Properties of twofold broad and narrow band filter doped with 1-D photonic crystal
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1.
College of Computer Science and Information Engineering, Chongqing Technology and Business University, Chongqing 400067, China
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Received Date:
2009-04-14
Accepted Date:
2009-06-11
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Abstract
In order to study the twofold properties of broad and narrow filter doped with 1-D photonic crystal,the peak transmissivity and full width at half maximum(FWHM)were calculated based on the transfer matrix.It was found that when the refractive index is increased the narrow band's peak transmissivity is invariable and the FWHM is increased,the broad band's transmissivity of the edge of the peak is increased and the FWHM is decreased.When the extinction coefficient is increased the narrow band's peak is decreased rapidly and the broad band's peak is decreased rapidly before decreased adagio,the FWHM is increased.A valuable conclusion is drawn that the refractive index is choice with different demand of the design of a twofold phonic crystal filter and the absorption of dopant has to be taken into account for the design of the twofold phonic crystal filter.
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