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A Novel Design of Photonic Crystal Directional Coupler with Ultra Short Coupling Length Using Core /Shell Rods Defect

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Abstract

In this paper, a novel method to diminish the coupling length and enhance the coupling coefficient in a two-dimensional (2D) photonic crystal (PC) directional coupler (DC)is investigated. The DC comprises two closely spaced linear waveguides separated by one row of silicon columns. In this new approach, we used core/shell (C/S) rods between the waveguides to reduce the coupling length. The C/S rod is obtained by etching a hole in the middle of the silicon rod. This modification leads to a very short coupling length of 5a, where a is the lattice constant of the structure. Simulation results show that increasing the inner core radius increases the coupling coefficient. The coupling properties have been numerically simulated and analyzed using the finite difference time domain (FDTD) and the plane-wave expansion (PWE) methods. Based on the modified structure, we analyzed the output spectrum of a very compact channel drop filter. The proposed modified design would offer significant potential for novel ultrasmall devices based on photonic crystal couplers.

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Data Availability

The datasets utilized in the manuscript are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. Laboratoire Hyperfréquences Et Semi-Conducteurs, Département d’électronique, Faculté Des Sciences de La Technologie, Université Frères Mentouri, Constantine 1, Constantine, Algerie

    Imane Chergui & Amel Labbani

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  1. Imane Chergui
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  2. Amel Labbani
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Contributions

A. L. supervised the project, and was the major contributor to draft the manuscript. I. C. developed the idea, participated in the design and the analysis of the study. All authors read and approved the final manuscript.

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Correspondence to Amel Labbani.

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Chergui, I., Labbani, A. A Novel Design of Photonic Crystal Directional Coupler with Ultra Short Coupling Length Using Core /Shell Rods Defect. Silicon 16, 2103–2109 (2024). https://doi.org/10.1007/s12633-023-02818-4

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