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Title: Ultrafast laser induced periodic sub-wavelength aluminum surface structures and nanoparticles in air and liquids

Abstract

In this communication, we demonstrate the generation of laser-induced periodic sub-wavelength surface structures (LIPSS) or ripples on a bulk aluminum (Al) and Al nanoparticles (NPs) by femtosecond (fs) laser direct writing technique. Laser irradiation was performed on Al surface at normal incidence in air and by immersing in ethanol (C₂H₅OH) and water (H₂O) using linearly polarized Ti:sapphire fs laser pulses of ~110 fs pulse duration and ~800 nm wavelength. Field emission scanning electron microscope is utilized for imaging surface morphology of laser written structures and it reveals that the spatial periodicity as well as the surface morphology of the LIPSS depends on the surrounding dielectric medium and also on the various laser irradiation parameters. The observed LIPSS have been classified as low spatial frequency LIPSS which are perpendicularly oriented to the laser polarization with a periodicity from 460 to 620 nm and high spatial frequency LIPSS which spectacles a periodicity less than 100 nm with the orientation parallel to the polarization of the incident laser beam. Fabricated colloidal solutions, which contain the Al NPs, were characterized by UV-Vis absorption spectroscopy and transmission electron microscopy (TEM). TEM results reveal the formation of internal cavities in Al NPs both in ethanol andmore » water. Formation mechanism of LIPSS and cavities inside the nanoparticles are discussed in detail.« less

Authors:
; ;  [1];  [2]
  1. School of Physics, University of Hyderabad, Hyderabad 500046 (India)
  2. Department of Physics and Center for Research in Photonics, University of Ottawa, 150 Louis Pasteur, Ottawa K1N6N5, Ontario (Canada)
Publication Date:
OSTI Identifier:
22305985
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; AIR; ALUMINIUM; BEAMS; DIELECTRIC MATERIALS; FIELD EMISSION; LASER RADIATION; LIQUIDS; NANOPARTICLES; ORIENTATION; PERIODICITY; POLARIZATION; SAPPHIRE; SCANNING ELECTRON MICROSCOPY; SURFACES; TRANSMISSION ELECTRON MICROSCOPY; WATER; WAVELENGTHS

Citation Formats

Kuladeep, Rajamudili, Dar, Mudasir H., Rao, D. Narayana, E-mail: dnrsp@uohyd.ac.in, E-mail: dnr-laserlab@yahoo.com, and Deepak, K. L. N. Ultrafast laser induced periodic sub-wavelength aluminum surface structures and nanoparticles in air and liquids. United States: N. p., 2014. Web. doi:10.1063/1.4896190.
Kuladeep, Rajamudili, Dar, Mudasir H., Rao, D. Narayana, E-mail: dnrsp@uohyd.ac.in, E-mail: dnr-laserlab@yahoo.com, & Deepak, K. L. N. Ultrafast laser induced periodic sub-wavelength aluminum surface structures and nanoparticles in air and liquids. United States. doi:10.1063/1.4896190.
Kuladeep, Rajamudili, Dar, Mudasir H., Rao, D. Narayana, E-mail: dnrsp@uohyd.ac.in, E-mail: dnr-laserlab@yahoo.com, and Deepak, K. L. N. Sun . "Ultrafast laser induced periodic sub-wavelength aluminum surface structures and nanoparticles in air and liquids". United States. doi:10.1063/1.4896190.
@article{osti_22305985,
title = {Ultrafast laser induced periodic sub-wavelength aluminum surface structures and nanoparticles in air and liquids},
author = {Kuladeep, Rajamudili and Dar, Mudasir H. and Rao, D. Narayana, E-mail: dnrsp@uohyd.ac.in, E-mail: dnr-laserlab@yahoo.com and Deepak, K. L. N.},
abstractNote = {In this communication, we demonstrate the generation of laser-induced periodic sub-wavelength surface structures (LIPSS) or ripples on a bulk aluminum (Al) and Al nanoparticles (NPs) by femtosecond (fs) laser direct writing technique. Laser irradiation was performed on Al surface at normal incidence in air and by immersing in ethanol (C₂H₅OH) and water (H₂O) using linearly polarized Ti:sapphire fs laser pulses of ~110 fs pulse duration and ~800 nm wavelength. Field emission scanning electron microscope is utilized for imaging surface morphology of laser written structures and it reveals that the spatial periodicity as well as the surface morphology of the LIPSS depends on the surrounding dielectric medium and also on the various laser irradiation parameters. The observed LIPSS have been classified as low spatial frequency LIPSS which are perpendicularly oriented to the laser polarization with a periodicity from 460 to 620 nm and high spatial frequency LIPSS which spectacles a periodicity less than 100 nm with the orientation parallel to the polarization of the incident laser beam. Fabricated colloidal solutions, which contain the Al NPs, were characterized by UV-Vis absorption spectroscopy and transmission electron microscopy (TEM). TEM results reveal the formation of internal cavities in Al NPs both in ethanol and water. Formation mechanism of LIPSS and cavities inside the nanoparticles are discussed in detail.},
doi = {10.1063/1.4896190},
journal = {Journal of Applied Physics},
number = 11,
volume = 116,
place = {United States},
year = {Sun Sep 21 00:00:00 EDT 2014},
month = {Sun Sep 21 00:00:00 EDT 2014}
}
  • Abstract not provided.
  • Ultrafast pump-probe microscopy has been used to investigate laser-induced periodic surface structure (LIPSS) formation on polished Si surfaces. A crater forms on the surface after irradiation by a 150 fs laser pulse, and a second, subsequent pulse forms LIPSS within the crater. Sequentially delayed images show that LIPSS with a periodicity slightly less than the fundamental laser wavelength of 780 nm appear on Si surfaces ∼50 ps after arrival of the second pump laser pulse, well after the onset of melting. LIPSS are observed on the same timescale as material removal, suggesting that their formation involves material ejection.
  • Laser-induced ripples or uniform arrays of continuous near sub-wavelength or discontinuous deep sub-wavelength structures are formed on single-crystalline silicon (Si) by femtosecond (fs) laser direct writing technique. Laser irradiation was performed on Si wafers at normal incidence in air and by immersing them in dimethyl sulfoxide using linearly polarized Ti:sapphire fs laser pulses of ∼110 fs pulse duration and ∼800 nm wavelength. Morphology studies of laser written surfaces reveal that sub-wavelength features are oriented perpendicular to laser polarization, while their morphology and spatial periodicity depend on the surrounding dielectric medium. The formation mechanism of the sub-wavelength features is explained by interferencemore » of incident laser with surface plasmon polaritons. This work proves the feasibility of fs laser direct writing technique for the fabrication of sub-wavelength features, which could help in fabrication of advanced electro-optic devices.« less
  • Abstract not provided.
  • In this article, we perform a theoretical study to understand morphological differences in femtosecond laser induced periodic surface structures on noble metals. Our numerical study thoroughly examines the role of two competing ultrafast processes, electron-phonon energy coupling and hot electron diffusion, following femtosecond laser heating of metals. The calculation results confirm our previous experimental work on femtosecond laser induced periodic surface structures on noble metals, where electron-phonon coupling strength is believed to play the dominant role.