[10a-N221-1~10] 3.10 Photonic structures and phenomena

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[10a-N221-5] Fabrication and Evaluation of a Metal-Loaded Si Waveguide for Generating OAM Light

〇Masato Takiguchi^1,2, Ryuji Kuruma³, Yuto Moritake³, Eiichi Kuramochi^1,2, Hisashi Sumikura^1,2, Masaya Notomi^1,2,3 (1.NTT NPC, 2.NTT BRL, 3.Science Tokyo)

Keywords:

Non-Hermitian,OAM,Waveguide

OAM light can be realized by appropriately optimizing non-Hermitian systems that break mirror symmetry. We have previously investigated OAM generation via complex perturbations, including devices based on GaN hollow nanowires[1] coupled with metallic structures [2], and systems incorporating scattering loss through engineered hole geometries [3]. Additionally, we have performed structural optimization using Si rectangular waveguides [4]. In this study, we fabricated the optimized structure and successfully observed interference patterns characteristic of OAM.
[1] M. Takiguchi, et.al., ACS Photonics, 11, 789 (2024)
[2] Kuruma, Takiguchi, et.al., JSAP spring meeting 2024, 23a-11E-1
[3] Lim, Takiguchi, et.al., JSAP spring meeting 2025, 15a-K505-4
[4] Kuruma, Takiguchi, et.al., JSAP autumn meeting 2024, 19a-A33-5