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Micro/nano photonic structures permit remarkable control of the propagation of light.A selection of recent results will be presented.Using two-dimensional photonic crystal made of the composite molecular materials with large and fast third-order optical nonlinearity,ultrafast and low threshold all-optical switching was demonstrated.Based on tunable Fano resonance or PIT of metallic nanostructures,ultrafast modulations on light transmission were also experimentally demonstrated.Moreover,ultracompact polymer-plasmonic switch was also experimentally demonstrated.