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Analysis of engineered opals for photonic band gap properties at visible wavelengths

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Title Analysis of engineered opals for photonic band gap properties at visible wavelengths
 
Creator VIJAYA, R
PRASAD, T
 
Subject spontaneous emission
conducting polymers
sio2 nanospheres
crystals
spheres
dye
enhancement
molecules
systems
range
photonic crystals
opals
sintering
transfer matrix method
 
Description We have performed calculations using a modified Transfer Matrix method to study the photonic band gap properties of bare opals of different diameters, different number of layers, sintered opals with filling fractions varying between 0.74 and 1.00, partial and complete coating with semi-conducting GaN and lastly, inverted opals. The two prominent directions of [00 1] and [ 111 ] have been analyzed. Sintering improves the pseudo-gap and shifts the energy range of its occurrence, while partial coating gives a larger fall in transmission coefficient than complete coating. Inverted opals in GaN background show a stop band with lower transmission coefficient compared to coated opals due to an improvement in dielectric contrast. Our computational approach with the modified transfer matrix method based on a cubic unit cell in spherical polar coordinates is easier to implement with comparable accuracy as other methods to study electromagnetic wave propagation in different directions.
 
Publisher INDIAN ASSOC CULTIVATION SCIENCE
 
Date 2011-08-02T10:02:53Z
2011-12-26T12:53:50Z
2011-12-27T05:40:53Z
2011-08-02T10:02:53Z
2011-12-26T12:53:50Z
2011-12-27T05:40:53Z
2003
 
Type Article
 
Identifier INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE-PART B, 77B(2), 201-205
0252-9254
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8755
http://hdl.handle.net/10054/8755
 
Language en