Graus, Philipp

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Pulsed laser annealing for metallic nanorods embedded in alumina

2018-12-12, Feng, Yuyi, Kemmer, Tobias, Graus, Philipp, Nemitz, Clayton A., Boneberg, Johannes, Huang, Lingling, Liu, Juan, Wang, Yongtian, Schmidt-Mende, Lukas, Leiderer, Paul

Metallic nanorod metamaterials, arrays of vertically aligned nanorods embedded in an alumina matrix (diameter ~80 nm, length 100-250 nm, period ~113 nm), have recently emerged as a flexible platform for applications in photonics, opto-electronics and sensing. The optical constants for these nanostructured materials are directly associated with their crystallinity. Controlling the crystallinity of these metamaterials in a fast manner has presented a new challenge. Here we show a laser annealing with a pulsed Nd:YAG laser (λ = 532 nm, FWHM 15 ns) to rapidly change the crystallinity of the metallic nanorods. The small column X-Ray diffraction characterization shows that not only the crystallinity of the metallic nanorods is changed, but also that evaporation of the metal occurs with laser annealing.

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Nanowire-based metamaterials electrodes for extremely fast charge collection

2018-11-10, Kemmer, Tobias, Graus, Philipp, Leiderer, Paul, Feng, Yuyi, Nemitz, Clayton, Wang, Yongtian, Boneberg, Johannes, Huang, Lingling, Liu, Juan, Schmidt-Mende, Lukas

Metallic nanorod metamaterials, arrays of vertically aligned nanorods embedded in an alumina matrix (diameter ~80 nm, length 100-250 nm, period ~113 nm), have recently emerged as a flexible platform for applications in photonics, optoelectronics and sensing. The optical constants for these nanostructured materials are directly associated with their crystallinity. Controlling the crystallinity of these metamaterials in a fast manner has presented a new challenge. Here we show a laser annealing with a pulsed Nd:YAG laser (λ = 532 nm, FWHM 15 ns) to rapidly change the crystallinity of the metallic nanorods. The small column X-Ray diffraction characterization shows that not only the crystallinity of the metallic nanorods is changed, but also that evaporation of the metal occurs with laser annealing.