We have demonstrated surface plasmon polaritons excited on Si transiently metalized with an intense femtosecond laser pulse by measuring the reflectivity of a Si grating changed in the incident angle of the fs pulse. We observed that the incident angle where the sharp dip of the reflectivity appeared was changed by the thickness of SiO2 films. The result demonstrates that the plasmon wavelength is controlled through SiO2 film deposited on Si.
We report that few-cycle laser pulses at low fluence can produce sub-100 nm periodic nanostructures on DLC surfaces through nanoablation induced by short-range surface plasmon polaritons (SR-SPPs). The 7-fs and 100-fs laser pulses from Ti:sapphire lasers were used. The period of the nanostructures with 7-fs pulses was much smaller than those with 100-fs pulses. The Raman spectrum showed that the modified layer in a DLC surface irradiated with 7-fs pulses was thinner than that with 100-fs. By using a model target, the period calculated for the excitation of SR-SPPs was in good agreement with that in the experiments.
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