Title :
Complete bandgap in two dimensional photonic crystals with square bravais lattice
Author :
Habib, Md Ahsan ; Khan, Muhammad Sharifuzzaman ; Al-Amin, Chowdhury Golam Sufi ; Azad, Ibrahim ; Ullah, Saeed Mahmud ; Rafique, Shahida
Author_Institution :
Dept. of Appl. Phys., Electron. & Commun. Eng., Univ. of Dhaka, Dhaka, Bangladesh
Abstract :
Two- dimensional (2-D) photonic crystals (PhCs) of square lattice have been investigated to find the complete photonic bandgap. Band diagram calculations have been performed using the simulator “PWE band solver” of the software package optiFDTD™, based on plane wave expansion method. GaAs dielectric rods in air background with four different shapes have been considered. Filling fraction, rod/air hole orientation angle and material dielectric constant have been varied. It has been found that PhCs with square dielectric rods have the largest gap; the gap-midgap ratio is 5.39% when filling fraction f = 0.47 and orientation angle θ = 0°. It has also been found that the photonic band gap behavior for other types of material e.g. Si, Ge are similar to the GaAs and these materials can exhibit complete photonic band gap.
Keywords :
III-V semiconductors; dielectric materials; elemental semiconductors; gallium arsenide; germanium; permittivity; photonic band gap; photonic crystals; rods (structures); silicon; Filling fraction; GaAs; Ge; PWE band solver; Si; band diagram calculations; dielectric constant; dielectric rods; gap-midgap ratio; optiFDTD software package; photonic bandgap; rod-air hole orientation angle; square Bravais lattice; square lattice; two dimensional photonic crystals; Dielectric constant; Filling; Gallium arsenide; Lattices; Photonic band gap; Plane wave expansion method and Square lattice; complete two dimensional bandgap; orientation angle;
Conference_Titel :
Photonics (ICP), 2010 International Conference on
Conference_Location :
Langkawi, Kedah
Print_ISBN :
978-1-4244-7186-7
DOI :
10.1109/ICP.2010.5604411