Comparison of photonic crystal narrow filters with metamaterials and dielectric defects |
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Authors: | E Lotfi K Jamshidi-Ghaleh F Moslem and H Masalehdan |
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Institution: | (1) Department of Physics, The American University in Cairo, 113 Kasr El Aini St., P.O. Box 2511, Cairo, 11511, Egypt;(2) Yousef Jameel Science and Technology Research Center (STRC), The American University in Cairo, 113 Kasr El Aini St., P.O. Box 2511, Cairo, 11511, Egypt |
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Abstract: | The photonic band-gap of the two kinds of 1D photonic crystal structure
which is composed of the form of (AB)
N1
C
m
(BA)
N2
, one with a
metamaterial defect layer (MDL) and the other one with a dielectric defect
layer (DDL) are studied. Our results show that in both cases, where there is
only one defect layer, m=1, no defect mode exists, but for two defect
layers (m=2) there is a single defect mode which is centered in the middle
of the band-gap. The width of the defect mode in DDL is narrower than that
in MDL. For a number of defects of more than two (m>2) and even, in both of
the MDL and DDL structures, there is only one defect mode. For m>2 and
odd, the defect mode in the MDL vanishes, but for DDL there is two defect-mode symmetrically centered in the middle of the
band-gap. The effects of the
defect layers refractive index value, the periodicity number of the
structures and the incident angle on the properties of the defect modes and
the transmittance spectrum are discussed. |
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Keywords: | |
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