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<p>In the present study, we propose two periodic structures, with the second structure coated by a metallic layer. While the designs of both structures are relatively simple, their performances vary significantly due to differences in material selection and arrangement. These structures are analyzed using the transfer matrix method, revealing their distinct optical behaviors. Photonic crystals are versatile structures capable of manipulating light in unique ways, making them ideal for various optical applications. These structures exhibit distinct photonic and plasmonic bandgaps by carefully engineering their layers and introducing metallic components, enabling advanced light confinement and selective transmission. Additionally, the bandgaps’ frequency range and central frequency are adjustable, offering greater flexibility in applications. In this work, we explore the impact of structural modifications, such as incorporating metallic layers and varying the number of repetitions in the unit cell, on the optical behavior of quaternary photonic crystals. The minimum photonic bandgap is determined to be 100&#xa0;nm, while the maximum reaches 307&#xa0;nm. In contrast, the plasmonic bandgap shows a minimum value of 802&#xa0;nm. The maximum plasmonic bandgap of 145&#xa0;GHz is observed, showcasing broadband filtering. Our work spans both the visible and infrared regions, demonstrating broad spectral coverage. Additionally, the photonic and optical properties are heavily influenced by the choice of materials, leading to a notable expansion of the bandgap across specific regions. Advanced computational methods, including FDTD and transfer matrix analysis, are employed to investigate angular dependencies, resonance peaks, and the effects of defect layers. These findings demonstrate the potential for precise control over light propagation, offering valuable insights for designing highly adaptable optical devices.</p>

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Customized bandgap engineering in plasmonic-photonic crystal structures for advanced broadband and narrowband optical filtering

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Sara Gholinezhad Shafagh,
  • Hassan Kaatuzian,
  • Mohammad Danaie

摘要

In the present study, we propose two periodic structures, with the second structure coated by a metallic layer. While the designs of both structures are relatively simple, their performances vary significantly due to differences in material selection and arrangement. These structures are analyzed using the transfer matrix method, revealing their distinct optical behaviors. Photonic crystals are versatile structures capable of manipulating light in unique ways, making them ideal for various optical applications. These structures exhibit distinct photonic and plasmonic bandgaps by carefully engineering their layers and introducing metallic components, enabling advanced light confinement and selective transmission. Additionally, the bandgaps’ frequency range and central frequency are adjustable, offering greater flexibility in applications. In this work, we explore the impact of structural modifications, such as incorporating metallic layers and varying the number of repetitions in the unit cell, on the optical behavior of quaternary photonic crystals. The minimum photonic bandgap is determined to be 100 nm, while the maximum reaches 307 nm. In contrast, the plasmonic bandgap shows a minimum value of 802 nm. The maximum plasmonic bandgap of 145 GHz is observed, showcasing broadband filtering. Our work spans both the visible and infrared regions, demonstrating broad spectral coverage. Additionally, the photonic and optical properties are heavily influenced by the choice of materials, leading to a notable expansion of the bandgap across specific regions. Advanced computational methods, including FDTD and transfer matrix analysis, are employed to investigate angular dependencies, resonance peaks, and the effects of defect layers. These findings demonstrate the potential for precise control over light propagation, offering valuable insights for designing highly adaptable optical devices.