標題: Reconfigurable liquid-core/liquid-cladding optical waveguides with dielectrophoresis-driven virtual microchannels on an electromicrofluidic platform
作者: Fan, Shih-Kang
Lee, Hsuan-Ping
Chien, Chia-Chi
Lu, Yi-Wen
Chiu, Yi
Lin, Fan-Yi
材料科學與工程學系
電機學院
Department of Materials Science and Engineering
College of Electrical and Computer Engineering
公開日期: 2016
摘要: An electrically reconfigurable liquid-core/liquid-cladding (L-2) optical waveguide with core liquid gamma-butyrolactone (GBL, n(core) = 1.4341, epsilon(core) = 39) and silicone oil (n(cladding) = 1.401, epsilon(cladding) = 2.5) as cladding liquid is accomplished using dielectrophoresis (DEP) that attracts and deforms the core liquid with the greater permittivity to occupy the region of strong electric field provided by Teflon-coated ITO electrodes between parallel glass plates. Instead of continuously flowing core and cladding liquids along a physical microchannel, the DEP-formed L-2 optical waveguide guides light in a stationary virtual microchannel that requires liquids of limited volume without constant supply and creates stable liquid/liquid interfaces for efficient light guidance in a simply fabricated microfluidic device. We designed and examined (1) stationary and (2) moving L-2 optical waveguides on the parallel-plate electromicrofluidic platform. In the stationary L-shaped waveguide, light was guided in a GBL virtual microchannel core for a total of 27.85 mm via a 90 degrees bend (radius 5 mm) before exiting from the light outlet of cross-sectional area 100 mu m x 100 mu m. For the stationary spiral waveguide, light was guided in a GBL core containing Rhodamine 6G (R6G, 1 mM) and through a series of 90 degrees bends with decreasing radii from 5 mm to 2.5 mm. With the stationary straight waveguide, the propagation loss was measured to be 2.09 dB cm(-1) in GBL with R6G (0.01 mM). The moving L-shaped waveguide was implemented on a versatile electromicrofluidic platform on which electrowetting and DEP were employed to generate a precise GBL droplet and form a waveguide core. On sequentially applying appropriate voltage to one of three parallel L-shaped driving electrodes, the GBL waveguide core was shifted; the guided light was switched at a speed of up to 0.929 mm s(-1) (switching period 70 ms, switching rate 14.3 Hz) when an adequate electric signal (173.1 V-RMS, 100 kHz) was applied.
URI: http://dx.doi.org/10.1039/c5lc01233c
http://hdl.handle.net/11536/133185
ISSN: 1473-0197
DOI: 10.1039/c5lc01233c
期刊: LAB ON A CHIP
Volume: 16
Issue: 5
起始頁: 847
結束頁: 854
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