Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/app11177881
Keywords
optical interconnects; self-written waveguides; optical simulation; refractive index measurements; thermal simulation; optical sensor
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD [EXC 2122, 390833453]
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By adjusting the curing time of the self-written waveguide, material parameters can be controlled, affecting the optical response with temperature changes. Limiting the curing time changes the internal conditions that cause an increase in optical transmission.
In this work, we investigated the optical response of a self-written waveguide (SWW) in detail by heating the structure from room temperature up to 60 degrees C. Previous results indicated a decrease in the optical transmission with increasing temperature for certain waveguide parameters. Based on new experimental measurements, we have identified material parameters resulting in opposite behaviour. An experimental setup was conceived to verify these results. Hereby, we were able to show that we can adjust material parameters such as refractive index and the corresponding density of the material by adapting the curing time applied during the fabrication of the waveguides. This, in turn, affects the material's response during the heating process. We showed that a limitation of the external curing time changes the internal conditions of the SWW and the cladding in a manner that the numerical aperture increases with the temperature, which subsequently also results in an increase in the optical transmission. In this study, we explain this unexpected behavior of the SWW and point towards possible future applications.
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