Fabrication of Whispering Gallery Mode (WGM) microresonator using core-to-core alignment fusion splicer for high sensitive temperature sensor trough optimum coupling gap with high q-factor

Noorbahrin, Nur Aida Syahmina and Mohd Yahaya, Nadrahtul Aqilah and Azahan, Siti Nurul Fatihah and Yusof, Muhammad Khudhori and Mohd Farid, Sabrina and Mohd Asseri, Siti Nurfatinah and Apsari, Retna and Zulkifli, Mohd Zamani (2025) Fabrication of Whispering Gallery Mode (WGM) microresonator using core-to-core alignment fusion splicer for high sensitive temperature sensor trough optimum coupling gap with high q-factor. Results in Optics, 21. pp. 1-9. ISSN 2666-9501

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Abstract

In this work, the fabrication of whispering gallery mode (WGM) microsphere resonators using core-to-core alignment fusion splicer and its application as temperature sensors by optimization of coupling gap is studied and demonstrated. The proposed WGMs microsphere resonators are fabricated using core-to-core alignment fusion splicing technique, and the optimum coupling gap to a tapered fiber is made. Two configurations of coupling gap were tested, which are the 0 µm coupling gap in which both microsphere resonator and tapered fiber contacted, and 10 µm coupling gap. The sensor with 0 µm coupling gap recorded a finesse and Q-factor of 42.792 and 16,069.688 respectively at a resonance wavelength of 1542.69 nm. The sensor with 10 µm coupling gap recorded a finesse and Q-factor of 1.111 and 659.997 respectively at a resonance wavelength of 1544.40 nm. The temperature sensitivity was calculated to be 14.9 pm/◦C, with a wavelength resolution of 6.7 ×10− 2 m◦C and figure of merit (FOM) of 0.11/◦C. The smaller gap resulted in a better sensitivity of the temperature sensor. The sensor has a substantial potential as a cost-effective, highly stable, and easy-to-fabricate. The proposed setup has been proven to be extremely sensitive to environmental changes, making them a highly potential alternative temperature sensor, further increasing their appeal for real world application

Item Type:	Article (Journal)
Uncontrolled Keywords:	Core-to-core alignment fusion splicer, Temperature sensor, Optical fiber, Whispering gallery mode, Microsphere resonator
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Physics Kulliyyah of Science
Depositing User:	Dr M Z Zulkifli
Date Deposited:	19 Nov 2025 16:39
Last Modified:	19 Nov 2025 16:39
Queue Number:	2025-11-Q031
URI:	http://irep.iium.edu.my/id/eprint/124430

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