Authors: Lazhar KassaBaghdouche Touraya Boumaza Mohamed Bouchemat
Publish Date: 2015/10/05
Volume: 121, Issue: 3, Pages: 297-305
Abstract
This paper presents a theoretical investigation of the optical properties of a three missing holes pointdefect cavity implemented in a planar photonic crystal with various low refractive index cladding materials To describe the cavity operation we analyze how the refractive index RI of the cladding material depends on the Q factor and resonant wavelength for both asymmetric and symmetric structures The results show that the radiation losses of the structures increase for decreasing RI contrast and that the Q factor drops dramatically We show that the periodicity of the RI of the cladding material is a critical consideration for realizing symmetric structures with highQ factors Furthermore we finetune the radius and position of the lateral upper and lowerboundary holes near the cavity edges which allows us to increase the Q factor of the planar photonic crystal cavity by a factor as large as 25 Q 104 These findings provide useful design rules for applications involving mechanically stable photonic crystal cavities with highQ factors
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