devices for applications like night-vision,thermal detector,and total IR absorbers.
Bita Etemadi、Alireza Mobini
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Department of Electrical and Computer Engineering,Qom University of Technology,Qom,Iran
Department of Electrical and Computer Engineering,Islamic Azad University Tehran North Branch,Tehran,Iran
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