FDTD Modelling of 1D Photonic Crystal comprised of Double Positive and Double Negative Metamaterial for Thermal Masking Application with CPML Absorbing Boundary Condition.

  • Alok Sharan Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry
  • M. Ashok Kumar Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry
  • N. P. Anusha Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry
Keywords: Photonic crystal, Finite difference time domain, Zero-n? band gap, Double positive and double negative, Thermal imaging, Convolutional perfectly matched layer

Abstract

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.

Author Biographies

Alok Sharan, Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry

Dr Alok Sharan, currently Assistant Professor in Department of Physics, Pondicherry University did his MSc (Physics) from University of Poona in 1990 and PhD from IIT Kanpur in 2000. He was a Visiting fellow at TIFR Mumbai and Postdoc Fellow at Materials Research Laboratory, The Pennsylvania State University PA, USA. His research interests are in experimental nonlinear optics and computational electromagnetics. He is group leader and initiated the work and the physics of the data analysed.

M. Ashok Kumar, Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry

Mr Ashok Kumar received his MSc (Physics) from Bharathidasan University in 2009. Currently he is pursuing his PhD at Pondicherry University. His research area includes computational electrodynamics using FDTD method, photonic crystal, metamaterial, experimental nonlinear optics. He designed, formulated the simulations and analysed the data.

N. P. Anusha, Department of Physics, Pondicherry University, R V Nagar, Kalapet, Puducherry
Mrs N.P. Anusha received her MSc in Physics from Pondicherry University in 2011. Currently she is doing her PhD at Pondicherry University. Her research topics include computational electrodynamics, metamaterials and photonic crystals. She contributed in the design, simulation and analysis of data.
Published
2017-03-14
How to Cite
Sharan, A., Kumar, M., & Anusha, N. (2017). FDTD Modelling of 1D Photonic Crystal comprised of Double Positive and Double Negative Metamaterial for Thermal Masking Application with CPML Absorbing Boundary Condition. Defence Science Journal, 67(2), 224-229. https://doi.org/10.14429/dsj.67.9850
Section
Missile System