Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16906
Title: Integrated microfluidic flowmeter based on a micro-FBG inscribed in Co2+-doped optical fiber
Authors: Liu, Z
Tse, MLV
Zhang, AP 
Tam, HY 
Issue Date: 2014
Publisher: Optical Society of America
Source: Optics letters, 2014, v. 39, no. 20, p. 5877-5880 How to cite?
Journal: Optics letters 
Abstract: A novel microfluidic flowmeter integrated with microfiber Bragg grating (μFBG) is presented. Two glass capillaries and a short length of high-light-absorption Co2+ -doped optical fiber were stacked inside a larger outer capillary tube. The stack was then drawn into a tapered device. Two microchannels with the diameter of ∼50 μm were formed inside the capillaries for flowing of microfluidics. An FBG was inscribed in the tapered Co2+ -doped fiber with waist diameter of ∼70 μm , and acts as a flow-rate sensor. A pump laser with wavelength of 1480 nm was utilized to locally heat the μFBG, rendering the μFBG as miniature "hot-wire" flowmeter. The flow rate of the liquid in the micro-channels is determined by the induced wavelength shift of the μFBG. The experimental results achieve a minimum detectable change of ∼16 nL/s in flow rate, which is very promising in the use as part of biochips.
URI: http://hdl.handle.net/10397/16906
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.39.005877
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