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- W2765914079 abstract "Upconversion of low-energy photons into higher energy photons is a non-linear effect that can be strongly enhanced by increasing the intensity of impinging light. Such an enhanced intensity can also be achieved by near-field optical effects in photonic structures. In this paper, we investigate photonic structures in the form of linear gratings with varying periods realised in poly-methyl-methacrylate (PMMA) layers using soft stamps in a thermal nanoimprint process. Master structures were fabricated using e-beam lithography and reactive ion etching in silicon. These master structures were replicated into bi-layer polydimethylsiloxane (PDMS) stamps. PMMA layers with embedded β-NaYF4:25% Er3 + upconverter nanoparticles were applied to glass substrates using spin coating. The PDMS stamps were used to imprint the PMMA layer with very accurate pattern fidelity. The upconversion luminescence around 980 nm was enhanced more than three times by the photonic structure under 1523 nm laser excitation with 0.43 ± 0.02 W/cm2 irradiance, in comparison to a reference sample containing the same amount of upconverter material." @default.
- W2765914079 created "2017-11-10" @default.
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- W2765914079 date "2018-02-01" @default.
- W2765914079 modified "2023-10-17" @default.
- W2765914079 title "Soft thermal nanoimprint of PMMA doped with upconverter nanoparticles" @default.
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- W2765914079 doi "https://doi.org/10.1016/j.mee.2017.11.004" @default.
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