A5077330048- Plasmonic and Surface Plasmon Research
- Thermal Radiation and Cooling Technologies
- Terahertz technology and applications
- Metamaterials and Metasurfaces Applications
- Optical Wireless Communication Technologies
- Transition Metal Oxide Nanomaterials
- Gold and Silver Nanoparticles Synthesis and Applications
Seoul National University
2018-2023
Ulsan National Institute of Science and Technology
2021-2023
Abstract With the advancements of nanotechnology, innovative photonic designs coupled with functional materials provide a unique way to acquire, share, and respond effectively information. It is found that simple deposition 30 nm‐thick palladium nanofilm on terahertz (THz) metasurface chip 14 nm‐wide effective nanogap asymmetric geometries allows tracking both interatomic interfacial gas–matter interactions, including gas adsorption, hydrogenation (or dehydrogenation), metal phase changes,...
Abstract Vanadium dioxide (VO 2 ) is one of the most promising materials for active metasurfaces due to insulator‐metal transition, urging development an etching‐free patterning method and realization multifunctionality in various spectral bands. Here, without etching, photolithography vanadium metal followed by thermal oxidation achieve all‐VO slit array that can be exploited as a multifunctional terahertz (THz) transparent electrode. The retain approximately constant THz transparency over...
Abstract Photo‐excited graphene has a positive (semiconductor‐like) or negative (metal‐like) response depending on the Fermi level, which is tuned by gate control, doping, and growth. Both photoconductive responses have potential application as an ultrafast optical modulator in control of light transmission. However, it challenging to achieve high on/off ratio photo‐excited because small absorption electromagnetic waves limitation photo‐induced conductivity change. Here, negative‐type...
Abstract Metallic nanostructures are combined with various active materials for electrical, optical, and thermal modulations of their optical properties. In particular, the modulation, deformation metallic at high temperatures limits applications to relatively low temperatures, where expansion metals is negligible. Here, a unique regime reported terahertz (THz) waves transmitting through 5 nm wide slot antennas can be significantly modulated via controlled without materials. The normalized...