DocumentCode :
3367174
Title :
Optimization of 2D slab photonic crystal geometry for gas sensing
Author :
Zakrzewski, Adrian ; Wielichowski, Marcin ; Patela, Sergiusz
Author_Institution :
Fac. of Microsyst. Electron. & Photonics, Wroclaw Univ. of Technol., Wroclaw, Poland
fYear :
2011
fDate :
8-10 July 2011
Firstpage :
147
Lastpage :
149
Abstract :
The two-dimensional (2D) slab photonic crystal (PhC) geometry is optimized for the application of the PhC as a near-infrared spectroscopic gas sensor´s active element. Sensor operation in the slow-light regime is assumed. The 2D theoretical model is based on the finite-difference time-domain (FDTD) propagation of the electromagnetic field. Linear-defect 2D photonic crystal structures are considered. Optimization is performed according to the following criteria: maximum light coupling efficiency, maximum light extraction efficiency, and maximum light-gas overlap. In the simulations, output signal collection is performed by means of either an output strip waveguide. Antireflection sections suited for individual PhC geometry types, are applied to prevent excessive reflections resulting from the high group velocity of light propagating in the slow-light regime within the PhC. Configurations with and without antireflection sections are compared. Triangular-lattice 2D PhC types are: line-defect crystals and line-defect crystals featuring an additional row of holes that improve the light-gas overlap.
Keywords :
electromagnetic wave propagation; finite difference time-domain analysis; gas sensors; geometric programming; 2D slab PhC geometry optimization; 2D slab photonic crystal geometry optimisation; FDTD; antireflection sections; electromagnetic field propagation; finite-difference time-domain; gas sensing; individual PhC geometry; line-defect crystals; linear-defect 2D photonic crystal structures; maximum light extraction efficiency; maximum light-gas overlap; near-infrared spectroscopic gas sensor active element; output strip waveguide; triangular-lattice 2D PhC; two-dimensional slab photonic crystal geometry optimization; Gas detectors; Optical sensors; Optical waveguides; Optimization; Photonic crystals; Photonics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Students and Young Scientists Workshop, 2011 International
Conference_Location :
Cottbus
Print_ISBN :
978-1-4577-1651-5
Type :
conf
DOI :
10.1109/STYSW.2011.6155863
Filename :
6155863
Link To Document :
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