The extrusion nozzles of three low cost desktop 3D printers are characterised using optical fibre Bragg gratings. Temperature profiles show remarkably consistent distributions pointing to operation as good quality micro-furnaces potentially not only for 3D printing but also optical fibre drawing.
We show that the surface properties of Au thin films on a glass prism, typical of the Krestchsmann setup for SPR generation, can be modified or tuned with optical exposure. The wetting properties of the film were investigated by measuring contact angles of water drops at room temperature <i>T</i> = 23 °C. These contact angle change with optical irradiation from below the film. This change corresponds to a maximum contact angle reduction of <i>Δθ<sub>c</sub></i> ~ 30° when a surface plasmon resonance (SPR) is excited. The variation in contact angle during drop evaporation is evaluated under different irradiation conditions.