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Award for Manish Sharma

Our Student Manish Sharma (International Master course "Lasers and photonics") was decorated with the "Materials Horizons Oral Price" at the 10th CIRP Conference on Photonics Technologies (LANE 2018). He presented his work "Laser metal deposition of lattice structures by columnar built-up".

Laser induced surface structures in reduced graphene oxide layers

We present a study on the appearance of laser induced periodic surface structures while reducing thin film layers of graphene oxide with femtosecond laser pulses. The relation of laser fluence, the induced chemical modification of the graphene oxide layer and the appearance of these periodic surface structures is analyzed by means of Raman spectroscopy and 2D FFT.

Maren Kasischke, Stella Maragkaki, Sergej Volz, Andreas Ostendorf, Evgeny L. Gurevich, Simultaneous nanopatterning and reduction of graphene oxide by femtosecond laser pulses, Applied Surface Science, Volume 445, 2018

DOI 10.1016/j.apsusc.2018.03.086

Award for Gordon Zyla

The research of our colleague Gordon Zyla was decorated with a "Best Student Paper Award" at SPIE Photonisc West.
In his talk, he reported the successful manufacturing of a lamellar nanostructure that mimics the ridge shape of the Morpho butterfly using a 3d-direct laser writing technique.

G. Zyla, A. Kovalev, M. Grafen, E. L. Gurevich, C. Esen, A. Ostendorf, S. Gorb, Generation of bioinspired structural colors via two-photon polymerization, Scientific Reports, Springer Nature, 2017, 7

DOI 10.1038/s41598-017-17914-w

Monitoring of soot in ambient air

If particulate matter is illuminated with laser light the backscattered light shows wavelength shifts (Raman shift) which can be connected to various particle properties. A recently published article by Markus Grafen shows how the quantity of soot particles can be derived from Raman spectra of sparsely loaded aerosol filters. During a field campaign the Raman Soot Spectrometer (RaSoS) was stationed in the city of Duisburg for about three weeks and delivered one spectrum per hour.

The article is still available for free under.