Photonic technologies are emerging as powerful enablers for neuromorphic computing by delivering ultrafast and energy efficient neural functionalities. In this work, we propose and demonstrate a novel all-optical dual micro ring resonator architecture incorporating the phase change material Ge2Sb2Te5 (GST) to implement highly precise nonlinear activation functions (NLAFs). Our approach introduces angular positioning of GST segments within the rings, enabling fine-grained control over optical transmission dynamics. Through a systematic evaluation of sixteen distinct phase configurations, we identify an optimal GST placement 180 deg in the first ring and 90 deg in the second that achieves ultra narrowband transmission with a full width at half maximum (FWHM) of just 0.47 nm. This dual ring configuration provides two distinct resonant wavelengths, facilitating enhanced nonlinear modulation and multi level optical signal processing that closely mimics biological neuron behavior. Notably, the device achieves high contrast transmission, 0 to 0.85, across a 4 nm spectral window while operating at significantly reduced temperatures (100 deg C), outperforming traditional GST based designs.
Furthermore, the dual-ring architecture enables independent optimization of spectral selectivity and switching contrast capabilities previously unattainable with single ring structures. These results establish a promising pathway toward scalable, high speed neuromorphic photonic systems, offering both the precision and switching speed required for practical on chip neural processing.
Photonic neuromorphic processing with coupled spiking silicon microrings
Institute of Photonics, Department of Physics, University of Strathclyde（斯特拉斯克莱德大学物理学院光子学研究所）；Nanoscience Laboratory, Department of Physics, University of Trento（特伦托大学物理学院纳米科学实验室）
Color symmetry breaking in a nonlinear optical microcavity
Gleb Wataghin Institute of Physics, University of Campinas（坎皮纳斯大学格莱布·瓦塔金物理研究所）；Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）；Department of Physics, Friedrich Alexander University Erlangen-Nuremberg（埃尔朗根-纽伦堡弗里德里希·亚历山大大学物理系）；Department of Electrical and Photonics Engineering Technical University of Denmark（丹麦技术大学电气与光子工程系）；Instituto de Física, Universidade de São Paulo（圣保罗大学物理研究所）
