• Dai Sik Kim (김대식)

  • Distinguished Professor
  • Nano Optics
  • Current Research Interests

    Optical phenomena at quantum scale
    At nanometer and subnanometer-Ångstrom scale, even the most fundament concepts of optics such as the index of refraction may well lose its precise definition. Here, the tail of quantum mechanical wave functions which penetrates into the vacuum with an Ångstrom length scale would create an effective index of refraction distinct from its bulk counterpart n=1:

    1. What is the index of refraction of a sub-nanometer dielectric barrier through which electrons are tunneling?;
    2. What is the smallest gap width that is physically meaningful?;
    3. Is there any potential applications resulting from these quantum interfaces?

    Long-wavelength nano devices

    Nano electronics can be thought of as being governed by the Maxwell’s equations operating at ultra-long wavelengths; low frequencies and at an extreme near-field. Common electronics concept therefore can, in principle, be re-derived from Maxwell’s equation at long wavelengths. For instance an elementary RLC circuit driven at 1 kHz can be thought of as an extreme,3×10-7 subwavelength phenomena on a length scale of 10 cm against a wavelength of 300 km. If we focus onto the capacitor gap of, say, 1 um, we are dealing with a 3×10-12 phonemonon. Terehertz nanotechnology therefore is a long-wavelength endeavor applied to the frequency range of 1012 Hz with real world potentials.

    Real world applications

    Yours-truly is interested in applying yours-truly’s diverse knowledge and experiences to solving real world problems and to innovating for the benefits of humankind. At present, defect finding and failure analysis for the semiconductor industries; cellular phone based applications, and extreme ultraviolet optics are appealing to the yours-truly’s magnitude of mind.

    His research interests of past and present include

    • Femtosecond spectroscopy of semiconductors (1986 – 2001 )
    • Surface plasmon photonics and near field microscopy (2000 – )
    • Terahertz nano technology (2007 – )
    • Single molecule biophysics (2003 – 2007)
    • Coherent acoustic and optical phonons (1996-2002)
  • Biographical Sketch
    • B.S. in Physics (1985), Seoul National University, Seoul, Korea
    • M.A. in Biophysics (1986), University of California, Berkeley, CA, USA
    • Ph.D. in Physics (1990), University of California, Berkeley
      “Subpicosecond Raman scattering studies of GaAs, In0.53Ga0.47As, and GaAs/AlAs multiple quantum wells”; Advisor: Prof. Peter Y. Yu
    • Postdoctoral research associate (1990) at Oklahoma State Universty, Stillwater;
      Advisor: Prof. J. J. Song
    • Postdoctoral research associate (1991-1993) at AT&T Bell Laboratories, Holmdel;
      Advisor: Dr. Jagdeep Shah
    • Postdoctoral research associate (1993-1994) at Oklahoma State Universty, Stillwater;
      Advisor: Prof. J. J. Song
    • Assistant professor (1994-1998), Department of Physics, Seoul National University
    • Associate professor (1998-2004), Department of Physics, Seoul National University
    • Professor (2004-2019), Department of Physics and Astronomy, Seoul National University
    • Distinguished Professor (2019- ), Ulsan National Institute of Science and Technology

    Awards etc.

    • Member, Korean academy of science and technology, 2016 (한림원정회원)
    • American Physical Society Fellow, 2011
      “For important contributions to ultrafast optical processes in semiconductors and near-field studies of plasmonics”
    • Optical Society of America Fellow
      “For contributions to ultrafast studies of semiconductors, plasmonicsand near-field optics”
    • Korea Science Award, 2013 (한국과학상)
    • Korea young scientist award, 2003 (젊은과학자상)
    • Human Rights Award (국제인권상), 2001 by NOCIRC, “For courageously fighting for the genital integrity of Korean boys”
  • Selected Publications
    1. D. S. Kim and P. Y. Yu, “Phonon Temperature Overshoot in GaAs Excited by Subpicosecond Laser Pulses”, Physical Review Letters 64, 946 (Feb. 1990).
    2. D. S. Kim, J. Shah, T. C. Damen, W. Schäfer, F. Jahnke, S. Schmitt-Rink, K. Köhler, “Unusually Slow Temporal Evolution of Femtosecond 4-Wave-Mixing Signals in Intrinsic GaAs Quantum-Wells-Direct Evidence for the Dominance of Interaction Effects”, Physical Review Letters69, 2725 (Nov. 1992).
    3. K. G. Lee, H. W. Kihm, J. E. Kihm, W. J. Choi, H. Kim, C. Ropers, D. J. Park, Y. C. Yoon, S. B. Choi, D. H. Woo, J. Kim, B. Lee, Q. H. Park, C. Lienau and D. S. Kim, “Vector field microscopic imaging of light”, K, Nature Photonics 1, 53 (2007) (Jan. 2007).
    4. M. A. Seo, H. R. Park, S. M. Koo, D. J. Park, J. H. Kang, O. K. Suwal, S. S. Choi, P. C. M. Planken, G. S. Park, N. K. Park, Q. H. Park, and D. S. Kim,“Terahertz Field Enhancement by a Metallic Nano Slit Operating Beyond the Skin-depth Limit”, Nature Photonics 3, 152 (Feb. 2009).
    5. H. R. Park, K. J. Ahn, S. H. Han, Y. M. Bahk, N. K. Park, and D. S. Kim, “Colossal absorption of molecules inside single terahertz nanoantennas”, Nano Letters 13, 4 (Feb. 2013).
    6. T. H. Kang, R.H. J. Y. Kim, G. C. Choi, J. U. Lee, H. W. Park, H. T. Jeon, C. H. Park &D. S. Kim, “Terahertz rectification in ring-shaped quantum barriers”, Nat. Commun. (2018).