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Proceedings Paper

The liquid/liquid-waveguide-based absorption sensor
Author(s): Xuechun Li; Y. C. Seow; Jian Wu; Kun Xu; Jintong Lin; A. Q. Liu
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Paper Abstract

A light absorption sensor is based on phenomena of light absorption between in two flow stream layers with different refractive index in liquid/liquid (L2) waveguide in this letter. The diffusion between the core and the cladding forms the tapered L2 waveguide sensor. The taper can be controlled by the flow rates of the core and the cladding layers. The absorption sensor is fabricated using PDMS onto a microfluidic chip, which chip size is 3.5cm × 3cm and the absorption length is 2cm. Two different aqueous dye solutions such as rhodamin 6G and methylene blue are measured and approved by the experimental results of the absorption sensor. The limitation of detection is 0.5ng/mL for rhodamin 6G and 0.16ng/mL for methylene blue. The L2 waveguide absorption sensor has high potential usage for the biological, chemical and medical measurement applications.

Paper Details

Date Published: 23 February 2009
PDF: 6 pages
Proc. SPIE 7278, Photonics and Optoelectronics Meetings (POEM) 2008: Fiber Optic Communication and Sensors, 72780U (23 February 2009); doi: 10.1117/12.821588
Show Author Affiliations
Xuechun Li, Beijing Univ. of Posts and Telecommunications (China)
Nanyang Technological Univ. (Singapore)
Y. C. Seow, Nanyang Technological Univ. (Singapore)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Kun Xu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)
A. Q. Liu, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 7278:
Photonics and Optoelectronics Meetings (POEM) 2008: Fiber Optic Communication and Sensors
Dieter Stefan Jäger; Deming Liu; Ping Shum, Editor(s)

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