Enhanced Optical Absorption and Thermal-Optic Effect of PtSe2-on-Silicon Ultra-thin Micro-resonators

作者：Tianping Xu, Quan Yuan, Shuqi Xiao, Tiegen Liu, Hon Ki Tsang, Jiaqi Wang, Zhenzhou Cheng · 发表于：ACS Applied Materials & Interfaces · 年份：2025 · DOI：10.1021/acsami.4c20815 · 被引用次数：6 · 研究领域：Photonic and Optical Devices、Molecular Junctions and Nanostructures、Mechanical and Optical Resonators

Integration of low-dimensional platinum diselenide (PtSe 2 ) with silicon photonics, leveraging its suitable band gap, inherent CMOS compatibility, and minimal lattice mismatch, presents a promising avenue for advancing mid-infrared (mid-IR) integrated optoelectronic devices. However, the study of PtSe 2 -based heterogeneous silicon photonics is still in its nascent stage, particularly in the mid-IR spectral regime. Here, we demonstrate PtSe 2 -on-silicon racetrack microring resonators (MRRs) incorporating a ten-layer PtSe 2 film. The MRRs, benefiting from a large evanescent field and significant intra-cavity energy density enhancement, exhibit notably increased light−PtSe 2 interaction. Our findings reveal enhanced absorption coefficients of 0.577 dB/μm and 0.462 dB/μm alongside a resonance shift rate of 0.24 nm/mW at 2200 nm wavelengths.