2 January 2018 Upconverting nanocrystals as luminescent temperature probes for local-heating imaging during direct laser writing 3D nanolithography
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Abstract
Luminescence measurements of upconverting nanocrystals (UCNCs) dispersed in SZ2080 prepolymer being pro- cessed by direct laser writing (DLW) nanopolymerization technique are presented. Er3+ ions doped β-NaYbF4 and Er3+,Yb3+ co-doped β-NaGdF4 core and core-shell UCNCs were prepared by a thermal decomposition method. The ratio of the 2H11/24I15/2 and 4S3/24I15/2 emission intensities under λ = 975 nm excitation was confirmed to follow Boltzmann-type distribution in the temperature range from 20 °C to 200 °C and enabled a self-referenced optical readout of the sample temperature changes. Variation of thermally-coupled spectral bands fluorescence intensity ratio (FIR) was observed while prepolymer being processed under typical DLW conditions (1030 nm, 300 fs, 200 kHz, NA = 0.8) and Epulse varying from below modification threshold to the optical breakdown. Average fitted temperature changes around polymerized voxel measured ∆T1 < 30 °C within polymerization window and increases up to ∆T2~100 °C in overexposing regime.
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Simonas Varapnickas, Dovilė Baziulytė-Paulavičienė, Simas Šakirzanovas, Mangirdas Malinauskas, "Upconverting nanocrystals as luminescent temperature probes for local-heating imaging during direct laser writing 3D nanolithography", Proc. SPIE 10456, Nanophotonics Australasia 2017, 104564F (2 January 2018); doi: 10.1117/12.2283224; https://doi.org/10.1117/12.2283224
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