Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Joong Wook Lee"'
Autor:
Hyeongmun Kim, Chul Kang, Dogeun Jang, Yulan Roh, Sang Hwa Lee, Joong Wook Lee, Jae Hee Sung, Seong Ku Lee, Ki-Yong Kim
Publikováno v:
Light: Science & Applications, Vol 13, Iss 1, Pp 1-13 (2024)
Abstract Terahertz (THz) waves, known as non-ionizing radiation owing to their low photon energies, can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and space. Here, we demonstrate the g
Externí odkaz:
https://doaj.org/article/71a8dd17d3134c638b815357d53759b5
Autor:
Sungjae Yoo, Jaewon Lee, Hajir Hilal, Insub Jung, Woongkyu Park, Joong Wook Lee, Soobong Choi, Sungho Park
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-10 (2022)
The spatial configuration of nanostructure building blocks determines the physical and optical properties of their superstructures. Here, the authors report on complex nanoparticles in which different geometric forms of nanoframes are nested into a s
Externí odkaz:
https://doaj.org/article/fd19fb0e06d346048627345ad83cfa40
Autor:
Hajir Hilal, Qiang Zhao, Jeongwon Kim, Sungwoo Lee, MohammadNavid Haddadnezhad, Sungjae Yoo, Soohyun Lee, Woongkyu Park, Woocheol Park, Jaewon Lee, Joong Wook Lee, Insub Jung, Sungho Park
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-10 (2022)
Most SERS-active nanostructures suffer from low robustness against misalignment to field polarization. Here, the authors demonstrate three-dimensional nanoframes of octahedral geometry, with two rims engraved on each facet, as polarization-independen
Externí odkaz:
https://doaj.org/article/4fab95404324407f8d82ecda2659514f
Publikováno v:
Applied Sciences, Vol 11, Iss 22, p 10594 (2021)
In this study, we developed a rapid nondestructive tool for testing rust spread in a metal covered by a paint layer by using a THz time-domain spectroscopy system at a speed of 100 Hz/pixel. Time-of-flight imaging helps identify rust formation by exc
Externí odkaz:
https://doaj.org/article/7025ebb8888c4918b5df770da7d05765
Autor:
Hyung Keun Yoo, Soo Bin Cho, Sae June Park, Yeong Hwan Ahn, Chul Kang, In-Wook Hwang, Joong Wook Lee
Publikováno v:
Applied Sciences, Vol 11, Iss 6, p 2765 (2021)
Optically controlled spectral-band selective terahertz (THz) modulators based on metal-organic hybrid metamaterials were investigated. An artificially structured material, which consists of two single split-ring resonators put together on the split g
Externí odkaz:
https://doaj.org/article/82c46908f988460b91a750ff03f05e17
Publikováno v:
Nanomaterials, Vol 10, Iss 8, p 1589 (2020)
We used low-temperature reactions to synthesize different-sized CdSe quantum dots (QDs) capped with fatty-acid and phosphine ligands. From the correlation of high-resolution transmission electron microscopy and X-ray diffraction (XRD) analyses of the
Externí odkaz:
https://doaj.org/article/f8d49377693c4069ad98a3b8b6f2dedd
Autor:
In-Sung Lee, Joong Wook Lee
Publikováno v:
Applied Sciences, Vol 10, Iss 6, p 2055 (2020)
The demand for internal nondestructive testing and inspection techniques is rapidly increasing. Using a continuous wave (CW) terahertz (THz) imaging system, we demonstrate that the internal defects in cross-linked polyethylene (XLPE) plates for power
Externí odkaz:
https://doaj.org/article/b7f8465179d6403eab1becf26f71122d
Autor:
Hyung Keun Yoo, Hanju Lee, Kiejin Lee, Chul Kang, Chul-Sik Kee, In-Wook Hwang, Joong Wook Lee
Publikováno v:
AIP Advances, Vol 7, Iss 10, Pp 105008-105008-6 (2017)
We demonstrate the conditions for optimal modulation efficiency of active terahertz modulators based on phenyl-C61-butyric acid methyl ester (PCBM)-silicon hybrid structures. Highly efficient active control of the terahertz wave modulation was realiz
Externí odkaz:
https://doaj.org/article/c25b0373e4b5433a8bb34a33f222d796
Publikováno v:
AIP Advances, Vol 6, Iss 11, Pp 115310-115310-6 (2016)
We demonstrate the characteristics of the optical control of terahertz (THz) wave transmission in photoexcited bilayers of pentacene/Si and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene)/Si. The modulation efficiency is influenced sign
Externí odkaz:
https://doaj.org/article/1adff8085411469aaa96b6d0f9e2ea0b
Autor:
Myeong-Seong Song, In-Seong Lee, Ik-Bu Sohn, Chul Kang, Chul-Sik Kee, Jin-Kyu Yang, Joong Wook Lee
Publikováno v:
AIP Advances, Vol 5, Iss 4, Pp 047107-047107-5 (2015)
We investigate the characteristics of multi-mode resonances in T-shape air slots at terahertz frequencies. Our results show that the multimode resonance is caused by the structural complexity of the T-shape air slot resonators. Each resonance mode co
Externí odkaz:
https://doaj.org/article/84a0897ae16f4b2991a2157520fe74a0