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<p>This paper presents the design and analysis of a high-performance photonic crystal-based concentric microring resonator incorporating topological edge states (TES) for enhanced optical performance and sensing applications. By utilizing an asymmetric nested ring structure with varying silicon rod radii, the study successfully induces TES at the interface of different topological regions, significantly improving the quality factor, mode confinement, and transmission efficiency. The proposed design achieves a Q-factor of 5513, sensitivity up to 9139&#xa0;nm/RIU, and a figure of merit of 4025. As a practical application, the proposed optimized photonic crystal-based concentric microring resonator is implemented as a highly sensitive gas sensor capable of detecting O₂, C₂H₂, C₂H₄, and C₂H₆ with high selectivity and precision. The simulation results, obtained through 2D FDTD modeling, confirm the effectiveness of the structure in compact, integrated optical sensing systems.</p>

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High-Q photonic crystal-based concentric microring resonator with topological edge states for ultra-sensitive gas sensing

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Dhiraj Kumar,
  • Jayanta Kumar Rakshit,
  • Chittaranjan Nayak,
  • Arka Roy Bin

摘要

This paper presents the design and analysis of a high-performance photonic crystal-based concentric microring resonator incorporating topological edge states (TES) for enhanced optical performance and sensing applications. By utilizing an asymmetric nested ring structure with varying silicon rod radii, the study successfully induces TES at the interface of different topological regions, significantly improving the quality factor, mode confinement, and transmission efficiency. The proposed design achieves a Q-factor of 5513, sensitivity up to 9139 nm/RIU, and a figure of merit of 4025. As a practical application, the proposed optimized photonic crystal-based concentric microring resonator is implemented as a highly sensitive gas sensor capable of detecting O₂, C₂H₂, C₂H₄, and C₂H₆ with high selectivity and precision. The simulation results, obtained through 2D FDTD modeling, confirm the effectiveness of the structure in compact, integrated optical sensing systems.