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Angular tolerant resonant grating filters under oblique incidence
Anne Sentenac1, Anne-Laure Fehrembach
1Institut Fresnel, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6133, Faculté de Saint Jérôme (case 162), 13397 Marseille Cedex, France.
Summary
Resonant grating filters offer narrowband free-space filtering but struggle with angular tolerance. This study demonstrates a novel approach using a multimode waveguide and bi-atom grating to significantly enhance angular tolerance for practical applications.
Area of Science:
- Optics and Photonics
- Nanophotonics
- Waveguide Technology
Background:
- Resonant grating filters are alternatives to multilayer stacks for narrowband free-space filtering.
- Existing resonant grating filters exhibit limited angular tolerance under oblique incidence, restricting their use with standard collimated beams.
- This limitation hinders practical applications requiring angular flexibility.
Purpose of the Study:
- To overcome the angular tolerance limitations of resonant grating filters under oblique incidence.
- To enable the use of resonant grating filters with standard collimated incident beams.
- To maintain narrow spectral bandwidths while improving angular performance.
Main Methods:
- Utilized a multimode planar waveguide structure.
- Incorporated a bi-atom grating design.
- Analyzed the angular response and spectral bandwidth of the proposed filter configuration.
Main Results:
- Successfully increased the angular tolerance of the resonant grating filter.
- Achieved an angular tolerance compatible with standard collimated beams (0.2 degrees).
- Maintained a narrow spectral bandwidth of 0.1 nm under various oblique angles of incidence.
Conclusions:
- The proposed multimode planar waveguide with a bi-atom grating significantly enhances angular tolerance for resonant grating filters.
- This advancement allows for practical filtering applications using standard collimated beams under oblique incidence.
- The developed resonant grating filter offers a viable solution for narrowband free-space filtering with improved angular performance.