Comparative Study on Sensing Properties of Fiber-Coupled Microbottle Resonators with Polymer Materials

Hou Chang Li, Bin Liu*, Meng-Yu Wang, Juan Liu*, Xing-Dao He, Hau Ping Chan, Ping Lu, Jinhui Yuan, Qiang Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Optical whispering gallery mode (WGM) microbottle resonators based on a variety of polymer materials (benzocyclobutene (BCB), UV88 (Relentless, China) and Loctite3525 (HenKel, Germany)) were fabricated and investigated experimentally. The polymer materials were spin-coated onto the fiber and cured by ultraviolet (UV) light followed by heating to form a microbottle structure of different shapes and diameters. The WGMs were excited by tapered fiber, and the spectral characteristics of all realized microbottle cavities were evaluated, such as quality factor (Q > 104), free spectral range and polarization mode (TE and TM). The temperature and refractive index (RI) sensing performance are analyzed and Q-factor changes during the sensing process. In addition, a newly application of UV light intensity sensing for the polymer microbottle resonators was also demonstrated firstly. According to the experimental results that the microbottle resonator of BCB displays good UV light intensity sensitivity (0.0011 nm/(mw/cm2)) and figure of merit (FOM) (0.0122/(mw/cm2)). This sensor is a simple structure, low-cost material, robust performance, and possesses attractive application prospects in sensing and optical devices.

Original languageEnglish
Pages (from-to)26681-26689
Number of pages9
JournalIEEE Sensors Journal
Issue number23
Early online date25 Oct 2021
Publication statusPublished - 1 Dec 2021

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