New horizons of nano-spectroscopy and -imaging
일 시 : 2022년 03월 23일 수요일 16:30
연 사 : 박 경 덕 교수 (포항공과대학교 물리학과)
장 소 : 온라인 (https://us02web.zoom.us/j/84923147523, 회의 ID: 849 2314 7523)
HOST : 정 문 석 교수님
초 록
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 “tip-enhanced cavity-spectroscopy (TECS)” overcoming the limitations of previous approaches to induce, probe, and dynamically control ultrastrong light-matter interactions in the quantum tunneling regime [3, 4]. Furthermore, I provide several new directions of nano-spectroscopy and -imaging, which have not 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 [5, 6]. Second, we dynamically control the near-field polarization by adopting adaptive optics technique to near-field optics [7]. Third, we develop conductive TECS to modify 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 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] Lee, H. and Koo, Y. et al., Science Advances 8, eabm5236 (2022).
[5] Koo, Y. et al., Advanced Materials 33, 2008234 (2021).
[6] Lee, H. et al., ACS Nano 15, 9057 (2021).
[7] Lee, D. Y. et al., Nature Communications 12, 3465 (2021).