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Kim, Hyounguk,Jung, Kinam,Yeo, Seon Ju,Chang, Wonseok,Kim, Jeong Je,Lee, Kwanil,Kim, Young Dong,Han, Il Ki,Kwon, S. Joon The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.45
<P>Near-infrared (NIR) waveguides are a key component of planar photonic devices such as optical communication couplers, image sensors, and spectroscopes for chemical or biological molecules. Conventional NIR waveguides used for signal transmission include silicon-on-insulator (SOI) waveguides and channel/ridge-type metal micro-strips. However, these waveguides usually have limitations of either signal delay or signal loss in optically integrated devices. In this study, a novel NIR waveguide composed of a semi-disordered array of metal nanoparticles (sDAMNPs) on Si substrate was proposed, fabricated, and tested. The disordered metallic nanoparticles array is geometrically localized in the form of 1D metal strips, thus replacing sDAMNPs with less lossy micro strip channel waveguides. From the measurements supported by various computational models, the fabricated waveguides operate effectively in the broadband NIR region (1100 to 1700 nm). The waveguide does not support signal transmission in the ultra violet-visible spectrum due to strong signal absorption, scattering, and localization effects inside the metal nanoparticles. Instead, it is capable of transmitting NIR over a distance longer than 100 μm (signal loss ∼3.85 dB per 100 μm for NIR from 1200 to 1600 nm), which is also sufficiently longer than the conventional surface plasmon polariton propagation distance at the metal-Si interface. Compared to a waveguide-free reference, the waveguide exhibited greatly improved signal transmission efficiency up to a factor of 7.42 × 10<SUP>4</SUP> at 1367 nm. It also exhibits a high deflection angle sensitivity of 1.89 dB per 0.01 rad, thus efficiently and straightly guiding the broadband NIR signal over a long distance.</P>
정재경(Jaekyoung Jeong),김용래(Yongrae Kim),김형욱(Hyounguk Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The application of Dimethyl ether (DME) as an alternative fuel is recently studied. In this paper, the characteristics<br/> of DME spray were investigated in a combustion bomb under high temperature and pressure. To obtain this<br/> condition, a mixture composed of C2H2, O2 and N2 had burned in the combustion bomb as preliminary stage. Images<br/> of DME spray were taken with using a Mie scattering and Shadowgraph method under a evaporating condition and<br/> a non-evaporating condition. In a non-evaporating condition, spray angle was more wider and spray tip penetration<br/> length was more shorter under high ambient pressure than under low ambient pressure. Comparing with a nonevaporating<br/> condition, a development of spray tip penetration length of liquid phase was limited in a evaporating condition.