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<p>This work details the design and simulation of a linear variable optical filter (LVOF) that has been optimized for the mid-infrared (MIR) spectrum, specifically within the range of 2500–5500&#xa0;nm. The filter employs a silicon substrate and a distributed Bragg reflector (DBR) architecture composed of Si, Ge, and SiO<sub>2</sub> thin-film layers, incorporating a laterally tapered SiO<sub>2</sub> cavity to achieve continuous wavelength tuning. The implementation of high-contrast Si/SiO<sub>2</sub> and Ge/SiO<sub>2</sub> layer pairs enables broad spectral coverage with a reduced number of DBR periods while maintaining high reflectivity. Simulations demonstrate transmission exceeding 90%, cut-off depth below 0.1%, and spectral resolution between 0.6 and 5%. The proposed structure provides multichannel filtering capability using a monolithic design, enabling compact, low-cost MIR detection systems suitable for gas-sensing applications.</p>

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A linear variable optical filter for the mid-infrared spectrum

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Nisham Kumari,
  • Pijus Kundu,
  • Ashok Chauhan,
  • Manish Mathew,
  • Kuldip Singh

摘要

This work details the design and simulation of a linear variable optical filter (LVOF) that has been optimized for the mid-infrared (MIR) spectrum, specifically within the range of 2500–5500 nm. The filter employs a silicon substrate and a distributed Bragg reflector (DBR) architecture composed of Si, Ge, and SiO2 thin-film layers, incorporating a laterally tapered SiO2 cavity to achieve continuous wavelength tuning. The implementation of high-contrast Si/SiO2 and Ge/SiO2 layer pairs enables broad spectral coverage with a reduced number of DBR periods while maintaining high reflectivity. Simulations demonstrate transmission exceeding 90%, cut-off depth below 0.1%, and spectral resolution between 0.6 and 5%. The proposed structure provides multichannel filtering capability using a monolithic design, enabling compact, low-cost MIR detection systems suitable for gas-sensing applications.