期刊
PHOTONICS RESEARCH
卷 7, 期 11, 页码 1314-1322出版社
OPTICAL SOC AMER
DOI: 10.1364/PRJ.7.001314
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资金
- Russian Foundation for Basic Research [18-37-20038]
- Russian Federation Ministry of Science and Higher Education
- Russian Science Foundation [19-19-00514]
- Crystallography and Photonics Research Center of the RAS [007-GZ/Ch3363/26]
- Russian Science Foundation [19-19-00514] Funding Source: Russian Science Foundation
We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum (BIC) and enable spectral filtering of transverseelectric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing structure size. In addition to the filtering properties, the investigated structures support another type of BIC-the Fabry-Perot BIC-arising when the distances between adjacent ridges meet the Fabry-Perot resonance condition. In the vicinity of the Fabry-Perot BIC, an effect similar to electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip. (C) 2019 Chinese Laser Press
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