Dual-band topological rainbows in Penrose-triangle photonic crystals
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION(2024)
摘要
Topological rainbows (TRs) possess the potential to separate and localize topological photonic states across different frequencies. However, previous works on TRs have been confined to a single -frequency band. Furthermore, the achievement of multiband TRs within a single structure is still a significant challenge. In this paper, a composed structure waveguide is designed based on Penrose -triangle photonic crystals. By adjusting the size of scatterers and introducing non -Hermitian terms, we successfully realize dual -band TRs. This achievement will not only enhance the uniformity of the electric field intensity distribution but also provide the potential to introduce a new avenue for the development of robust photonic devices dedicated to processing vast amounts of data information. (c) 2024 Optica Publishing Group
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