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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)


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

Representative Research Papers

  • Electron heating and thermal relaxation of gold nanorods revealed by two-dimensional electronic spectroscopy
    Lietard A., Hsieh C.-S., Rhee H., Cho M.,
    Nature Communications, 2018, 9 (1), doi:10.1038/s41467-018-03002-8
  • Correlation between excited d-orbital electron lifetime in polaron dynamics and coloration of WO 3 upon ultraviolet exposure
    Lee Y.-A., Han S.-I., Rhee H., Seo H.,
    Applied Surface Science, 2018, 440 (1), pp 1244-1251, doi:10.1016/j.apsusc.2018.01.157
  • Selective Suppression of Stimulated Raman Scattering with Another Competing Stimulated Raman Scattering
    Doyeon Kim, Dae Sik Choi, Jiwoong Kwon, Sang Hee Shim, Hanju Rhee, Minhaeng Cho
    J. Phys. Chem. Lett., 2017, 8 (24), pp 6118–6123 doi: 10.1021/acs.jpclett.7b02752
  • Origin of the Reversible Thermochromic Properties of Polydiacetylenes Revealed by Ultrafast Spectroscopy
    Junwoo Baek, Joonyoung F. Joung, Songyi Lee, Hanju Rhee, Myung Hwa Kim, Sungnam Park, and Juyoung Yoon
    J. Phys. Chem. Lett., 2016, 7 (2), pp 259–265, doi: 10.1021/acs.jpclett.5b02671
  • Multi-Functional Transparent Luminescent Configuration for Advanced Photovoltaics
    Minwoo Nam, Hyun-Keun Kwon, S. Joon Kwon, Soon-Hong Kwon, Minjeong Cha, Sung-Hwan Lee, Sangpil Park, Dawoon Jeong, Kyu-Tae Lee, Hanju Rhee, Young Rag Do, Sangin Kim, Kyoungsik Kim, Richard H. Friend, Joon Soo Han, Il Ki Han, Doo-Hyun Ko
    Advanced Energy Materials vol. 6, 150204 (2016), doi: 10.1002/aenm.201502404
  • Water Hydrogen-Bonding Network Structure and Dynamics at Phospholipid Multibilayer Surface: Femtosecond Mid-IR Pump–Probe Spectroscopy
    Achintya Kundu, Bartosz Błasiak, Joon-Hyung Lim, Kyungwon Kwak, and Minhaeng Cho
    J. Phys. Chem. Lett., 2016, 7 (5), pp 741–745, doi: 10.1021/acs.jpclett.6b00022
  • Water Dynamics in Cytoplasm-Like Crowded Environment Correlates with the Conformational Transition of the Macromolecular Crowder
    Pramod Kumar Verma, Achintya Kundu, Jeong-Hyon Ha, and Minhaeng Cho
    J. Am. Chem. Soc., 2016, 138 (49), pp 16081–16088, doi: 10.1021/jacs.6b10164
  • Quantum Beats and Phase Shifts in Two-Dimensional Electronic Spectra of Zinc Naphthalocyanine Monomer and Aggregate
    Ki-Hee Song, Munui Gu, Min-Seok Kim, Hyeok-Jun Kwon, Hanju Rhee, Hogyu Han, and Minhaeng Cho
    J. Phys. Chem. Lett., 2015, 6 (21), pp 4314–4318, doi: 10.1021/acs.jpclett.5b02030
  • Single-Shot Electronic Optical Activity Interferometry: Power and Phase Fluctuation-Free Measurement
    Intae Eom, Sung-Hyun Ahn, Hanju Rhee, and Minhaeng Cho
    Physical Review Letters vol. 108, 1013901 (2012), doi: 10.1103/PhysRevLett.108.103901
  • Coherent electric field characterization of molecular chirality in the time domain
    Hanju Rhee, Intae Eom, Sung-Hyun Ahna and Minhaeng Cho
    Chemical Society Reviews Issue 12, 4381-4584 (2012), doi: 10.1039/c2cs15336j