Enhanced Ultrafast Nonlinear Optical Response in Ferrite Core/Shell Nanostructures with Excellent Optical Limiting Performance
Perumbilavil, Sreekanth (Tampere University of Technology)
López-Ortega, Alberto (CIC nanoGUNE)
Tiwari, Gaurav Kumar (Raman Research Institute)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
Endo, Tamio (Sagamihara Surface Laboratory)
Philip, Reji (Raman Research Institute)

Fecha:	2018
Resumen:	Nonlinear optical nanostructured materials are gaining increased interest as optical limiters for various applications, although many of them suffer from reduced efficiencies at high-light fluences due to photoinduced deterioration. The nonlinear optical properties of ferrite core/shell nanoparticles showing their robustness for ultrafast optical limiting applications are reported. At 100 fs ultrashort laser pulses the effective two-photon absorption (2PA) coefficient shows a nonmonotonic dependence on the shell thickness, with a maximum value obtained for thin shells. In view of the local electric field confinement, this indicates that core/shell is an advantageous morphology to improve the nonlinear optical parameters, exhibiting excellent optical limiting performance with effective 2PA coefficients in the range of 10 cm W (100 fs excitation), and optical limiting threshold fluences in the range of 1. 7 J cm. These values are comparable to or better than most of the recently reported optical limiting materials. The quality of the open aperture Z-scan data recorded from repeat measurements at intensities as high as 35 TW cm, indicates their considerably high optical damage thresholds in a toluene dispersion, ensuring their robustness in practical applications. Thus, the high photostability combined with the remarkable nonlinear optical properties makes these nanoparticles excellent candidates for ultrafast optical limiting applications.
Ayudas:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015 Ministerio de Economía y Competitividad IJCI-2014-21530 Ministerio de Economía y Competitividad SEV-2013-0295
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Core/shell nanoparticles ; Nonlinear absorption ; Optical limiting ; Oxide heterostructures
Publicado en:	Small, Vol. 14, Issue 6 (February 2018) , art. 1701001, ISSN 1613-6829

DOI: 10.1002/smll.201701001

Preprint 34 p, 2.1 MB

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