K
Kyu-Ha Jang
Researcher at Seoul National University
Publications - 71
Citations - 660
Kyu-Ha Jang is an academic researcher from Seoul National University. The author has contributed to research in topics: Terahertz radiation & Photonic crystal. The author has an hindex of 11, co-authored 63 publications receiving 600 citations. Previous affiliations of Kyu-Ha Jang include Korea University of Science and Technology.
Papers
More filters
Journal ArticleDOI
Superradiant terahertz Smith-Purcell radiation from surface plasmon excited by counterstreaming electron beams
TL;DR: In this paper, evanescent tunneling transmission of effective surface plasmon polaritons between two counterstreaming electron beams noticeably increases Smith-Purcell radiation (SPR) intensity by about two orders of magnitude as well as lower its transition threshold from a spontaneous emission to a stimulated one.
Journal ArticleDOI
Microfabrication of millimeter wave vacuum electron devices by two-step deep-etch x-ray lithography
Young-Min Shin,Jin-Kyu So,Seong-Tae Han,Kyu-Ha Jang,Gun-Sik Park,Jong-Hyun Kim,Suk-Sang Chang +6 more
TL;DR: In this paper, the discrepancies of eigenfrequency between experiment and simulation are within 1.1% in a coupled-cavity structure and 1.4% in folded waveguide structure when the operating frequency is about 100GHz.
Journal ArticleDOI
Low-voltage operation of Ka-band folded waveguide traveling-wave tube
Seong-Tae Han,Kyu-Ha Jang,Jin-Kyu So,Jung-Il Kim,Young-Min Shin,Nikita M. Ryskin,Suk-Sang Chang,Gun-Sik Park +7 more
TL;DR: In this article, low-voltage operation of millimeter-wave folded waveguide traveling-wave tube (TWT) was investigated using a 12 kV linear electron beam.
Journal ArticleDOI
Evanescent tunneling of an effective surface plasmon excited by convection electrons.
TL;DR: A comparative analysis of dielectric homogenization and a finite-difference-time-domain simulation shows that out-of-phase-like modes (pi modes) have strong transmission below the cutoff frequency relying on the parametric condition of structural dimension and electronic energy.
Journal ArticleDOI
Investigations on a microfabricated FWTWT oscillator
Seong-Tae Han,Jin-Kyu So,Kyu-Ha Jang,Young-Min Shin,Jong-Hyun Kim,Suk-Sang Chang,Nikita M. Ryskin,Gun-Sik Park +7 more
TL;DR: In this article, a folding-wave-guide traveling-wave tube (FWTWT) was fabricated by computer numerical control milling in advance and applied to a delayed feedback oscillator.