Ultrafast optical processes in new Cu-Fe-S nanoparticles

Alexander M. Malyarevich; N. N. Posnov; I. A. Denissov; Konstantin V. Yumashev; Victor P. Mikhailov; Valerij S. Gurin

doi:10.1117/12.341454

5 March 1999 Ultrafast optical processes in new Cu-Fe-S nanoparticles

Alexander M. Malyarevich, N. N. Posnov, I. A. Denissov, Konstantin V. Yumashev, Victor P. Mikhailov, Valerij S. Gurin

Proceedings Volume 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics; (1999) https://doi.org/10.1117/12.341454
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

Abstract

Nonlinear optical effects in surface oxidized CuFe_xS_y (x equals 1,2, y equals 2,3) nanoparticles incorporated in polymeric film are studied. Surface oxidation of CuFeS₂ and CuFe₂S₃ nanoparticles results in appearance of the additional absorption band with maximum at 1.03 and 1.15 micrometer, respectively. Bleaching of this additional absorption band in CuFe₂S₃ particles and the induced absorption in all studied samples after picosecond laser excitation take place. An energy level scheme for CuFeS₂ and CuFe₂S₃ nanoparticles with long-lived trap levels in the band gap is proposed and origin of additional absorption is discussed. Characteristic times for career relaxation from conduction band to these trap levels are approximately 25 plus or minus 5 ps for CuFe₂S₃ and approximately 70 plus or minus 10 ps for CuFeS₂ oxidized nanoparticles. The relaxation of electrons from trap levels has characteristic time of more than 500 ps.

Citation Download Citation

Alexander M. Malyarevich, N. N. Posnov, I. A. Denissov, Konstantin V. Yumashev, Victor P. Mikhailov, and Valerij S. Gurin "Ultrafast optical processes in new Cu-Fe-S nanoparticles", Proc. SPIE 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics, (5 March 1999); https://doi.org/10.1117/12.341454

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