通过光Kerr效应研究了PbS半导体纳米颗粒的三阶光学非线性响应。在较低的激发强度下,单激子态的饱和吸收和双激子效应的激发态吸收对非线性的贡献同时存在;而在高激发强度下,双激子效应是主要的。计算了高激发强度下(4 m J/cm2)PbS半导...通过光Kerr效应研究了PbS半导体纳米颗粒的三阶光学非线性响应。在较低的激发强度下,单激子态的饱和吸收和双激子效应的激发态吸收对非线性的贡献同时存在;而在高激发强度下,双激子效应是主要的。计算了高激发强度下(4 m J/cm2)PbS半导体纳米颗粒的三阶非线性光学极化率为5.1×10-10esu。展开更多
PbS nanoparticles modified by a polymer (P-PbS) was prepared,and the transient nonlinear optical properties studied by femtosecond optical Kerr effect(OKE) spectroscopy for the first time.A very large nonlinear optica...PbS nanoparticles modified by a polymer (P-PbS) was prepared,and the transient nonlinear optical properties studied by femtosecond optical Kerr effect(OKE) spectroscopy for the first time.A very large nonlinear optical effect(X^(3)-5.6×10^-12esu) with response time comparable to the laser pulse(-165fs) was observed.Comparing with PbS nonoparticles stabilized with PVA and coated with sodium dodecyle benzene sulphonate(DBS).the optical nonlinearity of the PbS nanoparticles modified by the polymer is much larger than those of them.Thereafter.the corresponding nonlinearity mechanism was interpreted.展开更多
文摘通过光Kerr效应研究了PbS半导体纳米颗粒的三阶光学非线性响应。在较低的激发强度下,单激子态的饱和吸收和双激子效应的激发态吸收对非线性的贡献同时存在;而在高激发强度下,双激子效应是主要的。计算了高激发强度下(4 m J/cm2)PbS半导体纳米颗粒的三阶非线性光学极化率为5.1×10-10esu。
文摘PbS nanoparticles modified by a polymer (P-PbS) was prepared,and the transient nonlinear optical properties studied by femtosecond optical Kerr effect(OKE) spectroscopy for the first time.A very large nonlinear optical effect(X^(3)-5.6×10^-12esu) with response time comparable to the laser pulse(-165fs) was observed.Comparing with PbS nonoparticles stabilized with PVA and coated with sodium dodecyle benzene sulphonate(DBS).the optical nonlinearity of the PbS nanoparticles modified by the polymer is much larger than those of them.Thereafter.the corresponding nonlinearity mechanism was interpreted.
