Laser-Direct-Written polymer WGM microring laser integrated on a fiber tip for refractive index sensing
Abstract
Whispering-gallery-mode (WGM) microlasers are promising for refractometric sensing, but their practical implementation can be limited by the need for stable resonator-coupler alignment. Here, we demonstrate a Rhodamine B-doped polymer WGM microring laser directly fabricated on an optical-fiber tip, eliminating the external resonator-fiber coupling interface at the sensing head. Micro-droplet coating and UV laser direct writing are combined for fabrication, while finite-difference time-domain simulations guide the microring laser design. The microlasers operate in air and water with thresholds of 0.224 uJ and 0.458 uJ, respectively. Refractometric measurements in aqueous glucose solutions yield a bulk refractive index sensitivity of 364.95 nm/RIU and a detection limit of 2.47 x 10^(-4) RIU. Water-induced polymer changes and photobleaching are also investigated. This fiber-tip architecture provides a basis for probe-based refractometric sensing in environmental and biochemical applications.
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BibTeX
@misc{yaghoobi2026laserdirectwritten,
title = {{Laser-Direct-Written polymer WGM microring laser integrated on a fiber tip for refractive index sensing}},
author = {Mobin Yaghoobi and Seyedeh Mahshad Hosseini and Leila Hajshahvaladi and Gholam-Mohammad Parsanasab and Mohammad Ismail Zibaii},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08805},
eprint = {2611.08805},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08805},
}
RIS
TY - UNPB
TI - Laser-Direct-Written polymer WGM microring laser integrated on a fiber tip for refractive index sensing
AU - Mobin Yaghoobi
AU - Seyedeh Mahshad Hosseini
AU - Leila Hajshahvaladi
AU - Gholam-Mohammad Parsanasab
AU - Mohammad Ismail Zibaii
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.08805
UR - https://arxiv.org/abs/2611.08805
AB - Whispering-gallery-mode (WGM) microlasers are promising for refractometric sensing, but their practical implementation can be limited by the need for stable resonator-coupler alignment. Here, we demonstrate a Rhodamine B-doped polymer WGM microring laser directly fabricated on an optical-fiber tip, eliminating the external resonator-fiber coupling interface at the sensing head. Micro-droplet coating and UV laser direct writing are combined for fabrication, while finite-difference time-domain simulations guide the microring laser design. The microlasers operate in air and water with thresholds of 0.224 uJ and 0.458 uJ, respectively. Refractometric measurements in aqueous glucose solutions yield a bulk refractive index sensitivity of 364.95 nm/RIU and a detection limit of 2.47 x 10^(-4) RIU. Water-induced polymer changes and photobleaching are also investigated. This fiber-tip architecture provides a basis for probe-based refractometric sensing in environmental and biochemical applications.
ER -