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Using photoinduced second-order non-linear optical methods, we have determined that monodisperse In 2 O 3 nanocrystals of size ∼11-24 nm incorporated into poly(methyl methacrylate) (PMMA) matrices possess significant second-order optical susceptibilities up to 17 pm V −1 at λ = 1.76 µm; this is almost one order higher than that of traditional nanolayers of In 2 O 3 . A substantial increase in the corresponding susceptibilities is dependent on a relatively high monodispersion of thedoi:10.1088/0957-4484/17/8/011 fatcat:5xjy2uy7mrdp5gzwd6pydsgh7e