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IBS-CMSD Colloquium_Dr. Jong Min Lim(Mar. 21)

작성자 : Center for Molecular Spectroscopy and Dynamics 등록일 : 2017-03-15 조회수:4294

 

 

          IBS Center for Molecular Spectroscopy and Dynamics

 

 

COLLOQUIUM

 

 

 

 

 

 

        SPEAKER

Dr. Jong Min Lim (IBS Center for Molecular Spectroscopy and Dynamics, Korea University)

        TITLE

Sub-10 fs Time-resolved Vibronic Optical Microscopy

        ABSTRACT

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.

 

        DATE AND VENUE

March 21, 2017 (Tuesday, 5:00-6:00 p.m.)

Seminar Room 116, KU R&D Center

 

        Language

Korean