Polarization dependent formation of femtosecond laser-induced periodic surface structures near stepped features

Laser-induced periodic surface structures (LIPSS) are formed near 110 nm-tall Au microstructured edges on Si substrates after single-pulse femtosecond irradiation with a 150 fs pulse centered near a 780 nm wavelength. We investigate the contributions of Fresnel diffraction from step-edges and surfac...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (23)
Main Authors: Murphy, Ryan D., Torralva, Ben, Adams, David P., Yalisove, Steven M.
Format: Article
Language:English
Subjects:
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFRACTION
DISTRIBUTION
EXCITATION
Fresnel diffraction
GOLD
IRRADIATION
LASER RADIATION
Lasers
MICROSTRUCTURE
PERIODICITY
Polaritons
POLARIZATION
SILICON
Silicon substrates
SUBSTRATES
SURFACES
WAVELENGTHS
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Summary:Laser-induced periodic surface structures (LIPSS) are formed near 110 nm-tall Au microstructured edges on Si substrates after single-pulse femtosecond irradiation with a 150 fs pulse centered near a 780 nm wavelength. We investigate the contributions of Fresnel diffraction from step-edges and surface plasmon polariton (SPP) excitation to LIPSS formation on Au and Si surfaces. For certain laser polarization vector orientations, LIPSS formation is dominated by SPP excitation; however, when SPP excitation is minimized, Fresnel diffraction dominates. The LIPSS orientation and period distributions are shown to depend on which mechanism is activated. These results support previous observations of the laser polarization vector influencing LIPSS formation on bulk surfaces.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4882998