Transient submicron temperature imaging based on the fluorescence emission in an Er/Yb co-doped glass-ceramic
Sedmak, Ivan, 1978- ...
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 [micro]m x 200[micro]m transparent glass-ceramicsm 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.
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