|Author||Miyazaki, Kenzo ♦ Miyaji, Godai ♦ Inoue, Toshishige|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|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.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Applied Physics Letters|
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