Structuring by field enhancement of glass, Ag, Au, and Co thin films using short pulse laser ablation

Journal Article · Tue Dec 01 00:00:00 EST 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3264833· OSTI ID:21359389

Ulmeanu, M; Zamfirescu, M; Rusen, L; Luculescu, C; Moldovan, A; Stratan, A; Dabu, R ^[1]

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1. Department of Laser, National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele (Romania)

Single pulse laser ablation of glass, Ag, Au, and Co thin films was experimentally investigated with a laser pulse width of 400 ps at a wavelength of 532 nm both in the far and near fields. In the far-field regime, the electromagnetic field results from a focused laser beam, while the near-field regime is realized by a combination of the focused laser beam incident on a spherical colloidal particle. For the near-field experiments we have used polystyrene colloidal particles of 700 nm diameter self-assembled or spin coated on top of the surfaces. Laser fluences applied are in the range of 0.01-10 J/cm{sup 2}. The diameter and the morphologies of the ablated holes were investigated by optical microscopy, profilometry, scanning electron microscopy, and atomic force microscopy. The dependence of the shape of the holes reflects the fluence regime and the thermophysical properties, i.e., melting temperature and thermal diffusivity of the surfaces involved in the experiments. We give quantitative data about the fluence threshold, diameter, and depth ablation dependence for the far and near fields and discuss their values with respect to the enhancement factor of the intensity of the electromagnetic field due to the use of the colloidal particles. Theoretical estimations of the intensity enhancement were done using the finite-difference time-domain method by using the RSOFT software. The application of near fields allows structuring of the surfaces with structure dimension in the order of 100 nm and even below.

• OSTI ID: 21359389
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 11; Other Information: DOI: 10.1063/1.3264833; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABLATION
ATOMIC FORCE MICROSCOPY
COBALT
COMPUTER CODES
ELECTROMAGNETIC FIELDS
GLASS
GOLD
HOLES
MELTING
MELTING POINTS
MORPHOLOGY
NANOSTRUCTURES
OPTICAL MICROSCOPY
POLYSTYRENE
SCANNING ELECTRON MICROSCOPY
SILICON COMPOUNDS
SILVER
SPHERICAL CONFIGURATION
THERMAL DIFFUSIVITY
THIN FILMS
CONFIGURATION
ELECTRON MICROSCOPY
ELEMENTS
FILMS
MATERIALS
METALS
MICROSCOPY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
SYNTHETIC MATERIALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE