[MoB4] Novel vdW Heterostructures

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)

[MoB4-04] Near-Lossless Phase Modulators Using Hybrid Tungsten Oxyselenide/Graphene Transparent Electrodes

Shi Guo¹, 〇Sung-Gyu Lee¹, Xiangxin Gong¹, Sang Hoon Chae¹ (1. Nanyang Tech. Univ. (Singapore))

We present an optical phase modulator that has near-zero loss while maintaining high modulation efficiency by developing hybrid tungsten oxyselenide/graphene (TOS/Gr) electrodes. The TOS layer heavily p-dopes Gr, making it transparent at telecommunication wavelengths. Our complete device integrates this hybrid electrode with monolayer WS₂ on a silicon nitride microring platform, achieving modulation efficiency of 0.202 V*cm with only 0.08 dB extinction ratio variation. This breakthrough opens pathways for energy-efficient integrated photonics.