Transient submicron temperature imaging based on the fluorescence emission in an Er/Yb co-doped glass-ceramic
Sedmak I., Urbančič I., Štrancar J., Mortier M., Golobič I.
© 2015 Elsevier B.V. All rights reserved. A comprehensive understanding of the transient heat- and mass-transfer processes on the submicron scale requires the development of novel, non-invasive, temperature-measurement techniques. Here, we present a fluorescence-based method for the non-invasive characterization of transient temperature fields on a submicron scale using a temperature-sensitive erbium/ytterbium co-doped transparent glass-ceramic. This inorganic material is more stable against degradation and photobleaching than traditional organic dyes. Transient heat-conduction experiments were performed on an Er:GPF1Yb0.5Er glass-ceramic sample, which was simultaneously used as a temperature sensor. The temperatures were determined by measuring the fluorescence spectrum and by measuring the intensity variations of the emission spectrum in the temperature range between 25 and 150°C. A spatial resolution of 400 nm was achieved across an approximately 200 μm x 200 μm field of view at an imaging frequency of 7 Hz. The conducted experiments demonstrate that Er-doped glass-ceramics permit non-invasive and transient thermal imaging and can be adopted for the analysis of heat-transfer processes on submicron scales.