Photonics Research, Volume. 11, Issue 4, 575(2023)
Robust bound states in the continuum in a dual waveguide system
Fig. 1. Conventional BIC waveguide. (a) Schematic of the BIC waveguide. (b) Effective mode indices of the TM bound mode and the TE continuum modes with varying substrate width
Fig. 2. BIC in dual waveguide configuration. (a) Schematic of BICs consists of two waveguides with interval
Fig. 3. Numerically calculated coupling strength for dual BICs waveguides. (a) Effective indices of the symmetric TM bound modes (olive circles), antisymmetric TM bound modes (blue empty circles), and TE continuum modes (red stars) as a function of the silicon substrate width
Fig. 4. Propagation distance under varied waveguide gaps
Fig. 5. Cladding-layer-covered dual waveguide system. (a) Schematic of the dual waveguide system with a cladding layer. (b)–(f) Propagation length
Fig. 6. BIC in dual waveguide system with cladding layer. (a) Coupling strength
Fig. 7. Fabrication tolerance of (a) the dual waveguide system and (b) the single waveguide system.
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Zhiyuan Gu, Sen Jiang, Chang Liu, Nan Zhang. Robust bound states in the continuum in a dual waveguide system[J]. Photonics Research, 2023, 11(4): 575
Category: Silicon Photonics
Received: Jan. 6, 2023
Accepted: Feb. 3, 2023
Published Online: Mar. 10, 2023
The Author Email: Zhiyuan Gu (guzhiyuan@tyut.edu.cn), Nan Zhang (nanzhang@um.edu.mo)