Brief Communication

Journal of Nanoparticle Research

, Volume 11, Issue 4, pp 989-993

Free-carrier absorption and optical limiting in the suspensions of CuS and Cu2O hollow spheres

  • Quanshui LiAffiliated withDepartment of Physics & State Key Laboratory for Mesoscopic Physics, Peking University
  • , Chunling LiuAffiliated withDepartment of Physics & State Key Laboratory for Mesoscopic Physics, Peking University Email author 
  • , Qihuang GongAffiliated withDepartment of Physics & State Key Laboratory for Mesoscopic Physics, Peking University Email author 
  • , Jining GaoAffiliated withBeijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University
  • , Limin QiAffiliated withBeijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University

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Abstract

In order to reveal the optical limiting mechanisms of semiconductor hollow spheres, the nonlinear optical properties of CuS and Cu2O hollow spheres were investigated via the fluence-dependent transmittance and the nonlinear scattering measurements. The CuS and Cu2O hollow spheres have similar morphologies and different types of optical band-gap. The experimental results show that the optical limiting performance of CuS is better than that of Cu2O, although the nonlinear scattering of Cu2O is stronger than that of CuS. Free-carrier absorption based on the delocalized carriers (holes) in CuS is believed to play an important role in the optical limiting effects. The merits of the structure of semiconductor hollow spheres used for optical limiting were discussed.

Keywords

Hollow spheres Nonlinear optical properties Nonlinear scattering Free-carrier absorption Nanoscale shells