How to suppress radiative losses in high-contrast integrated Bragg gratings

High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port m...

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Veröffentlicht in:Journal of the Optical Society of America. B, Optical physics Optical physics, 2023-04, Vol.40 (4), p.862
Hauptverfasser: Hammer, Manfred, Farheen, Henna, Förstner, Jens
Format: Artikel
Sprache:eng
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Zusammenfassung:High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port mode add strictly up to one. We consider a series of symmetric, fully and partly etched finite gratings, for parameters found in integrated silicon photonics. These can act as spectral filters with a reasonably flattop response. Apodization can lead to more box shaped reflectance and transmittance spectra. Together with a narrowband Fabry–Perot filter, these configurations are characterized by reflection bands, or transmittance peaks, with widths that span three orders of magnitude.
ISSN:0740-3224
1520-8540
DOI:10.1364/JOSAB.485725