文章基本信息

标题：FDTD Modelling of 1D Photonic Crystal comprised of Double Positive and Double Negative Metamaterial for Thermal Masking Application with CPML Absorbing Boundary Condition.
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作者：Alok Sharan ; M. Ashok Kumar ; N. P. Anusha 等
期刊名称：Defence Science Journal
印刷版ISSN：0976-464X
出版年度：2017
卷号：67
期号：2
页码：224-229
语种：English
出版社：Defence Scientific Information & Documentation Centre
摘要：Periodic structures of double positive and double negative metamaterial of thickness of λ/4 is designed to stop long-wave infrared and mid-wave infrared frequencies for masking from infrared detection devices. Band-gaps are obtained by calculating reflection and transmission coefficients at probe point close to the front and back faces of the periodic structure. 1D- finite difference time domain method is implemented in Matlab to study the electromagnetic wave propagation which is incident normal to a periodic stack of double positive and double negative metamaterial of having refractive indices of 9 and -6 respectively, at centre wavelength. Drude model is adapted to model double negative medium. Band-gap obtained are compared with the conventional photonic crystal by replacing the double negative medium with a double positive medium with the magnitude of refractive index same as that of double negative medium. Band-gap obtained confirms the presence of Zero-n͂ band-gap in DPS-DNG photonic crystal which is wider than the reflection band in conventional photonic crystal; nearly twice in mid-wave infrared region and five times in long-wave infrared region. A novel and highly efficient convolutional perfectly matched layer absorbing boundary condition is used to terminate the infinite computational finite difference time domain lattices.
关键词：Photonic crystal;Finite difference time domain;Zero-n͂ band gap;Double positive and double negative;Thermal imaging;Convolutional perfectly matched layer