In this paper, the band structure for 1-D photonic crystal structure, which is composed of two different dielectric layers in a one-dimensional pattern, obtained by transfer matrix method, is reported. It has been observed that the bandgap depends on the contrast of dielectric constant and thickness of dielectric layers. Further, it is found that the enhanced bandgap can be obtained by changing the dielectric contrast and thickness of the layers. Primary & Secondary bandgaps are also estimated and the bandgaps have been engineered with reference to their dependence on spacing between layers and dielectric contrasts. Further, we also report the band gap calculation of three different dielectric layers stacked in 1-D periodic structure. Such structure might find its application in the design & development of asymmetric planar photonic crystals
We present here an exact numerical procedure to obtain the propagation constants of multilayer lossy waveguides in which the complex eigenvalue problem is solved in real domain and hence it is most suitable for Personal Computers. We also report a first order technique in which once the real eigenvalue problem is solved the ohmic loss due to a small imaginary part is obtained analytically. 1
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