Step-etched U-bent silica fiber optic probes – Design and optimum geometry for refractive index sensing

Rajamani, A.; Manoharan, Hariharan; Danny, Christina Grace; Kishore, P.V.N.; Sai, V. V. R.

doi:10.1016/j.sna.2022.113615

Cited by 5 publications

(1 citation statement)

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“…When the polished depth (d p ) continues to increase, the change of the RI of cladding becomes smaller, and the influence of the effective radius of the optical fiber becomes larger, so the V-number decreases, as a sequence, the sensitivity of the V-bent sensor probe decreases too. Because of bending, the RI of the fiber core (n co ) also changes, which decreases with the decrease of the intersection angle (2φ) and circular chamfer radius (r) [17], so bending parameters also affect evanescent field. When For comparison with the sensitivity of the RI sensor in paper [3], the sensitivity value of 174.687 dB/RIU can be transformed into 1685.6%/RIU which is higher than the sensitivity 1541%/RIU in [3].…”

Section: Discussionmentioning

confidence: 99%

Innovative sensor for refractive index monitoring based on a plastic optical fiber side-polished in a ‘V’-bent structure

Wang¹,

Sun²,

Ning³

et al. 2023

Meas. Sci. Technol.

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An innovative probe design, based on plastic optical fiber which has been designed around a side-polished fiber, bent into a ‘V’ shape, is reported. Such a probe offers an innovative approach to monitoring of the surrounding refractive index of the material under study. The underlying principle is that such a side-polished optical fiber configured in this way can give rise to an enhanced evanescent field. This structure, with the optical fiber slot, was used to fix the side-polished plastic optical fiber. As a result, the plastic optical fiber (POF) probe created this way has been optimized using different intersection angles, circular chamfer radius and different polished depths. The maximum sensitivity achieved with the use of this probe reaches 206.4 dB/Refractive Index Unit over the range of refractive index from 1.33 to 1.40. In the design, the half intersection angle, the circular chamfer radius and the polished depth were set to 30°, 1.12mm and 194.6μm, respectively. Such a probe based on inexpensive plastic optical fiber has significant potential for a variety of low-cost, refractive index sensing applications.

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Section: Discussionmentioning

confidence: 99%