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Optical properties of point-defect nanocavity implemented in planar photonic crystal with various low refractive index cladding materials

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Abstract

This paper presents a theoretical investigation of the optical properties of a three missing holes point-defect 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 high-Q factors. Furthermore, we fine-tune the radius and position of the lateral-, upper-, and lower-boundary 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 high-Q factors.

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Acknowledgments

The authors are very grateful to the MIT ab initio group for allowing us to use their computation package and to Eric Cassan from University of Paris-Sud, Orsay, France, for scientific discussions.

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Authors and Affiliations

  1. Département Electronique et Télécommunication, Faculté des Sciences et de la Technologie, Université 8 Mai 1945, 24000, Guelma, Algeria

    Lazhar Kassa-Baghdouche

  2. Laboratoire Microsystèmes et Instrumentation (LMI), Faculté des Sciences de la Technologie, Université Constantine 1, 25000, Constantine, Algeria

    Lazhar Kassa-Baghdouche, Touraya Boumaza & Mohamed Bouchemat

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  1. Lazhar Kassa-Baghdouche
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Correspondence to Lazhar Kassa-Baghdouche.

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Kassa-Baghdouche, L., Boumaza, T. & Bouchemat, M. Optical properties of point-defect nanocavity implemented in planar photonic crystal with various low refractive index cladding materials. Appl. Phys. B 121, 297–305 (2015). https://doi.org/10.1007/s00340-015-6229-3

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