Open AccessFemtosecond pump-probe technique assisted by surface plasmon resonance
Author(s) -
Yun-Ze Long,
Jian Zhang,
Guoping Wang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.7722
Subject(s) - materials science , femtosecond , excited state , surface plasmon resonance , resonance (particle physics) , surface plasmon , optics , atomic physics , ultrashort pulse , metal , beam (structure) , electron , plasmon , molecular physics , laser , optoelectronics , physics , nanoparticle , nanotechnology , quantum mechanics , metallurgy
Femtosecond pump-probe technique assisted by surface plasmon resonance SPR is investigated numerically in this paper. Our calculations show that the signal ratio ΔR/R is increased by 2—3 orders of magnitude higher than the standard pump-probe technique where ΔR and R are the intensity change and total intensity of the probe beam respectively. It should also be pointed out that ΔR/R is sensitive to the incident angle of the pump beam and the thickness of the metal film. In particular for the metal-absorbing material system ΔR induced by the hot electrons in the metal is only 2 percent of that induced by excited absorbing material so ΔR/R is mainly related to the dynamics of the absorbing material. This technique will be interesting in investigating the ultrafast surface dynamics of thin films.