Composite structures of resonant dielectric ridges on a dielectric slab waveguide near BICs realize flat-top reflection filters approximating Butterworth responses, with the reflection band made arbitrarily narrow without increasing device size.
Analysis of waveguide gratings: application of Rouard’s method
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Integrated flat-top reflection filters operating near bound states in the continuum
Composite structures of resonant dielectric ridges on a dielectric slab waveguide near BICs realize flat-top reflection filters approximating Butterworth responses, with the reflection band made arbitrarily narrow without increasing device size.