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<p>Silicon-on-insulator (SOI) technology has become central to photonic integrated circuits (PICs) due to its CMOS compatibility, compactness, and high performance. This work presents a novel dual functionality 1D photonic crystal waveguide (PCW) that can be used as a sensor and the band reject filter. Mathematical modelling and simulations validate its functionality as an ultra-broad band-reject filter, achieving a 140 nm band reject bandwidth including S–C–L–U optical communication bands, making it suitable for wavelength-division multiplexing (WDM) systems. Beyond filtering, the same PCW is utilized for DNA sensing, leveraging its strong light matter interaction. The drop of 77% transmission change at 1500 nm is observed during the conformational shift from single-stranded (ssDNA) to double-stranded (dsDNA), corresponding to a sensitivity of ~ 1948 nm/transmittance.</p>

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Design and analysis of a silicon 1-D photonic crystal waveguide for wide band reject filtering and DNA sensing

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Shalini Vardhan,
  • Ritu Raj Singh

摘要

Silicon-on-insulator (SOI) technology has become central to photonic integrated circuits (PICs) due to its CMOS compatibility, compactness, and high performance. This work presents a novel dual functionality 1D photonic crystal waveguide (PCW) that can be used as a sensor and the band reject filter. Mathematical modelling and simulations validate its functionality as an ultra-broad band-reject filter, achieving a 140 nm band reject bandwidth including S–C–L–U optical communication bands, making it suitable for wavelength-division multiplexing (WDM) systems. Beyond filtering, the same PCW is utilized for DNA sensing, leveraging its strong light matter interaction. The drop of 77% transmission change at 1500 nm is observed during the conformational shift from single-stranded (ssDNA) to double-stranded (dsDNA), corresponding to a sensitivity of ~ 1948 nm/transmittance.