期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 18, 期 1, 页码 329-339出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2011.2125782
关键词
Femtobiology; few-optical-cycle light pulses; optical parametric amplifiers; ultrafast spectroscopy
资金
- PRIN Project JKBBK4 Tracking ultrafast photoinduced intra- and inter-molecular processes in natural and artificial photosensors.
- HFSP [RGP0005]
- Politecnico di Milano
Many (bio) molecules, following light absorption, undergo ultrafast nonradiative decay processes, taking place over timescales of tens to hundreds of femtoseconds. Ultrafast optical spectroscopy allows tracking in real time this energy flow using broadly tunable few-optical-cycle light pulses. Optical parametric amplifiers, thanks to their broad and tunable gain bandwidths, are powerful tools for the generation of such pulses. This paper first reviews our work on broadband optical parametric amplifiers, which led to the demonstration of few-optical-cycle sub-10-fs pulses continuously tunable from the visible (500 nm) to the near-IR (2 mu m). We then present selected examples of applications to ultrafast spectroscopy of molecules, such as isomerization of rhodopsin, carotenoid-bacteriochlorophyll energy transfer in light-harvesting complexes, and polymer-fullerene electron transfer in blends for organic photovoltaics.
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