Sub-10 fs Time-Resolved Vibronic Optical Microscopy
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- 作者：Christoph Schnedermann ; Jong Min Lim ; Torsten Wende ; Alex S. Duarte ; Limeng Ni ; Qifei Gu ; Aditya Sadhanala ; Akshay Rao ; Philipp Kukura
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2016
- 出版时间：December 1, 2016
- 年：2016
- 卷：7
- 期：23
- 页码：4854-4859
- 全文大小：522K
- ISSN：1948-7185
文摘
We introduce femtosecond wide-field transient absorption microscopy combining sub-10 fs pump and probe pulses covering the complete visible (500–650 nm) and near-infrared (650–950 nm) spectrum with diffraction-limited optical resolution. We demonstrate the capabilities of our system by reporting the spatially- and spectrally-resolved transient electronic response of MAPbI3–xClx perovskite films and reveal significant quenching of the transient bleach signal at grain boundaries. The unprecedented temporal resolution enables us to directly observe the formation of band-gap renormalization, completed in 25 fs after photoexcitation. In addition, we acquire hyperspectral Raman maps of TIPS pentacene films with sub-400 nm spatial and sub-15 cm–1 spectral resolution covering the 100–2000 cm–1 window. Our approach opens up the possibility of studying ultrafast dynamics on nanometer length and femtosecond time scales in a variety of two-dimensional and nanoscopic systems.