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Equipment Introduction

FMLS in Seoul Center, which can observe fast molecular events on a femtosecond time scale, 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

• 2D vibrational and electronic spectroscopy in the infrared and visible frequency ranges (nanoparticles, photosynthetic system, 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)
• Development of ultrafast chiroptical spectroscopy and imaging techniques

Representative Research Case

Development of femtosecond chiral SFG spectroscopic technique distinguishing between mirror-image structures of enantiomers

We developed a new chiral vibrational sum-frequency generation (SFG) spectroscopy using femtosecond infrared and visible lasers, which is capable of distinguishing between stereochemical structures (R-form/S-form) of enantiometers.

• Measured with the home-built femtosecond chiral vibrational SFG spectrometer
• Chiral vibrational SFG spectra of enantiomeric limonene molecules

Application

• Femtosecond time-resolved spectroscopy of nanomaterial sensor
• Development of nonlinear Raman spectroscopy for label-free super-resolution imaging

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