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691 results on '"Oh, Sang-Hyun"'

253. Fast vertical mode expansion method for the simulation of extraordinary terahertz field enhancement in an annular nanogap

Author

Hu, Zhen, Lin, Junshan, Lu, Ya Yan, and Oh, Sang-Hyun

Abstract

This paper is concerned with electromagnetic wave scattering of an annular nanogap in the terahertz regime. We present an efficient vertical mode expansion method (VMEM) to solve the scattering problem, and study the extraordinary optical transmission and field enhancement for the nanostructure with various configurations. The VMEM expands the electromagnetic field in and outside the nanogap along the invariant direction by the one-dimensional modes, where the expansion coefficients satisfy scalar two-dimensional Helmholtz equations on the cross-sectional plane. The continuity conditions of electromagnetic fields on the vertical boundaries of neighboring regions are then employed to establish the linear system for the unknown coefficients. Based on the numerical simulations, we investigate the field enhancement in the nanogap. In particular, we investigate the nanostructure with a series of gap sizes and push the gap width limit to 1 nm in the numerical simulation. The normal and oblique incidence cases and the transverse electric (TE) and transverse magnetic (TM) polarization cases are considered.

Published
2018

260. Recent progress in SERS biosensing

Author

Bantz, Kyle C., primary, Meyer, Audrey F., additional, Wittenberg, Nathan J., additional, Im, Hyungsoon, additional, Kurtuluş, Özge, additional, Lee, Si Hoon, additional, Lindquist, Nathan C., additional, Oh, Sang-Hyun, additional, and Haynes, Christy L., additional

Published
2011
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270. Plasmonic nano-structures for optical data storage

Author

Mansuripur, M., primary, Zakharian, A. R., additional, Lesuffleur, A., additional, Oh, Sang-Hyun, additional, Jones, R. J., additional, Lindquist, N. C., additional, Im, Hyungsoon, additional, Kobyakov, A., additional, and Moloney, J. V., additional

Published
2009
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272. Plasmonic nano-structures for optical data storage

Author

Mansuripur, Masud, primary, Zakharian, A. R., additional, Lesuffleur, A., additional, Oh, Sang-Hyun, additional, Jones, R. J., additional, Lindquist, N. C., additional, Im, Hyungsoon, additional, Kobyakov, A., additional, and Moloney, J. V., additional

Published
2009
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273. Chip Level Reliability of MANOS Cells under Operating Conditions

Author

Choi, Eun-Seok, primary, Kim, Se-Jun, additional, Seo, Soon-Ok, additional, Yoo, Hyun-Seung, additional, Park, Kyoung-Hwan, additional, Jung, Sung-Wook, additional, Lim, Se-Yun, additional, Joo, Han-Soo, additional, Kim, Gyo-Ji, additional, Lee, Sang-Bum, additional, Oh, Sang-Hyun, additional, Om, Jae-Chul, additional, Yi, Jeong-Hyong, additional, and Lee, Seok-Kiu, additional

Published
2009
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274. Plasmonic oOptical data storage

Author

Mansuripur, M., primary, Zakharian, A. R., additional, Oh, Sang-Hyun, additional, Jones, R. J., additional, Lesuffleur, A., additional, Lindquist, N. C., additional, Im, Hyungsoon, additional, Kobyakov, A., additional, and Moloney, J. V., additional

Published
2009
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291. A multi-method approach revealing the groundwater-stream water interaction in the Inbuk stream, Korea.

Author

Jeon, Woo-Hyun, Lee, Jin-Yong, Cheong, Woo-Yeong, Park, Yeo-Hyun, Oh, Sang-Hyun, Eum, Dong-Hwi, and Park, Jae-Yong

Subjects
GROUNDWATER research, STREAM chemistry, WATER levels, HYDRAULICS, RIVERS
Abstract

We examined groundwater and stream water interaction in the Inbuk stream, Korea, using various approaches including hydrologic, thermal, hydrochemical, and isotopic methods. For this purpose, we installed four piezometers (IYHW1-4) in the streambed at 10 m interval across the stream and at depths of 0.90 to 1.54 m. We monitored water levels and water temperatures every hour using automatic transducers at the piezometers and in the stream (IYSW1) from September 2013 to April 2014. We also analyzed chemical and isotopic compositions for the hyporheic waters, stream water, and nearby groundwater in early September and late November in 2013. The water levels and hydraulic gradients revealed that three (IYHW1, 2, and 4) of the piezometers were in upwelling conditions for most of the monitoring period, except for the earliest short period (considered to be the wet season), whereas one piezometer (IYHW3) showed a reverse behavior, indicating that the gaining was dominant in the dry period. The mean calculated influx to the stream was 3.04 × 10 cm/sec. Observed temperatures of stream water, hyporheic waters, and groundwater also revealed that stream water was downwelling in the early monitoring period (wet season), whereas the groundwater was generally upwelling in most of the resting period, which is consistent with the water level interpretation. Chemical composition analysis indicated that most of the waters were Ca-HCO type for both seasons. However, no distinctive difference between chemical compositions of water without substantial seasonal variation negated any inference on the flow conditions. The mixing ratios computed from oxygen and hydrogen isotopic compositions indicated that losing conditions were dominant in the wet season, whereas gaining conditions prevailed in the dry season. The interpretations of stream water and groundwater interactions based on these different methods are relatively consistent for this study area, indicating that such combined methods will be very useful in enhancing understanding of groundwater and stream water interaction. [ABSTRACT FROM AUTHOR]

Published
2015
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300. Retention Characteristics of (Bi, La)4Ti3O12-Based FeRAMs

Author

NOH, KEUM HWAN, primary, LEE, SEAUNG-SUK, additional, PARK, EUNG-RYUL, additional, JEONG, HYEOK-JE, additional, SON, JI-HYE, additional, OH, SANG-HYUN, additional, KIM, JIN-GU, additional, SEONGM, JIN-YOUNG, additional, LEE, KYE-NAM, additional, HONG, SUK-KYOUNG, additional, and PARK, YOUNG-JIN, additional

Published
2004
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