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This research aims to develop gelatin-methacrylamide hydrogels with tunable refractive index through UV-induced photopolymerization.

May 29, 2026Applied Physics BOpen Access

Optical characterization by a fiber-optic system of UV-induced refractive index modulation in gelatin–methacrylamide hydrogels

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Randomized trial demonstrates refractive index modulation in hydrogels, suggesting new applications in biophotonics.

This research aims to develop gelatin-methacrylamide hydrogels with tunable refractive index through UV-induced photopolymerization.
Hydrogels synthesized using non-toxic components
Characterization performed via fiber-optic refractometry and validated with Abbe refractometer
Dynamic light scattering and Raman spectroscopy used to analyze polymer dimensions and responses.
UV irradiation produced RI modulation from 1.32 to 1.36 at 1310 nm with R^2 = 0.996
Residual dissolved oxygen inhibited early photopolymerization leading to reduced polymer dimensions
Uniform polymer growth followed oxygen depletion resulted in predictable RI increases with irradiation time.

Czubek et al. (2026) studied this question.

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