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Side-Hole Plastic Optical Fiber for Testing Liquid’s Refractive Index

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PROJECT TITLE :

Side-Hole Plastic Optical Fiber for Testing Liquid’s Refractive Index

ABSTRACT:

A multimode plastic optical fiber with a facet-hole fabricated by precision mechanical drilling technology is presented for refractive index (RI) sensing. A higher sensitivity of $1862.one~mu $ W/RIU, when center wavelength of optical source is 652 nm and launched power is 1 mW, is obtained during a larger hole diameter of $350~mu $ m, indicating that the larger hole diameter can increase the sensitivity of the sensor. Ray-optics technique and finite-distinction time-domain method are both utilized to theoretically evaluate the characteristics of the structure for RI testing, which is well in agreement with the experimental results. Energy field distribution is analyzed to clarify the sensing mechanism of the structure, which demonstrates that the divergent impact of the facet-hole sort of a negative lens is the key to sensing. Thanks to the benefits of comparatively simple fabrication, low price, and capable of continuous measurement, this aspect-hole-based fiber sensing structure is engaging for RI monitoring in chemical, biological, and biochemical sensing region.


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Side-Hole Plastic Optical Fiber for Testing Liquid’s Refractive Index - 4.8 out of 5 based on 90 votes

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