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Title: Nanosecond and ultrafast optical power limiting in luminescent Fe{sub 2}O{sub 3} hexagonal nanomorphotype

Nonlinear optical absorption and optical power limiting properties of Fe{sub 2}O{sub 3} hexagonal nanomorphotype are investigated using open aperture Z-scan technique with the 5 ns and 100 fs laser pulses, at 532 nm and 800 nm excitation domains. At relatively low pulse energies (below 5 μJ), sample shows saturable absorption (SA), but on going to the higher energies an interesting switchover from saturable absorption to effective two photon absorption is observed in both excitation domains. The magnitude of effective two photon absorption coefficients is calculated to be in the range of 10{sup −10} m/W for nanosecond and 10{sup −15} m/W for femtosecond laser pulse energies, respectively. XRD and TEM study reveals the polycrystalline nature, hexagonal morphology, and size of the nanostructure. The luminescence emission property is examined by photoluminescence spectroscopy (PL). It is found that some strange features exist in the luminescence spectra that are consistent with the nanoparticles size distribution. The PL emission lines are explained as originated from various optical band edges due to the size induced quantum confinement and band gap resonant PL absorption/emission behavior of semiconductor nanostructures.
Authors:
;  [1] ;  [2]
  1. Department of Physics, St. Berchmans College, Changanassery 686101 (India)
  2. Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)
Publication Date:
OSTI Identifier:
22413031
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; ABSORPTION SPECTROSCOPY; EMISSION SPECTRA; EMISSION SPECTROSCOPY; EXCITATION; FERRITES; IRON OXIDES; MORPHOLOGY; NANOPARTICLES; NANOSTRUCTURES; NONLINEAR PROBLEMS; PHOTOLUMINESCENCE; PHOTONS; POLYCRYSTALS; SEMICONDUCTOR MATERIALS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION