Femtosecond Multidimensional Laser Spectroscopic System
Femtosecond Multidimensional Laser Spectroscopic System Leading-edge Equipment Home
The FMLS in Seoul Center can observe fast molecular events on a femtosecond time scale, and it is being used for investigating ultrafast photochemical reaction dynamics of a variety of molecular systems and nanomaterials in chemistry, biology, and material sciences.
Characteristics of the Equipment
- 2-D vibrational and electronic spectroscopy in the infrared and visible frequency ranges (nanoparticles, photosynthetic systems, etc.)
- Pump-probe transient absorption spectroscopy of molecular systems and materials (metal nanostructures, semiconductor nanoparticles, etc.)
- Coherent Raman spectroscopy utilizing nonlinear optical effects (SRS, CARS)
Representative Research Case
Selective suppression of stimulated Raman scattering using three-color multiple laser beams
Three-color stimulated Raman scattering (SRS) spectroscopy was developed. It allows selective suppression of a particular stimulated Raman scattering with another competing SRS. It is anticipated that the novel technique would be of critical use in developing a super-resolution Raman imaging microscope in the near future.
Three-color SRS spectroscopy (upper) and SRS suppression efficiency as a function of depletion beam intensity (lower)
- Femtosecond time-resolved transient absorption signals of WO3, pristine, and FTO
- Chiral SFG spectroscopy and fast polarization switching CD measurement systems