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<p>We explore the potential of cavity resonator integrated grating filters (CRIGF) to create ultra-narrowband spectral Fabry-Pérot filters with enhanced angular tolerance. We propose and demonstrate the merits of a design methodology that first considers a simple grating coupler based Fabry-Pérot filter, before proceeding to computationally intensive CRIGF simulations. Our analysis focuses on the performance of the designed filters when illuminated by a highly focused beam. Using rigorous calculations with a full 3D incident Gaussian beam, we show that these 2D structures exhibit strong angular sensitivity along the direction parallel to the grating grooves when resonance bandwidths are ultra narrow. Theoretically, we achieve a <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sim\)</EquationSource> </InlineEquation>0.2&#xa0;nm bandwidth transmission filter under illumination by a Gaussian beam spanning only ten wavelengths. The weak angular tolerance in the direction parallel to the grating grooves is identified as a limitation for structures that are invariant along this axis.</p>

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Narrowband Fabry-Pérot filters based on cavity resonator integrated grating filters

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Anne-Laure Fehrembach,
  • Julien Lumeau,
  • Antonin Moreau,
  • Kumar Kinjalk,
  • Stéphane Calvez,
  • Olivier Gauthier-Lafaye,
  • Antoine Monmayrant

摘要

We explore the potential of cavity resonator integrated grating filters (CRIGF) to create ultra-narrowband spectral Fabry-Pérot filters with enhanced angular tolerance. We propose and demonstrate the merits of a design methodology that first considers a simple grating coupler based Fabry-Pérot filter, before proceeding to computationally intensive CRIGF simulations. Our analysis focuses on the performance of the designed filters when illuminated by a highly focused beam. Using rigorous calculations with a full 3D incident Gaussian beam, we show that these 2D structures exhibit strong angular sensitivity along the direction parallel to the grating grooves when resonance bandwidths are ultra narrow. Theoretically, we achieve a \(\sim\) 0.2 nm bandwidth transmission filter under illumination by a Gaussian beam spanning only ten wavelengths. The weak angular tolerance in the direction parallel to the grating grooves is identified as a limitation for structures that are invariant along this axis.