260 Gbit/s PAM-4 Waveguide-Integrated Graphene Photodetector with >110 GHz Bandwidth based on Hybrid Plasmonic Slot Structure. - Hejie Peng; Zhiqiang Quan; Lidong Zhang; Yuwei Zhuang; Yibo Feng; Ruiqi Liu; Jing Du 005; Wenyu Zhao; Jian Wang 060 (OFC, 2026)