Journal
OPTICS EXPRESS
Volume 22, Issue 19, Pages 22802-22807Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.022802
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Funding
- Ministry of Education, Malaysia
- Malaysia and Universiti Putra Malaysia under Research University [05-02-12-2015RU]
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We demonstrate refractive index sensors based on single mode tapered fiber and its application as a biosensor. We utilize this tapered fiber optic biosensor, operating at 1550 nm, for the detection of protein (gelatin) concentration in water. The sensor is based on the spectroscopy of mode coupling based on core modes-fiber cladding modes excited by the fundamental core mode of an optical fiber when it transitions into tapered regions from untapered regions. The changes are determined from the wavelength shift of the transmission spectrum. The proposed fiber sensor has sensitivity of refractive index around 1500 nm/RIU and for protein concentration detection, its highest sensitivity is 2.42141 nm/% W/V. (C) 2014 Optical Society of America
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