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We demonstrate picosecond time-resolved pump-probe experiments with subwavelength resolution using a reflection near-field scanning optical microscope (NSOM). The sample was a laterally patterned gold nanostructure. Strain-induced reflectivity changes as low as ΔR/R≊10−4 were detected in the near-field.
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Vertikov et al. (1996) studied this question.
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