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An aperiodic distributed Bragg reflector (A-DBR) based on Ga₅Ge₄₀Se₅₅ chalcogenide alloy and SiO₂ multilayers was designed for photonic applications in the visible region. The Ga₅Ge₄₀Se₅₅ alloy was synthesised via the conventional melt-quenching technique, and the optical constants of its thin films were precisely extracted using spectroscopic ellipsometry. These experimentally obtained dispersion data were employed in the numerical modelling of an 8-layer A-DBR stack comprising alternating Ga₅Ge₄₀Se₅₅ and SiO₂ layers. The simulated reflectance spectra reveal high reflectivity and excellent colour purity, making the structure suitable for a narrow-band, polarisation-independent colour filter. Unlike conventional periodic DBRs, the aperiodic design enables spectral flexibility and reduced side lobes, thereby enhancing the device’s filtering selectivity and performance. The proposed structure offers significant potential in integrated photonic circuits, optical sensing, and display technologies, addressing limitations of traditional pigment- or dye-based filters such as instability, angular dependence, and limited tuning capability.

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Aperiodic Distributed Bragg Reflectors Based on GaGeSe Chalcogenide Glass: Synthesis, Characterisation, and Numerical Investigation

  • 会议论文

  • 发表日期：

    2025年

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  • Arun Pappachan,
  • P. M. Sumayyabi,
  • Soumya Suresh,
  • Sheenu Thomas,
  • T. Priya Rose

摘要

An aperiodic distributed Bragg reflector (A-DBR) based on Ga₅Ge₄₀Se₅₅ chalcogenide alloy and SiO₂ multilayers was designed for photonic applications in the visible region. The Ga₅Ge₄₀Se₅₅ alloy was synthesised via the conventional melt-quenching technique, and the optical constants of its thin films were precisely extracted using spectroscopic ellipsometry. These experimentally obtained dispersion data were employed in the numerical modelling of an 8-layer A-DBR stack comprising alternating Ga₅Ge₄₀Se₅₅ and SiO₂ layers. The simulated reflectance spectra reveal high reflectivity and excellent colour purity, making the structure suitable for a narrow-band, polarisation-independent colour filter. Unlike conventional periodic DBRs, the aperiodic design enables spectral flexibility and reduced side lobes, thereby enhancing the device’s filtering selectivity and performance. The proposed structure offers significant potential in integrated photonic circuits, optical sensing, and display technologies, addressing limitations of traditional pigment- or dye-based filters such as instability, angular dependence, and limited tuning capability.