Title :
Ring-shaped two-dimensional photonic crystal structures showing large higher-order stop-bands
Author :
Zarei, Sanaz ; Shahabadi, Mahmoud ; Zarei, Ali
Author_Institution :
Photonics Res. Lab., Univ. of Tehran, Tehran, Iran
Abstract :
Large absolute higher-order stop-bands are realized in two-dimensional photonic crystals of a square lattice with ring-shaped features using a real-valued genetic algorithm. The idea of the photonic crystals with ring-shaped features comes from the phenomenon of formation of the Arago spot in the middle of circular patterns in the process of optical lithography. As a result of the optimization, two structures showing large absolute higher-order stop-bands are obtained. The maximum absolute bandwidth of the higher-order band-gaps for the obtained structures is 0.1646(2πc/a), which is larger than the so far reported values for higher-order bands.
Keywords :
genetic algorithms; optical fabrication; photolithography; photonic crystals; 2D photonic crystal structures; Arago spot; higher-order stop-bands; optical lithography; real-valued genetic algorithms; square lattice; Algorithm design and analysis; Bandwidth; Frequency; Genetic algorithms; Genetic engineering; Optical computing; Optical device fabrication; Photonic band gap; Photonic crystals; Shape; genetic algorithm; higher-order stop-bands; photonic band-gap materials; photonic crystals;
Conference_Titel :
Transparent Optical Networks (ICTON), 2010 12th International Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-7799-9
Electronic_ISBN :
978-1-4244-7797-5
DOI :
10.1109/ICTON.2010.5549312
