Laudatio on the Occasion of Gustav Schweiger’s 75th Birthday

Prof. em. Dr. techn. Gustav Schweiger (Source: RUB)

Prof. em. Dr. techn. Gustav Schweiger (Source: RUB)

As proud members of Professor Gustav Schweiger group, it is a great honor to write this laudatio on the occasion of his 75th birthday. He was more than just a group leader; he was more a teacher and mentor. He has always an open ear for all the problems which occur in the everyday scientific life.

He was born on the 17 November 1940 in Knittelfeld, Austria. After his studies of technical physics in Graz and Vienna he received in 1972 his PhD at the German Aerospace Center DLR in Cologne. There, he began his thermodynamical studies on gases. In 1974 he moved to the University of Duisburg, where he started his studies on aerosols and became an expert on the characterization of aerosol particles with help of optical techniques.

Prof. Schweiger was one of the first researchers in Germany who introduced the laser as a new tool for spectroscopic studies, e.g. on the measurement of phase equilibria on binary systems with Raman spectroscopy. He applied the Raman scattering technique on single droplets levitated in optical and electrodynamic traps. At the same time, he discovered output resonances on droplet chains and single particles.

In 1992, as the leader of the chair of Applied Laser Technology and Measuring Systems at the Ruhr-Universität Bochum, he brought his outstanding knowledge in optical technologies to Bochum. Beside the experimental studies, he always tried to understand the things theoretically.

Therefore, he developed a geometrical optics based model to describe the inelastic scattering on particles. In the mid-nineties he found his new scientific love in the structural resonances on spherical particles. It started with the excitation of resonances in the inelastic scattering of levitated droplets. For the theoretical description of resonances, Schweiger developed a geometrical optics based model, which gives an intuitive insight of the physics of structural resonances.

With his idea of the microparticle array sensor he opens the door for practicable applications of whispering gallery modes. Also, his ideas on the manufacturing with optical tweezers he brought a new tool for microassembling into play. Even after his retirement in 2008, he is still deeply involved in our research. At this point, we want to thank Professor Schweiger for the ideas and inspiration he gives to us in the many years we could work together. We wish him continued success in his scientific work.

Thomas Weigel and Cemal Esen

Reference: Th. Weigel, C. Esen & A. Ostendorf: Spherical Microresonators : Particular type of ultra-sensitive optical tool for various sensing applications, first published online: 16 DEC 2015 | DOI: 10.1002/opph.201500038

Link: Chair of Applied Laser Technologies (LAT; A. Ostendorf, C. Esen, E. Gurevich), Ruhr-Universität Bochum, Bochum, Germany

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