Open Access
Open access
Optics Express, volume 31, issue 19, pages 31231

In-situ monitoring of refractive index change during water-ice phase transition with a multiresonant fiber grating

Yan Zhou 1, 2
Wenjun Zhou 2
Yang Zhang 3
Rui Pin Chen 1
Jacques Albert 2
Publication typeJournal Article
Publication date2023-09-06
Journal: Optics Express
scimago Q1
wos Q2
SJR0.998
CiteScore6.6
Impact factor3.2
ISSN10944087
Atomic and Molecular Physics, and Optics
Abstract

In-situ monitoring of refractive index changes during a liquid-solid phase transition is achieved by measurement of the transmission spectrum from a single tilted fiber Bragg grating immersed in water. Differential wavelength shifts of multiple mode resonances are used to eliminate cross-talk from temperature, throughout the phase transition, and from strains occurring after solidification. The measured sudden shift of refractive index at the phase transition is shown to be consistent with the expected difference from water to ice, in spite of the observed onset of compressive strain on the fiber by the frozen water. Beyond the obvious application to research on the dynamics of liquid-solid phase transitions, this work demonstrates the multiparameter measurement capabilities of multiresonant gratings.

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