Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters
Subwavelength dielectric gratings provide a means of narrowband spectral filtering by coupling to quasi-guided leaky modes, providing a high reflectivity background and narrowband transmittance via Fano resonance behavior. Geometrically asymmetric two-step gratings enable normal incidence filtering...
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IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8536401/ |
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| author | Michael Barrow Marty Scherr Jamie Phillips |
| author_facet | Michael Barrow Marty Scherr Jamie Phillips |
| author_sort | Michael Barrow |
| collection | DOAJ |
| description | Subwavelength dielectric gratings provide a means of narrowband spectral filtering by coupling to quasi-guided leaky modes, providing a high reflectivity background and narrowband transmittance via Fano resonance behavior. Geometrically asymmetric two-step gratings enable normal incidence filtering by accessing symmetry-protected leaky modes. The impact of asymmetry on leaky mode coupling and optical filter response are studied via simulation and described by the Fano resonance theory. The influence of asymmetry introduced by grating step height and angular cone of incidence are verified experimentally in silicon/air gratings in the long-wavelength infrared (8–14  <italic>μ</italic>m). |
| format | Article |
| id | doaj-art-b3ea4e49e8854e7f8e5d16dea012068d |
| institution | Matheson Library |
| issn | 1943-0655 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-b3ea4e49e8854e7f8e5d16dea012068d2025-07-01T23:43:10ZengIEEEIEEE Photonics Journal1943-06552018-01-011061810.1109/JPHOT.2018.28814788536401Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance FiltersMichael Barrow0https://orcid.org/0000-0002-4038-3451Marty Scherr1Jamie Phillips2Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, USADepartment of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, USADepartment of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, USASubwavelength dielectric gratings provide a means of narrowband spectral filtering by coupling to quasi-guided leaky modes, providing a high reflectivity background and narrowband transmittance via Fano resonance behavior. Geometrically asymmetric two-step gratings enable normal incidence filtering by accessing symmetry-protected leaky modes. The impact of asymmetry on leaky mode coupling and optical filter response are studied via simulation and described by the Fano resonance theory. The influence of asymmetry introduced by grating step height and angular cone of incidence are verified experimentally in silicon/air gratings in the long-wavelength infrared (8–14  <italic>μ</italic>m).https://ieeexplore.ieee.org/document/8536401/Gratingshyperspectral imagingsubwavelength structures |
| spellingShingle | Michael Barrow Marty Scherr Jamie Phillips Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters IEEE Photonics Journal Gratings hyperspectral imaging subwavelength structures |
| title | Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters |
| title_full | Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters |
| title_fullStr | Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters |
| title_full_unstemmed | Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters |
| title_short | Influence of Subwavelength Grating Asymmetry on Long-Wavelength Infrared Transmittance Filters |
| title_sort | influence of subwavelength grating asymmetry on long wavelength infrared transmittance filters |
| topic | Gratings hyperspectral imaging subwavelength structures |
| url | https://ieeexplore.ieee.org/document/8536401/ |
| work_keys_str_mv | AT michaelbarrow influenceofsubwavelengthgratingasymmetryonlongwavelengthinfraredtransmittancefilters AT martyscherr influenceofsubwavelengthgratingasymmetryonlongwavelengthinfraredtransmittancefilters AT jamiephillips influenceofsubwavelengthgratingasymmetryonlongwavelengthinfraredtransmittancefilters |