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Two-photon excited fluorescence from Pdots. A) Photograph of aqueous Pdot dispersions excited with an λ= 800 nm mode-locked Ti:sapphire laser. B) Single-particle imaging of PFPV dots with two-photon excitation. C) Log-log plot of two-photon fluorescence intensities versus the excitation power. D) Semi-log plot of two-photon action cross sections (σ2pϕ) versus the excitation wavelength. Reproduced from Ref. [48] with permission.
