No-core fiber by self-image length optimization for optical based refractive index sensor

Razali, Nazirah Mohd and Lokman, Muhammad Quisar and Zuikafly, Siti Nur Fatin and Ahmad, Fauzan and Rahman, Mohd Azizi Abdul and Yahaya, Hafizal and Harun, Sulaiman Wadi (2022) No-core fiber by self-image length optimization for optical based refractive index sensor. Optical Fiber Technology, 74. ISSN 1068-5200, DOI

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No-core fiber has been widely demonstrated as an alternative refractive index sensor over conventional optical fiber sensors. However, previous works demonstrated that the self-image length optimization of this sensor only focused on simulation and formed a conclusion without data analysis. Hence, the sensitivity provided does not follow the standard unit, providing a limited evaluation of the sensitivity for refractive index measurement. This paper investigates the no-core fiber at a fixed diameter of 125 mu m and varies the length based on the self-image index ranging from 1 to 4 indexes to evaluate the sensor sensitivity at the analyte refractive index ranging from 1.3000 RIU to 1.4000 RIU via experimental study. The results showed that the dip wavelength shift non-linearly increased for all the samples as the analyte refractive index increased. The overall analysis showed that there were significant changes in the sensitivity between the odd and even self-image indexes, and there were no significant sensitivity changes between them. The best sensor performance was achieved by the NCF length of 2.90 cm with two self-image indexes. The sensitivity achieved by the sensor was 104.64 nm/RIU and 241.30 nm/ RIU for analyte refractive index ranging from 1.3000 RIU to 1.3600 RIU and 1.36000 RIU to 1.4000 RIU, respectively, via a linear fitting plot. Meanwhile, the figure merit value obtained by the sensor was 1.45 RIU-1 and 3.75 RIU-1 at analyte RI of 1.3600 RIU and 1.4000 RIU, respectively. In the future, this can be used as a reference for no core fiber length optimization.

Item Type: Article
Funders: None
Uncontrolled Keywords: No-core fiber; Self-image; Refractive index; Sensitivity
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 22 Nov 2023 09:13
Last Modified: 22 Nov 2023 09:13

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