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题名: Electro-optical phenomena based on ionic liquids in an optofluidic waveguide
作者: He, XD; Shao, QF(邵群峰); Cao, PF(曹鹏飞); Kong, WJ; Sun, JQ; Zhang, XP(张晓萍); Deng, YQ
收录类别: SCIE ; PubMed ; BIOSIS
出版日期: 2015
刊名: Lab on a Chip
卷号: 15, 期号:5, 页码:1311-1319
出版者: ROYAL SOC CHEMISTRY
出版地: CAMBRIDGE
英文摘要: An optofluidic waveguide with a simple two-terminal electrode geometry, when filled with an ionic liquid (IL), forms a lateral electric double-layer capacitor under a direct current (DC) electric field, which allows the realization of an extremely high carrier density in the vicinity of the electrode surface and terminals to modulate optical transmission at room temperature under low voltage operation (0 to 4 V). The unique electro-optical phenomenon of ILs was investigated at three wavelengths (663, 1330 and 1530 nm) using two waveguide geometries. Strong electro-optical modulations with different efficiencies were observed at the two near-infrared (NIR) wavelengths, while no detectable modulation was observed at 663 nm. The first waveguide geometry was used to investigate the position-dependent modulation along the waveguide; the strongest modulation was observed in the vicinity of the electrode terminal. The modulation phase is associated with the applied voltage polarity, which increases in the vicinity of the negative electrode and decreases at the positive electrode. The second waveguide geometry was used to improve the modulation efficiency. Meanwhile, the electro-optical modulations of seven ILs were compared at an applied voltage ranging from +/- 2 V to +/- 3.5 V. The results reveal that the modulation amplitude and response speed increase with increasing applied voltage, as well as the electrical conductivity of ILs. Despite the fact that the response speed isn't fast due to the high ionic density of ILs, the modulation amplitude can reach up to 6.0 dB when a higher voltage (U = +/- 3.5 V) is applied for the IL [Emim][BF4]. Finally, the physical explanation of the phenomenon was discussed. The effect of the change in IL structure on the electro-optical phenomena was investigated in another new experiment. The results reveal that the electro-optical phenomenon is probably caused mainly by the change in carrier concentration (ion redistribution near charged electrodes), which induces the enhancement and suppression of NIR optical absorption (contributed by C-H and N-H groups) in the vicinity of the negative electrode and positive electrode, respectively.
作者部门: [He, Xiaodong ; Shao, Qunfeng ; Cao, Pengfei ; Kong, Weijie ; Sun, Jiqian ; Zhang, Xiaoping] Lanzhou Univ, Sch Informat Sci & Engn, Lanzhou 730000, Peoples R China ; [Deng, Youquan] Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Green Chem & Catalysis, Lanzhou 730000, Peoples R China
通讯作者: Zhang, XP (reprint author), Lanzhou Univ, Sch Informat Sci & Engn, 222 Tianshui South Rd, Lanzhou 730000, Peoples R China.
学科分类: Biochemistry & Molecular Biology; Chemistry; Science & Technology - Other Topics
文章类型: Article
所属项目编号: National Natural Science Foundation of China [21373247, 61205204] ; Fundamental Research Funds for the Central Universities [lzujbky-2014-46, lzujbky-2014-44, lzujbky-2014-236]
所属项目名称: 国家自然科学基金项目 ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; LZU
语种: 英语
DOI: 10.1039/c4lc01434k
ISSN号: 1473-0197
WOS记录号: WOS:000349838200011
PM记录号: 25582948
BIOSIS记录号: BCI:BCI201500288941
IR记录号: BCI:BCI201500288941
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/116289
Appears in Collections:信息科学与工程学院_期刊论文

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Recommended Citation:
He, XD,Shao, QF,Cao, PF,et al. Electro-optical phenomena based on ionic liquids in an optofluidic waveguide[J]. LAB ON A CHIP,2015,15(5):1311-1319.
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