講演情報
[11p-B11-9]Experimental Investigation of Dirac-Frequency-Dependent Topological Guided Modes in Valley Photonic Crystal Heterostructures
〇(M2)Xiaomeng Chi1, Chengkun Zhang1, Guangtai Lu1, Satoshi Iwamoto1,2 (1.RCAST,Univ. of Tokyo, 2.IIS,Univ. of Tokyo)
キーワード：
Photonic crystal、Topological waveguide、Heterostrcture waveguide
Valley photonic crystal heterostructure waveguides (VHWGs) provide a promising platform for topological light guiding. In this work, 3D numerical simulations and experimental investigations were carried out to study the influence of the Dirac frequency on guided-mode transport. Silicon-based VHWGs with different structural parameters were fabricated on an SOI platform. Infrared camera measurements confirmed guided-mode propagation in both straight and Z-shaped waveguides. The structure with a Dirac frequency closest to the center of the bulk bandgap exhibited the strongest output intensity. These results indicate that Dirac-frequency engineering is an effective approach for optimizing guided-mode transport in VPhC heterostructures.