Design of Surface Plasmon Thermo-Optic Switch Based on Dielectric Loading
Although existing thermo-optic switches offer advantages such as lower power consumption and faster response times,their larger size and complex structures often limit their practical applications.To address this limitation,a novel compact and fast-response thermo-optic switch is proposed in this study.The switch is based on a dielectric-loaded surface plasmon microring resonator,which consists of a multi-layer material structure including PMMA,Au,SiO2,and Si layers.The Au layer serves both as a material for exciting surface plasmons and as a heater.Using finite element method analysis,the optical transmission mode,temperature distribution,and other properties of the thermo-optic switch were studied.Additionally,a photo-thermal multiphysics field coupling analysis method was employed to investigate the dynamic characteristics of the switch,such as the impact of optical signal transmission on the spectrum and response time of the microring thermo-optical switch,within the wavelength range of 1 530 nm to 1 570 nm.The research findings demonstrate that the microring thermo-optic switch exhibits a fast response speed and low heating power,with a rise time of 2.5 μs,a fall time of 6.8 μs,and an insertion loss of 0.13 dB.Moreover,the dielectric-loaded surface plasmons proposed in this study are compatible with traditional semiconductor manufacturing processes and exhibit excellent dynamic performance.Hence,this switch holds promising potential for optoelectronic integrated circuit applications.
thermo-optic switchmicro ring resonatordielectric loaded waveguidethermo-optic effectphotoelectric devicesilicon photonics
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