past events

Thursday 04. May 2017

IMPRS monthly meeting


Organisation: Yazgan Tuna, (MPL /Sandoghdar Division)

Talk: Collective Behaviour of Cells in Dense Tissues

Speaker: Özer Duman, Forschungszentrum Jülich, Germany

Place: Bibliothek A.2.500, MPL, Staudtstr.2, 91058 Erlangen

Date & Time: Thursday , 04 May 2017, 15:00 h


Biological tissues show different phases of motility, generally described as nonmotile, jammed, and fluid-like phases. The different phases support particular functions. In wound healing, cells move collectively to close a wound. In tumors, cells evolve into a motile phenotype, during cancer metastasis. In in-vitro experiments, cell-cell contacts mature, leading to a glass-like arrest of the previously fluid-like tissue. For motile tissues, we distinguish generally an ordered and jammed solid-like phase and a disordered and migratory fluid-like phase. We develop a novel computational model of tissues wherein individual cells are extended objects with well defined physical properties. The model reproduces the solid-to-fluid and the reverse transition as a function of physical parameters. In particular, we find that cell-cell adhesion favours a solid-like phase, while motility and deformability lead to more fluid like structures.

[1] N. Podewitz, F. Jülicher, G. Gompper, J. Elgeti, New J. Phys. 18 083020 (2016)

[2] N. Podewitz, M. Delarue, J. Elgeti, EPL 109 58005 (2015)

[3] S. Garcia, E. Hannezo, J. Elgeti, J-F. Joanny, P. Silberzan, N. Gov, PNAS 112 15314 (2015)

[4] M. Basan, J. Elgeti, E. Hannezo, W-J. Rappel, H. Levine, PNAS 110 2452 (2012)



Thursday 30. March 2017

Two-day Scientific Writing Workshop


Instructors: Justin Mullins & Mark Buchanan, WAS (Write About Science), London

Venue: Bibliothek A.2.500, MPL, Staudtstr.2, 91058 Erlangen

Date & Time: Thursday & Friday, 30-31 March 2017, 09:00-17:00 h

Attendance: IMPRS-PL students

Course description: 

The Scientific Writing Workshop teaches the skills for producing high quality papers. A main focus of the course is the structure of good communication. So the workshop includes sessions on the structure of sentences, of paragraphs, abstracts and entire papers.We also explain how journals choose the papers they publish, we discuss editing, group editing and graphics. We have a wide range of thought-provoking exercises to emphasise the learning objectives and to allow students to practice the competences we teach. One of the most valuable aspects of the course is the one-to-one feedback we give to each participant. Ahead of the workshop, we ask each attendee to write an abstract about their work. We then prepare detailed line-by-line feedback that we give to each student during the second day.






Friday 17. February 2017

IMPRS monthly meeting


Organisation: Golnoush Shafiee, (MPL /Leuchs Division)

Talk: Narrowband Quantum Light Sources for Quantum Memories

Speaker: Professor Hugues de Riedmatten, ICFO-The Institute of Photonic Sciences, Barcelona, Spain

Place: Bibliothek A.2.500, MPL, Staudtstr.2, 91058 Erlangen

Date & Time: Friday, 17 February 2017, 11:00 h


Photonic quantum memories are important devices in quantum information science as they provide a quantum interface between flying and stationary qubits. The ability to store a quantum state of light enables the synchronization of different probabilistic quantum processes, which in turns allows the realization of scalable quantum networks and quantum repeaters. The realization of photonic quantum memories require strong interactions between photons and matter, which puts stringent requirements on the spectral properties of the photons to be stored.

In this talk, I will describe two approaches to generate storable single photons compatible with quantum memories based on rare-earth doped solids and laser cooled rubidium atoms.  The first approach is based on the generation of narrowband non-degenerate photon pairs compatible with solid-state quantum memories and telecom fibers, using cavity enhanced spontaneous down-conversion. This approach recently led to the first demonstration of quantum correlations between a telecom photon a multimode spin-wave solid-state quantum memory. The second approach involves the realization of a photon pair source with embedded quantum memory, using spontaneous Raman scattering in ensembles of atoms. A recent experiment demonstrating the generation of narrowband and synchronizable single photons with highly tunable wave shape from a cold atomic ensemble of Rubidium atoms will be described, as well as the first demonstration of a solid-state photon pair source with embedded multimode memory.

Wednesday 01. February 2017

IMPRS monthly meeting


Organisation: Ankan Bag, (MPL /Leuchs Division)

Talk: Zero-Index Materials

Speaker: Dr. Sergey Nechayev, Interference Microscopy Group (Leuchs Division), MPL, Erlangen

Place: Light Lounge A.3.500, MPL, Staudtstr.2, 91058 Erlangen

Date & Time: Wednesday, 1 February 2017, 14:00 h


Light propagation in a material with effective refractive index near zero. The unique properties of such wave include: directional emission from zero-index material, "electrostatic" space field distribution of a propagating wave, dramatic field enhancement, applications to optical cloaking, lensing and sensing.

