Hybrid Bound States in the Continuum in Terahertz Metasurfaces

By Junxing Fan, Zhanqiang Xue, Han Wang, Longqing Cong. 2023 Cross Strait Radio Science and Wireless Technology Conference (CSRSWTC), 2023

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Here, we propose a scheme to further reduce scattering losses and improve the robustness of symmetry-protected bound states in the continuum (BICs) by decreasing the radiation density with a hybrid BIC lattice. We observe significant increase of radiative Q in the hybrid lattice compared to uniform lattice with a factor larger than 14.6. In the hybrid BIC lattice, modes are transferred to T point inherited from high symmetric X, Y and M points in the Brillouin zone that reveal as multiple Fano resonances in the far field and would find applications in hyperspectral sensing. This work initiates a novel and generalized path toward reducing scattering losses and improving the robustness of BICs in terms of lattice engineering that would release the rigid requirements of fabrication accuracy and benefit applications of photonics and optoelectronic devices.

Subfields: Civil and Structural Engineering, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/f8e36b7d1ba15877efa826da01c6eecad74bfc9e