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Influence of defect layer of ZnS/air on one dimensional photonic crystal structure of gallium phosphide-crown glass using lumerical FDTD



  1. Department of Applied Physics, AIAS, Amity University, Noida, U.P.-201303, India
  2. Experimental Research Laboratory, Department of Physics, ARSD College, University of Delhi, Dhaula Kuan, New Delhi-110021, India


The reflectance characteristics of defect modes in a one-dimensional photonic crystal structure are studied theoretically using Lumerical FDTD software. Photonic crystal (PC) consisting of alternating layers of Gallium Phosphide and crown glass are modelled along with dielectric defect layers of ZnS and Air. The reflectance spectra of PC have been studied without defect layer and for different thicknesses of defect layer by simulation. The reflectance spectrum of PC without defect displayed 100% reflectivity in the near-IR region owing to its high refractive index and indirect band gap. The introduction of defect layer in PC modified the spectra by displaying one or more peaks due to modification in periodicity of PC. The spectra exhibited that variation in thickness of a defect layer (ZnS) impacted the tunability of photonic band gap without altering other characteristics in conventional PCs. Furthermore, the impact of dielectric defect layer (ZnS) is also compared with layer of Air and impact of Air is found to be prominent than that of ZnS. The origin of double defect modes with larger thickness are validated with electromagnetic theory. These results suggests that photonic crystal of Gallium Phosphide and Crown Glass with dielectric defect layer of ZnS/Air has potential for tunable tunnelling/transmission modes for suitable photonic, frequency filtering, optoelectronic and optomechanical applications..


Photonic crystal structure, Defect modes, Tunnelling, Refractive index.

Submitted at: Aug. 18, 2021
Accepted at: June 7, 2022


K. PRATIBHA, MANISH SINGH, S. SONI, TANNU GARG, VINITA TULI, S. GAURAV, S. SHANKAR, Influence of defect layer of ZnS/air on one dimensional photonic crystal structure of gallium phosphide-crown glass using lumerical FDTD, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 5-6, pp. 230-235 (2022)