Monday 19. December 2016

IMPRS monthly meeting (+ Christmas get-together)


Organisation: Sivaraman Subramanian (MPL /Frank Vollmer Group)

Talk: Engineered deterministic Si nanostructures from sculptured light patterns for integrated photonic applications

Speaker: Dr. Jolly Xavier, Vollmer Group, MPL, Erlangen

Place: Bibliothek A.2.500, MPL, Staudtstr.2, 91058 Erlangen

Date & Time: Monday, 19 December 2016, 16:00 h


Exotic manipulation of the flow of photons in nanoengineered materials with a tailored distribution of nanostructures plays a key role in efficiency-enhanced broadband photonic and plasmonic technologies. New generation integrated photonic applications look forward to engineered deterministic nanostructures which can be precisely designed, fabricated and integrated into device blocks in a controlled manner. Here we explore in particular the seemingly counter intuitive impact of order as well as disorder of aperiodic nanostructures in achieving tailorable optical properties of nanostructured materials for broadband integrated photonic applications. The realized nanophotonic lattices are designed through sculptured light patterns having easily tailorable supercell tiles with well- defined and discrete lattice basis elements showing rich Fourier spectra. Through a generic deterministic nanotechnological route the subwavelength-scale silicon nanostructures are realized on nanoimprinted glass substrate in large area with advanced functional features.

Thursday 24. November 2016

IMPRS monthly meeting


Organisation: Veronika Ludwig (FAU/ Erlangen Centre for Astroparticle Physics / Group of Gisela Anton)

Lab Tour: X-ray phase contrast imaging set-ups

Place: ECAP / Physikalisches Institut, Erwin Rommel Str. 1, main entrance 

Speaker: Dr. Thomas Weber, Project Manager at Siemens Healthineers' Business Line Components and Vacuum

Date & Time: Thursday, 24 November 2016, 17:00 h


The lab tour focuses on the different X-ray phase contrast imaging set-ups of the Radiation Physics Group at the Erlangen Centre for Astroparticle Physics and on the single components of an X-ray Talbot-Lau interferometer. In addition some details about the fabrication of the used gratings are given. Furthermore there will be a short introduction in another approach of phase contrast imaging by a single shot method and an insight in the typical process of image acquisition by the common phase stepping method is provided. Finally a few samples and results for non-destructive materials testing as well as for medical applications are shown.


Dr. Thomas Weber studied physics with focus on "Physics Methods and Applications in Medicine” until 2010. In 2009/2010 he wrote his diploma thesis and then his PhD (until 2013) both in the X-ray phase contrast imaging working group of Prof. Dr. Gisela Anton at ECAP. After that Thomas Weber continued his work on X-ray phase contrast imaging as PostDoc and group leader. Since May 2015 he works as innovation project manager at Siemens Healthineers’ Business Line Components and Vacuum with focus on X-ray generation and new imaging methods.

Thursday 27. October 2016

IMPRS monthly meeting


Organisation: Steffen Hallmann (FAU/ Erlangen Centre for Astroparticle Physics / Group of Gisela Anton)

Lab Tour: Detector components for KM3NeT and CTA

Place: ECAP / Physikalisches Institut, Erwin Rommel Str. 1, main entrance 

Date & Time: Thursday, 27.10.2016, 16:00 h


The Erlangen Centre for Astroparticle Physics (ECAP) participates in major projects in the field of astroparticle physics. The tour will focus on the development, integration and testing of detector hardware at ECAP for two next-generation research infrastructures: It will give an insight in the fabrication of digital optical modules for the KM3NeT detector, a km3-size neutrino telescope in the deep sea, and in the flash-cam concept for CTA, an array of Cherenkov telescopes for very-high-energy gamma-ray astronomy.

Monday 26. September 2016

IMPRS annual meeting 2016


Place: Tagungshotel Behringers, Gößweinstein

Invited talks: Pierre Berini, Sonja Franke-Arnold, Romain Quidant, Tomas Cizmar

Block lectures: Philip Russell, Norbert Lindlein

Other: panel discussion, poster session, student talks

For more information: flyer and programme will follow

Monday 18. July 2016

IMPRS monthly meeting


Organisation: Wenbin He (MPL/ Russell Division)

Talk: Paradoxical dynamics in ultrafast fiber lasers

Speaker: Prof. Philippe Grelu (Université de Bourgogne, Dijon, France)

Place: MPL / Large seminar room (*429/435)


During this presentation, I shall highlight the diversity of ultrafast dynamics accessible in fiber laser setups that use rather standard fiber and integrated optical components. In a broad range of observations, fiber laser dynamics are shaking the conventional view relating ultrafast dynamics and laser mode locking. Examples include pulse generation in normally-dispersive cavities, multiple-pulse collective dynamics and noise-like pulse emission. I shall present the dissipative soliton concept, which allows developing significant insight around these complex dynamics.

Thursday 14. July 2016

IMPRS monthly meeting


Organisation: Daqing Wang (MPL/ Sandoghdar Division)

Talk: Near-field microscopy gone rogue

Speaker: Dr Nir Rotenberg (Sandoghdar Division, MPL)

Place: MPL / Large seminar room (*429/435)


There are many natural phenomena such as polarization singularities or tsunamis that have optical analogues at the nanoscale.  These phenomena can often be created, and even controlled, by nanophotonic structures.  Studying these light fields, which requires the ability to view them at distances of 10’s of nanometers from their associated system, is far from trivial.  The rewards, however, make these studies well worth the effort. 

Near-field optical microscopy allows us to image nanoscale light-matter interactions, and I will discuss one of its prevalent tools: the aperture based, near-field scanning optical microscope (NSOM).  I will show that, although this technique has been present for several decades, we are only now unlocking its full potential.  Specifically, we have recently learned that aperture NSOMs are sensitive not only to electric near fields but also to the magnetic component of light.  Finally, I will discuss a recent near-field measurement where we study the evolution of light field inside chaotic photonic crystal resonators.  There we see the spatio-temporal generation of optical rogue waves – nanoscopic photonic tsunamis – on a chip.