All-Optical Organic-Inorganic Hybrid Waveguide Switches Based on Photothermal Effect of Au-MOF Composites

In this study, all-optical organic-inorganic hybrid waveguide switches are proposed based on the photothermal effect of Au-MOF composites. The embedded waveguide structure is directly defined using SiO2 grooves on a silicon substrate. Self-synthesized Au-MOF/PMMA and SiO2-TiO2 network grafting PMMA are used as the core and cladding materials, respectively. The organic-inorganic hybrid shielding layer is formed using an oxygen ion etching process to avoid corrosion from the cladding solvent. A directional coupling switching structure is designed and fabricated. The switching time of the all-optical device is 500 mu s, the photothermal tuning sensitivity is 19.10 nm mW-1, the driving optical power consumption is 0.67 mW, and the extinction ratio is close to 9.83 dB. This technique is desirable for photothermal control of light in an all-optical signal-processing network. An all-optical waveguide switch based on photothermal effect of Au-MOF composites is designed and fabricated. The MOF structure provides a stable loading platform for Au nanoparticles in PMMA to improve the photothermal effect significantly. The organic-inorganic hybrid shielding layer is formed to avoid corrosion from the cladding solvent. The device shows low consumption, high sensitivity, and quick-responding. image