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Title: Investigation of the nonlocal nonlinear optical response of copper nanostructured thin films prepared by pulsed laser deposition

Nanostructured copper thin films have been prepared using the pulsed laser deposition method. Optical absorption spectra of these films exhibit plasmonic absorption peaks around 619 nm, which suggests the formation of copper nanoparticles on their surfaces. Scanning electron micrographs of the films confirm the nanoparticle formation on the films surfaces. After laser beam passing through the thin films, the observed diffraction rings on a far-field screen have been recorded. Despite the smallness of the maximal axial phase shifts of the films, which have been obtained using the nonlocal z-scan theory, a series of low-intensity rings can be observed on the far field screen for some specific positions of the thin films from the focal point. It is shown that the best approach to determining the sign and magnitude of the nonlinear refractive index of thin samples is the application of the conventional closeaperture z-scan method. (nanostructures)
Authors:
; ;  [1]
  1. Laser and Optics Research School, P.O. Box 14155-1339, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22373334
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTRA; BEAMS; COPPER; DIFFRACTION; ELECTRON SCANNING; ENERGY BEAM DEPOSITION; LASER RADIATION; LASERS; NANOPARTICLES; NANOSTRUCTURES; NONLINEAR PROBLEMS; PHASE SHIFT; PLASMONS; PULSED IRRADIATION; REFRACTIVE INDEX; THIN FILMS