MBI STAFF MEMBER
Ruediger Grunwald
 


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Dr. Ruediger Grunwald

grunwald@mbi-berlin.de

+49 30 6392 - 1457

Senior Scientist, Group Leader

Member of Project 1.2

 

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Research Topics


Short introduction:

Spatio-temporal shaping and characterization of ultrashort wavepackets


hail of beamsUltrafast Nondiffacting Optics and Ultrafast Singular Opticsopen new prospects for the study of fundamental problems of optical physics as well as future applications. For the spatio-temporal shaping and diagnosing few-cycle wavepackets, in particular for the flexible generation of nondiffracting pulses and pulses with orbital angular momentum (OAM), liquid-crystal-on-siilicon spatial light modulators (LCoS-SLMs) and novel types of tunable reflective components are applied. Low-dispersion mirrors and spiral phase plates for few-cycle laser applications are developed and characterized. In proof-of-principle experiments, the application of angular tunable Fresnel mirrors to the adaptive autocorrelation and adaptive self-reconstruction was demonstrated. In analogy to well-known interferometric techniques, the capability of phase shift approaches to improve the resolution is studied. Specific transformations of propagating OAM pulses like spatial oscillations of spectral momenta, temporal aberrations or Guoy effect in sepctral domain are studied in detail. First experimental results were found to be consistent with numerical simulations and extend the classical theory of polychromatic vortex beams to singular light pulses with only few (sub-3) oscillations of the electromagnetic field amplitudes. 

Collaboration: Institute of Microsystem Technology (IMTEK), University Freiburg (Prof. Ulrike Wallrabe), FernUniversität Hagen (Prof. Jürgen Jahns), Metrolux, Göttingen (Dr. Carsten Fischer); DFG project: MAXWELL-2 (GR 1782/14-2, 2015-2018) with IMTEK 

Nonlinear spectroscopy of nanomaterials

Photoluminescence, Second Harmonic Generation (SHG), Third Harmonic Generation (THG) and Kerr effect of semiconductor nanolayers and nanorods (ZnO, TiO2) are studied with sub-3-cycle pulse excitation and single-photon spectroscopy (together with the group of PD Dr. Steinemeyer). 
Tailored hybrid nonlinear nanomaterials are used for plasmon management and localization. The ultrafast dynamics of femtosecond-laser plasmon excitation and nano-feedback processes are analyzed. Pump-probe diffraction experiments are performed with highly sensitive two-dimensional EMCCD detectors. Preliminary results yield essential contributions to the understanding of basic mechanisms of structural changes in materials which are still controversially discussed in literature. The creation of transient Drude metals via single and multiphoton excitation is investigated for semiconducting and dielectric materials (Si, ZnO, TiO2, SiO2).                                                

Collaboration: Dublin City University, Ireland (Prof. Enda McGlynn), University Barcelona, Spain (Prof. Frank Güell), FSU Jena (Dr. Wolfgang Seeber), KIT Bubaneshwar, India (Prof. Susanta Kumar Das) 



Curriculum vitae


            Professional career
  • since 1998 with Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Senior Scientist, Group Leader
  • 1993-1998 Light & Art GmbH, Managing Director, projects with polymer fibers and microoptics, collaboration with Lumenyte Corp., USA
  • 1991-1998 Society for the Promotion of Applied Optics, Optoelectronics, Quantum Electronics and Spectroscopy, Berlin, Leader of the Laboratory for Microoptics and Laser Beam Shaping, research projects in collaboration with MBI, small and medium enterprises and Siemens AG, Germany
  • 1986 PhD Thesis at HUB: Experimentelle Untersuchungen zur XeCl-Laser-induzierten stoßfreien UV-Mehrphotonendissoziation ausgewählter organischer und metallorgansicher Moleküle (Experimental investigations of the XeCl-laser induced collision-free UV multiphoton dissociation of selected organic and metal-organic molecules), Supervisor: Prof. Johannes Heinrich Hertz
  • 1982-1991 Central Institute for Optics and Spectroscopy, Academy of Sciences, Berlin
  • 1982 Diploma Thesis at HUB: Untersuchungen der spontanen Emission eines diffusen N2-Laser-Plasmas (Investigations of the spontaneous emission of a diffuse N2-laser plasma)
  • 1977-1982 Humboldt University Berlin (HUB), Study of Physics

Working visits abroad 

  • 2010 Visiting professor at University Barcelona, Spain
  • 2000, 2001, 2002, 2003, 2004, 2006 Laval University, Canada (Prof. Michel Piché) 
  • 2002, 2003 University of Toronto, Canada (Prof. Peter Herman)

Memberships

  • 2008 International Society for Optics and Photonics (SPIE)
  • 1997 European Optical Society (EOS)
  • 1995 Optical Society of America (OSA)
  • 1995 WISTA Solar, Founding member
  • 1990 Society for the Promotion of Applioed Optics, Optoelectronics, Quantum Electronics and Spectroscopy, Berlin (GOS), Founding member
  • 1981 German Physical Society (DPG)
          Awards, Honors
  • 2015 Senior Member, SPIE (The International Society for Optics and Photonics)
  • 2013 Outstanding Reviewer (Applied Surface Science, Elsevier)
  • 2012 Best Student's Paper Award (ISOT Conference, Paris)
  • 2011 Senior Member, OSA (The Optical Society of America)
  • 1982 Heinrich Gustav Magnus Award (Humboldt University, Berlin)
          International Advisory Boards
  • 2012-2015 Centre for Nonlinear Studies (CENS), Estonian Centre of Excellence in Research, Tallinn University of Technology (TUT)
          Program Committees and Editorial Boards
  • 2015 editor, scientific Reports (Nature Publishing Group)
  • 2011, 2012, 2013, 2014, 2015, 2016, 2017 SPIE Photonics West (Complex Light and Optical Forces)
  • 2011 IQEC/CLEO Pacific Rim (Information Optics, Optical Storage & Displays)
  • 2011 Workshop Nonlinear Nano-Optics (Organizer)
  • 2008 International Photonics Cluster, Summer School, Berlin

Recent Research Highlights

  • Adaptive autocorrelation and self-reconstruction of ultrashort pulses 
  • Spectral and temporal transformation of propagating few-cycle vortex pulses
  • Short wavelength tail effects in multiphoton induced luminescence from ZnO (with the group of Dr. Günter Steinmeyer)
  • Pump-probe diffraction and study of scatterer evolution in the initial phase of plasmon excitation
  • Generation of 60-nm structures in ultrathin metal foils by femtosecond laser induced plasmon excitation
  • Nanostructure-enhanced particle acceleration in strong laser fields (with the group of Dr. Matthias Schnürer)
Link to MBI Highlights

Publications


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Last changes: July 15, 2016