High‐Efficiency All‐Optical Modulator Based on Ultra‐Thin Silicon/Graphene Hybrid Waveguides

• DOI: 10.1002/adom.202301549
• Publication Date: 2023-10-13T03:19:15Z
• Authors: Hongyuan Cao; Mingfei Ding; Haitao Chen; Chaoyue Liu; Laiwen Yu; Mingyu Zhu; Weike Zhao; Jingshu Guo; Huan Li; Zejie Yu; Shiming Gao; Daoxin Dai
• Keywords: Modulation (music)

Abstract All‐optical modulation plays a key role in next‐generation optical processing and has attracted enormous attention worldwide. With extraordinary optoelectronic characteristics friendly integration compatibility with various nanostructures, graphene shows great potential for ultrafast energy‐efficient all‐optical modulation. Here, high‐efficiency on‐chip is experimentally demonstrated based on ultra‐thin silicon/graphene hybrid waveguides, which are complementary‐metal‐oxide‐semiconductor‐compatible easy to fabricate. Owing the enhanced light‐graphene interaction enabled by silicon photonic platform, nonlinear absorption greatly depth of >2 dB achieved saturation threshold 0.9 pJ per pulse 50‐µm‐long modulator. The measured efficiency as high 0.052 µm −1 . Furthermore, proposed modulator operate at bandwidth hundreds gigahertz. present waveguides paves way toward applications information processing.