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Femtosecond Multidimensional Laser Spectroscopic System

Femtosecond Multidimensional Laser Spectroscopic System Leading-edge Equipment Home

Equipment Introduction

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)

Application

  • Femtosecond time-resolved transient absorption signals of WO3, pristine, and FTO
  • Chiral SFG spectroscopy and fast polarization switching CD measurement systems