Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Sunjeong Park"'
Autor:
In Hyung Baek, Hyun Woo Kim, Hyeon Sang Bark, Kyu-Ha Jang, Sunjeong Park, Junho Shin, Young Chan Kim, Mihye Kim, Key Young Oang, Kitae Lee, Fabian Rotermund, Nikolay A. Vinokurov, Young Uk Jeong
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-6 (2021)
A travelling wave inside a metal slit can reveal its own waveform by probing deflecting motions of charged particles. Here, a real-time THz oscilloscope was demonstrated by utilizing the relativistic electrons and the subwavelength slit waveguide.
Externí odkaz:
https://doaj.org/article/2f142e755a0d4ca0b097145797f511af
Autor:
Hyun Woo Kim, In Hyung Baek, Junho Shin, Sunjeong Park, Hyeon Sang Bark, Key Young Oang, Kyu-Ha Jang, Kitae Lee, Nikolay Vinokurov, Young Uk Jeong
Publikováno v:
Structural Dynamics, Vol 7, Iss 3, Pp 034301-034301-10 (2020)
The experimental observation of femtosecond dynamics in atoms and molecules by stroboscopic technologies utilizing x ray or electron flashes has attracted much attention and has rapidly developed. We propose a feasible ultrafast electron diffraction
Externí odkaz:
https://doaj.org/article/38199e0d3155469c87cf491371f7ec96
Autor:
Young Chan Kim, Mi Hye Kim, Nikolay Vinokurov, Fabian Rotermund, Sunjeong Park, Kyu-Ha Jang, Hyeon Sang Bark, Young Uk Jeong, In Hyung Baek, Hyun Woo Kim, Kitae Lee, Junho Shin, Key Young Oang
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-6 (2021)
Nature Communications
Nature Communications
The deflection of charged particles is an intuitive way to visualize an electromagnetic oscillation of coherent light. Here, we present a real-time ultrafast oscilloscope for time-frozen visualization of a terahertz (THz) optical wave by probing ligh
Autor:
Fabian Rotermund, Key Young Oang, Sunjeong Park, Jungwon Kim, Mi Hye Kim, Thomas Feurer, Young Chan Kim, Hyun Woo Kim, Kitae Lee, Junho Shin, In Hyung Baek, Young Uk Jeong, Kyu-Ha Jang, Sunglae Cho, Seong Hee Park, Nikolay Vinokurov
Publikováno v:
Nature Photonics. 14:245-249
Stroboscopic visualization of nuclear or electron dynamics in atoms, molecules or solids requires ultrafast pump and probe pulses and a close to perfect synchronization between the two. We have developed a 3 MeV ultrafast electron diffraction (UED) p
Autor:
Hyun Woo Kim, Nikolay Vinokurov, Young Chan Kim, Seong Hee Park, Kyu-Ha Jang, Eun-San Kim, Young Uk Jeong, Sunjeong Park, Hongjoo Kim, Mi Hye Kim, In Hyung Baek
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 927:194-201
Ultrafast Electron Diffraction (UED) system, using an electron bunch of the duration with less than 100 fs and of the energy with 3 MeV, has been developed as a tool probing the ultrafast dynamics in pump–probe experiments. To keep the temporal and
Autor:
Kyu-Ha Jang, Key Young Oang, Jang-Hui Han, Jinhee Nam, Young Chan Kim, Hyun-Woo Kim, Mi Hye Kim, Sunjeong Park, Kitae Lee, Nikolay Vinokurov, Young Uk Jeong, In Hyung Baek, Moonsik Chae
Publikováno v:
Journal of the Korean Physical Society. 74:24-29
We have developed a one-and-half -cell S-band radio-frequency (RF) photoelectron gun (photogun) fed by a coaxial coupler. The RF photogun is dedicated to ultrafast-electron-diffraction experiments by generating electron bunches of 3-MeV energy and a-
Autor:
Sunjeong Park, Youn-kyung Lim
Publikováno v:
CHI
AI assistants that use a voice user interface (VUI), such as AI speakers, have become popular in family homes. However, it is still unclear what roles the AI speaker can support within the family unit. We investigated the roles of an AI speaker as a
Publikováno v:
Korean Society for Emotion and Sensibility. 21:59-70
Autor:
Young Uk Jeong, Hyun Woo Kim, Sunjeong Park, Junho Shin, Jungwon Kim, Kitae Lee, Kyu-Ha Jang, Hyeon Sang Bark, Key Young Oang, In Hyung Baek
Publikováno v:
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
In this talk, we introduce the novel technique for real-time measurement of a ultrafast optical field by utilizing the relativistic electron beam. The direct electron-field interaction of our real-time oscilloscope guarantees the signal integrity of
Autor:
Sunjeong Park, Hyun Woo Kim, Young Uk Jeong, In Hyung Beak, Eun-San Kim, Kyu-Ha Jang, Seong Hee Park, Key Young Oang
Publikováno v:
2019 International Vacuum Electronics Conference (IVEC).
As demanding the ultrashort bunches for the pump & probe experiments to investigate ultrafast phenomena occurring at atomic size level, the diagnostic tools should be developed to measure. by measuring the electron diffraction pattern directly. We ha