Abstract
This Letter reports the formation of periodic surface structures on
Ni–Fe film irradiated by a single femtosecond laser pulse. A concave lens
with a focus length of −150 mm is placed in front of an objective (100×,
NA=0.9), which transforms the Gaussian laser field into a ring
distribution by the Fresnel diffraction. Periodic ripples form on the
ablation area after the irradiation of a single femtosecond laser pulse,
which depends on the laser polarization and laser fluence. We propose that
the ring structure of the laser field leads to a similar transient
distribution of the permittivity on the sample surface, which further
launches the surface plasmon polaritons. The interaction of the incident
laser with surface plasmon polaritons dominates the formation of periodic
surface structures.
© 2017 Chinese Laser Press
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription