Yoshimi Hironobu, Yamaguchi Takuto, Ishida Satomi, Ota Yasutomo, Iwamoto Satoshi
Opt Express. 2024 Feb 12;32(4):6382-6390. doi: 10.1364/OE.512196.
We numerically and experimentally demonstrate efficient light couplers between topological slow light waveguides in valley photonic crystals (VPhCs) and wire waveguides. By numerical simulations, we obtained a high coupling efficiency of -0.84 dB/coupler on average in the slow light regime of a group index n = 10 - 30. Experimentally, we fabricated the couplers in a Si slab and measured the transmitted power of the devices. We realized a high coupling efficiency of approximately -1.2 dB/coupler in the slow light region of n = 10 - 30, which is close to the result from the numerical simulations. These demonstrations will lay the groundwork for low-loss photonic integrated circuits using topological slow light waveguides.
我们通过数值模拟和实验证明了在谷光子晶体（VPhC）中的拓扑慢光波导与线波导之间存在高效的光耦合器。通过数值模拟，我们在群折射率n = 10 - 30的慢光区域平均获得了-0.84 dB/耦合器的高耦合效率。在实验中，我们在硅片上制作了耦合器并测量了器件的传输功率。在n = 10 - 30的慢光区域，我们实现了约-1.2 dB/耦合器的高耦合效率，这与数值模拟结果相近。这些演示将为使用拓扑慢光波导的低损耗光子集成电路奠定基础。
