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We observed local enhancement of coherent anti‐Stokes Raman scattering (CARS) by isolated gold nanoparticles. CARS signals from adenine molecules of a DNA base attached to isolated gold nanoparticles were strongly enhanced owing to the electromagnetic enhancement at the local proximity of the particles. The localization of the enhancement was successfully observed by a CARS microscope using a collinear configuration of tightly focused lasers. The CARS spectrum of adenine was enhanced by a factor of 2000 and was in good agreement with the measured spontaneous Raman spectrum.
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Ichimura et al. (2003) studied this question.
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