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Title: Nonlinear optical absorption tuning in Bi{sub 3.15}Nd{sub 0.85}Ti{sub 3}O{sub 12} ferroelectric thin films by thickness

The tunability of nonlinear optical (NLO) absorption in Bi{sub 3.15}Nd{sub 0.85}Ti{sub 3}O{sub 12} (BNT) ferroelectric thin films was investigated through the open aperture Z-scan method with femtosecond laser pulses at the wavelength of 800 nm. NLO absorption responses of the BNT films were observed to be highly sensitive to the film thickness. As the film thickness increases from 106.8 to 139.7 nm, the NLO absorption changes from saturable absorption (SA) to reverse saturable absorption (RSA). When the film thickness further increases to 312.9 nm, the RSA effect is enhanced. A band-gap-related competition between the ground-state excitation and the two-photon absorption is responsible for the absorption switching behavior. Such a tunable NLO absorption can widen the photonic application of the BNT thin films.
Authors:
; ; ; ; ; ;  [1] ;  [2] ; ;  [3]
  1. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Materials Science and Engineering, Xiangtan University, Hunan, Xiangtan 411105 (China)
  2. (China)
  3. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Shanxi, Xi'an 710119 (China)
Publication Date:
OSTI Identifier:
22398864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 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; ABSORPTION; APERTURES; BISMUTH COMPOUNDS; ELECTRONIC STRUCTURE; ENERGY GAP; EXCITATION; FERROELECTRIC MATERIALS; GROUND STATES; LASER RADIATION; NEODYMIUM COMPOUNDS; NONLINEAR PROBLEMS; PHOTONS; PULSED IRRADIATION; THIN FILMS; TITANIUM OXIDES; WAVELENGTHS