https://scholars.lib.ntu.edu.tw/handle/123456789/398336
標題: | Sensitive Detection of Small Particles in Fluids Using Optical Fiber Tip with Dielectrophoresis | 作者: | Yi-Hsin Tai Dao-Ming Chang Ming-Yang Pan DING-WEI HUANG Pei-Kuen Wei |
關鍵字: | Dielectrophoresis; E.coli; Refractive index; Tapered fiber tip | 公開日期: | 二月-2016 | 卷: | 16 | 期: | 3 | 來源出版物: | MDPI-Sensors | 摘要: | This work presents using a tapered fiber tip coated with thin metallic film to detect small particles in water with high sensitivity. When an AC voltage applied to the Ti/Al coated fiber tip and indium tin oxide (ITO) substrate, a gradient electric field at the fiber tip induced attractive/repulsive force to suspended small particles due to the frequency-dependent dielectrophoresis (DEP) effect. Such DEP force greatly enhanced the concentration of the small particles near the tip. The increase of the local concentration also increased the scattering of surface plasmon wave near the fiber tip. Combined both DEP effect and scattering optical near-field, we show the detection limit of the concentration for 1.36 μm polystyrene beads can be down to 1 particle/mL. The detection limit of the Escherichia coli (E. coli) bacteria was 20 CFU/mL. The fiber tip sensor takes advantages of ultrasmall volume, label-free and simple detection system. © 2016 by the authors; licensee MDPI, Basel, Switzerland. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/398336 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959367132&doi=10.3390%2fs16030303&partnerID=40&md5=321bfd73cde3df3bbd962a6c7c312ec4 |
DOI: | 10.3390/s16030303 | SDG/關鍵字: | Electric fields; Electromagnetic wave scattering; Electrophoresis; Escherichia coli; Optical fibers; Refractive index; Tin oxides; Titanium oxides; E.coli; Escherichia coli (E. coli); Gradient electric fields; Indium tin oxide substrates; Sensitive detection; Surface plasmon waves; Tapered fiber; Thin metallic films; Fibers |
顯示於: | 光電工程學研究所 |
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