Abstract
In this letter, we investigate the response of poly(methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs) after immersion inmethanol/water solutions at room temperature. As the glass transition temperature of solution-equilibrated PMMA differs from the one of solvent-free PMMA, different concentrations of methanol and water lead to various degrees of frozen-in stress relaxation in the fiber. After solvent evaporation, we observe a permanent blue-shift in the grating resonance wavelength. The main contribution in the resonance wavelength shift arises from a permanent change in the size of the fiber. The results are compared with conventional annealing. The proposed methodology is cost-effective as it does not require a climate chamber. Furthermore, it enables an easy-to-control tuning of the resonance wavelength of POFBGs.
Original language | English |
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Journal | I E E E Photonics Technology Letters |
Volume | 29 |
Issue number | 8 |
Pages (from-to) | 687-690 |
ISSN | 1041-1135 |
DOIs | |
Publication status | Published - 2017 |
Keywords
- Annealing
- Plastic optical fiber
- Optical fiber sensors
- Bragg gratings
- Polymers
- Absorption