Photonic crystal is a dielectric with periodic modulation of refractive index of constituent elements which results in photonic band-gap effect which is unique property of Photonic crystal. Such Band gap effect helps to analyse the optical performance of Photonic crystals. This paper deals with Photonic Band gap (PBG) calculations for two dimensional Photonic crystals and the effect of size that is radius of silicon pillar on PBG. Plane Wave Expansion (PWE) method is used for obtaining band structure.
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