Colloquium

  • New horizons of nano-spectroscopy and -imaging

  • Speaker : Prof. Kyoung-Duck Park 박경덕 교수
    Affiliation : Department of Physics, UNIST 울산과학기술원 물리학과
    Date : December 1, 2021 4:00 PM
    Place : Zoom (https://unist-kr.zoom.us/j/84777273337)
    Contact : diani@unist.ac.kr (Yejin Hwang, Academic & Student Affairs Team)
    Host : Prof. Seon Namgung 남궁 선 교수 (seon@unist.ac.kr)
  • Abstract

  • Structure, functions, dynamics, and interactions are the basic properties to systematically understand physical systems existing in nature. In particular, there have been many scientific adventures to understand light-matter interactions, yet in the classical regime at the microscale due to the diffraction-limited optical resolution. Recently, plasmonic nano-cavity enables to induce light-matter interactions and tip-enhanced nano-spectroscopy enables to probe them at the nanoscale [1, 2]. However, these two approaches have developed independently with their own weaknesses so far. In this talk, I provide a novel concept of “quantum-tunneling tip-enhanced cavity-spectroscopy (q-TECS)” overcoming the limitations of previous approaches to induce, probe, and dynamically control ultrastrong light-matter interactions in the quantum tunneling regime [3]. Furthermore, I provide several new directions of nano-spectroscopy and -imaging, which haven’t been thought in the near-field optics community before. First, we exploit extremely high tip-pressure (~GPa scale) to directly modify the lattice structure and electronic properties of materials [4, 5]. Second, we dynamically control the near-field polarization by adopting adaptive optics technique to near-field optics [6]. Third, we develop conductive TECS to modify the electrical properties of materials by directly flowing an electric current through the cavity junction. In addition, in the last part of this talk, I present specific research directions of our group in the fields of cavity quantum optics, plexciton condensate, quantum molecular physics, and quantum nonlinear optics, which can be enabled through the q-TECS approach.

     

    1] Park, K.-D. et al., Nature Nanotechnology 13, 59 (2018).

    [2] Park, K.-D. et al., Science Advances 5, eaav5931 (2019).

    [3] Lee, H. et al., Advanced Functional Materials 31, 2102893 (2021).

    [4] Koo, Y. et al., Advanced Materials 33, 2008234 (2021).

    [5] Lee, H. et al., ACS Nano 15, 9057 (2021).

    [6] Lee, D. Y. et al., Nature Communications 12, 3465 (2021).