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Seongjae Cho,Chen, R.,Sukmo Koo,Shambat, G.,Lin, H.,Namkyoo Park,Vuckovic, J.,Kamins, T. I.,Byung-Gook Park,Harris, James S. IEEE 2011 IEEE photonics technology letters Vol.23 No.20
<P>In this work, a whispering gallery mode (WGM) microdisk resonator based on Ge<SUB>1-</SUB><I>x</I>Sn<I>x</I> grown by molecular beam epitaxy (MBE) was fabricated and characterized. Various process conditions and different Sn contents (4% and 1%) were explored to confirm the feasibility of Ge<SUB>1-</SUB><I>x</I>Sn<I>x</I> for microcavity device operation. Optical modes with wavelengths in the infrared (IR) range beyond 1550 nm were successfully confined in the devices fabricated with different diameters, and free-spectral ranges (FSRs) near 20 nm were obtained.</P>
Seongjae Cho,Min-Chul Sun,Garam Kim,Theodore I. Kamins,Byung-Gook Park,James S. Harris, Jr 대한전자공학회 2011 Journal of semiconductor technology and science Vol.11 No.3
In this work, a tunneling field-effect transistor (TFET) based on heterojunctions of compound and Group IV semiconductors is introduced and simulated. TFETs based on either silicon or compound semiconductors have been intensively researched due to their merits of robustness against short channel effects (SCEs) and excellent subthreshold swing (SS) characteristics. However, silicon TFETs have the drawback of low on-current and compound ones are difficult to integrate with silicon CMOS circuits. In order to combine the high tunneling efficiency of narrow bandgap material TFETs and the high mobility of rn.v TFETs, a Type-I heterojunction tunneling field-effect transistor (I-HTFET) adopting Ge-AIxGa1-xAsGe system has been optimized by simulation in terms of aluminum (AI) composition. To maximize device performance, we considered a nanowire structure, and it was shown that high performance (UP) logic technology can be achieved by the proposed device. The optimum AI composition turned out to be around 20% (x=0.2).
Seongjae Jo,Jinyeong Kim,Yejin Kim,Oh Seok Kwon 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.6
Owing to rapid climate change and increasingly stringent carbon regulations, carbon dioxide detection is becoming more important. In this study, we fabricate a cucurbit[6]uril-functionalized gold nanorod-based localized surface plasmon resonance (LSPR) gas sensor to detect carbon dioxide. The gold nanorods provide a high refractive index unit that enables the measurement of gas molecules with low molecular weights, while cucurbit[6]uril is a chemical receptor that binds to carbon dioxide owing to its structural characteristics. Therefore, cucurbit[6]uril was functionalized through direct adhesion on the surface of gold nanorods, which was replaced with citrate. The manufactured sensor can detect the presence of carbon dioxide at a maximum concentration of 400 ppm in the atmosphere. The high potential applicability of the cucurbit[6]uril-applied LSPR gas sensors is demonstrated in this study.
Ge-on-Si Photodetector with Enhanced Optical Responsivity by Advanced Metallization Geometry
Seongjae Cho,Stanley S. Cheung,Yung Hun Jung,Sae-Kyoung Kang,Dal Ho Lee,Byung-Gook Park 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.4
In this study, a 1550-nm Ge-on-Si photodetector coupled with a Si waveguide on silicon-on-insulator (SOI) platform has been fabricated and characterized with a particular emphasis on the back-end-of-the-line (BEOL) process. A comparison study of the effects of different metallization schemes on the responsivity has been conducted. Compared to the photodetector with a bulk metal contact, those with single-layered and double-layered contact-hole arrays demonstrated improvements in the optical responsivity at an operating voltage of 1 V. Especially, double-layer scheme showed prominent increase in photon-induced current without significant increase in dark current.
Functional Analysis of Novel Collectins
SeongJae Jang,Atsushi Fukuoh,Katsuki Ohtani,Kenichiro Mori,Itsuro Yoshida,Yasuhiko Suzuki,Nobutaka Wakamiya 한국당과학회 2010 한국당과학회 학술대회 Vol.2010 No.1
Collectins are a family of collagenous calcium-dependent defense lectins in animals. Their polypeptide chains consist of four regions: a cysteine-rich N-terminal domain, a collagen-like region, an alpha-helical coiled-coil neck domain and a C-terminal lectin or carbohydrate-recognition domain. These polypeptide chains form trimers that may assemble into larger oligomers. The best studied family members are the mannan-binding lectin, which is secreted into the blood by the liver, and the surfactant proteins A and D, which are secreted into the pulmonary alveolar and airway lining fluid. The collectins represent an important group of pattern recognition molecules, which bind to oligosaccharide structures and/or lipid moities on the surface of microorganisms. Collectin placenta 1 (CL-P1), a recently discovered scavenger receptor, mediates the uptake of oxidized low density lipoprotein and microbes. In this study, we investigated CL-P1-mediated binding and ingestion of yeast-derived zymosan bioparticles using Chinese hamster ovary (CHO) cells stably expressing human CL-P1 (CHO/CL-P1) and human vascular endothelial cells constitutively expressed CL-P1. The uptake of zymosan by CHO/CL-P1 was dependent upon the level of CL-P1 expressed on the membrane and was inhibited by cytochalasin D and wortmannin. The binding of zymosan was also inhibited by ligands of other scavenger receptors such as poly(I) and dextran sulfate. Real time reverse transcription-PCR analyses showed that other scavenger receptors, namely LOX-1, Stabilin-2, or macrophage receptor with collagenous structure (MARCO), were not expressed in human umbilical vein endothelial cells isolated from different individuals. Nonopsonic zymosan ingestion was inhibited in three primary cultured vascular endothelial cells, including different human umbilical vein endothelial cells from nine individuals treated with CL-P1 small interfering RNAs (siRNAs), although small interfering RNAs of other scavenger receptors had no effect on zymosan uptake in these cells. Furthermore, we confirmed that CL-P1 is expressed in human and murine vascular endothelial layers. Our results demonstrated that CL-P1 predominantly mediated phagocytosis for fungi in vascular endothelia.