We observed an ultrafast response as fast as 240 fs in a gold nanoparticle system, in a femtosecond optical Kerr shutter experiment. We successfully demonstrate 2.5 THz optical switching. The ultrafast response of the Kerr signal is explained by a simple model taking into account the self-diffraction of the pump pulse by the generated transient grating.
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Inouye et al. (1999) studied this question.
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