• Hyeong-Ryeol Park (박형렬)

  • Assistant Professor
  • Nano-fabrication and Optical spectroscopy
  • Current Research Interests

    Mid-infrared to terahertz spectrum, ranging from 5 µm to 5 mm in wavelength, is the focus of basic research in solid-state physics, chemistry, materials science, as well as applications in next-generation communications, homeland security, biosensing, and medical imaging. This frequency range is at the intersection between photonics and electronics, presenting tremendous opportunities to probe and harness fundamental light-matter interactions. The emerging fields of plasmonics and metamaterials have shown new possibilities to boost such light-matter interactions using engineered nanostructures. To overcome the dimension mismatch between the long-wavelength radiations and the nanostructures, new lithography techniques that fabricate an array of metal gaps of nanometer-to-Ångstrom scale have been recently developed. These next-generation nanostructures will have a great impact on the advancement of field enhancement and confinement toward the next level of applications as the following:

    • THz/Mid-IR absorption spectroscopy for sensing
      – Ultra-sensitive detection and fingerprinting of biomolecules in aqueous solutions
      – THz/Mid-IR imaging and spectroscopy for medical and pharmaceutical applications
      – Detection of ultra-small quantity of explosive materials with functional nanostructures
    • Ultrafast optical spectroscopy for 2D materials, magneto-optical photonic crystals, and superconductors in a broadband spectrum range.
      – Enhanced critical temperature of superconductors combined with nanogap structures.
      – Magneto-Plasmonics based on magneto-optical photonic crystals
      – Ultra-sensitive Infrared detector at room temperature
  • Biographical Sketch
    • B.S. in Physics (2006), Seoul National University, Seoul, Korea
    • Ph.D. in Physics (2012), Seoul National University, Seoul, Korea
      – “Strong coupling between terahertz nano-slot antenna and metallic nano-objects”
      – Advisor: Prof. Dai-Sik Kim
    • Postdoctoral research associate, Seoul National University, Seoul, Korea (2012-2013)
    • Postdoctoral research associate, University of Minnesota, MN, USA (2013-2016)
    • Assistant Professor, Department of Physics, Chungbuk National University (2016 – 2019)
    • Assistant Professor, Department of Physics, UNIST (2019 – present)
  • Selected Publications
    • Large area metal gaps and their optical applications, Advanced Optical Materials (2019) 7, 1800426
    • Perfect extinction of terahertz waves in monolayer graphene over 2-nm-wide metallic apertures, Advanced Optical Materials (2015) 3, 667
    • Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves, Nature Communications (2013) 4, 2361
    • Colossal absorption of molecules inside single terahertz nanoantennas, Nano Letters (2013) 13, 1782
    • Controlling terahertz radiation with nanoscale metal barriers embedded in nano slot antennas, ACS Nano (2011) 5, 8340