Yonghwi Kim
California Institute of Technology
19 Papers
131 Citations
Yonghwi Kim is an academic researcher from California Institute of Technology. The author has contributed to research in topics: Surface plasmon resonance & Glass transition. The author has an hindex of 11, co-authored 19 publications. Previous affiliations of Yonghwi Kim include Yonsei University.
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Papers
Phase Modulation with Electrically Tunable Vanadium Dioxide Phase-Change Metasurfaces
Yonghwi Kim,Pin Chieh Wu,Ruzan Sokhoyan,Kelly W. Mauser,Rebecca Glaudell,Ghazaleh Kafaie Shirmanesh,Harry A. Atwater +6 more
TL;DR: A dynamically tunable reflectarray metasurface that continuously modulates the phase of reflected light in the near-infrared wavelength range under active electrical control of the phase transition from semiconducting to semimetallic states is reported.
Metallic glass formation in highly undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 during containerless electrostatic levitation processing
TL;DR: In this article, the final solidification product of the sample was determined by x-ray diffraction to have an amorphous phase and the critical cooling rate required to avoid crystallization during solidification of the Zr41.5 alloy fell between 0.9 and 1.2 K/s.
Experimental determination of a time–temperature‐transformation diagram of the undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 alloy using the containerless electrostatic levitation processing technique
TL;DR: In this paper, high temperature high vacuum electrostatic levitation was used to determine the complete time-temperature-transformation (TTT) diagram of the Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metallic glass forming alloy in the undercooled liquid state.
Self-aligned colocalization of 3D plasmonic nanogap arrays for ultra-sensitive surface plasmon resonance detection.
TL;DR: extremely sensitive plasmonic detection that was performed label-free based on the colocalization of target DNA molecules and electromagnetic hot spots excited at 3D nanogap arrays to achieve significantly amplified optical signatures that lead to sensitivity enhancement in terms of detectable binding capacity in reference to conventional thin film-based surface plasMon resonance detection.
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Systematic study on the sensitivity enhancement in graphene plasmonic sensors based on layer-by-layer self-assembled graphene oxide multilayers and their reduced analogues
Kyungwha Chung,Adila Rani,Ji Eun Lee,Ji Eun Kim,Yonghwi Kim,Yonghwi Kim,Heejin Yang,Sang Ouk Kim,Dong-Hyun Kim,Dong Ha Kim +9 more
TL;DR: Graphene oxide (GO) and reduced graphene oxide (rGO) thin films on Au films and their refractive index (RI) sensitivity was compared for the first time in SPR-based sensors to reveal the role of graphenes on the plasmonic sensors.
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