Ultrafast Optical Response from a Novel Tri-Branched Copolymer |
| |
作者姓名: | 李波 米君 孟凡顺 田禾 钱士雄 |
| |
作者单位: | [1]DepartmentofPhysics,FudanUniversity,Shanghai200433 [2]InstituteofFineChemicals,EastChinaUniversityofScienceandTechnology,Shanghai200237 |
| |
摘 要: | A novel tri-branched copolymer is synthesized to show strong two-photon absorption and intense two-photon absorption induced fluorescence emission under the excitation of the femtosecond laser pulses at wavelength of 80Ohm. The dynamics of the excited state was measured by the pump-probe technique. In a one-colour pump-probe experiment at 800 nm, there was an ultrafast transient absorption, followed by other two relaxation processes. The two-photon absorption process could be one origin for this ultrafast photoabsorption signal, which was further proven by two-colour pump-probe experiments. The other two decaying processes in the transient absorption dynamics have lifetime of about 15ps and 129ps, which reflect the intraband vibrational relaxation and the decay of two-photon excited state, respectively.
|
关 键 词: | 双光子吸收 超快光响应 三分枝共聚物 绿色荧光发射 |
本文献已被 维普 等数据库收录! |
|