Abstract
We report a multi-component nanocomposite material with large and ultrafast third-order nonlinearity, made of poly(3-hexylthiophene) doped with 1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)C61 and silver nanoparticles. Large nonlinear refractive index of the order of 10−7 cm2/W is reached by combining surface plasmon resonance enhancing nonlinearity and local-field enhancing nonlinearity. An ultrafast response time of 33.6 ps is achieved due to the enhanced charge transfer and exciton-exciton annihilation associated with surface plasmon resonance. An ultrafast photonic crystal all-optical switching with an ultralow pump intensity of 70 KW/cm2 is also realized.
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