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Author Miyazaki, Kenzo ♦ Miyaji, Godai ♦ Inoue, Toshishige
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABLATION ♦ AIR ♦ EXCITATION ♦ INTERFERENCE ♦ IRRADIATION ♦ LASERS ♦ LAYERS ♦ METALS ♦ MORPHOLOGICAL CHANGES ♦ NANOSTRUCTURES ♦ OXIDES ♦ POLARONS ♦ PULSES ♦ STAINLESS STEELS ♦ SUBSTRATES ♦ WAVELENGTHS
Abstract It is demonstrated that a homogeneous nanograting having the groove period much smaller than the laser wavelength (∼800 nm) can be fabricated on metals in air through ablation induced by interfering femtosecond laser pulses (100 fs at a repetition rate of 10 Hz). Morphological changes on stainless steel and Ti surfaces, observed with an increase in superimposed shots of the laser pulses at a low fluence, have shown that the nanograting is developed through bonding structure change at the interference fringes, plasmonic near-field ablation to create parallel grooves on the fringe, and subsequent excitation of surface plasmon polaritons to regulate the groove intervals at 1/3 or 1/4 of the fringe period over the whole irradiated area. Calculation for a model target having a thin oxide layer on the metal substrate reproduces well the observed groove periods and explains the mechanism for the nanograting formation.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-08-17
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 7


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