期刊
LAB ON A CHIP
卷 18, 期 4, 页码 595-600出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8lc00008e
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类别
资金
- National Natural Science Foundation of China [61575128, 61425007, 61635007, 61675137]
- Guangdong Natural Science Foundation [2015A030313541, 2015B010105007, 2014A030308007]
- Education Department of Guangdong Province [2015KTSCX119]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20160520163134575, JCYJ20160523113602609, JCYJ20160427104925452, JCYJ20160307143501276]
- Shenzhen University Research Grant [PIDFP-ZR2017009]
Discriminating edible oils from gutter oils has significance in food safety, as illegal gutter oils cannot meet a variety of criteria such as the acid value, peroxide value and quality. To discriminate these illegal cooking oils, we propose an ultrasensitive optofluidic detection method based on a hybrid-waveguide coupler. Prior to the straight waveguide inscription in the cladding of the silica tube using a femtosecond laser, a section of coreless fibre is firstly spliced with the ST to supply a platform for the inscription of an S-band waveguide. Then a pair of microfluidic channels are ablated on the ST using the fs laser to enable liquid analytes to flow in and out of the air channel. In the transmission spectrum, a unique resonant loss dip can be observed, which is produced by coupling the light from the laser inscribed waveguide to the liquid core when the phase-matching condition is met. This hybrid-waveguide coupler with a simplified structure realizes dynamic optofluidic refractive index sensing with an ultrahigh sensitivity of -112 743 nm RIU-1, a detection limit of 2.08 x 10(-5) RIU and a refractive index detection range from 1.4591 to 1.4622. This novel method can be used for food safety detection, specifically, for the discrimination of gutter oils.
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