past events

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. 





Thursday 30. June 2016

IMPRS monthly meeting


Organisation: Luo Qi (MPL/ Chekhova Research Group)

Talk: Efficient coupling of light and a single two level atom in free space

Speaker: Dr. Bharath Srivathsan (MPL / Leuchs Division)

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


The interaction of light with a single atom is among one of the most fundamental problems in quantum optics. A great number of effects has been studied and many applications utilizing the interaction of a light field with single atoms have been successfully demonstrated. Nevertheless the efficiency of such an interaction in free space has been quite small in general. In this talk I will present a way to achieve a near perfect coupling in free space using a parabolic mirror with a two level atom at its focus. I will further discuss some of our recent results on characterizing the coupling efficiency of light to a single trapped 174Yb+ ion.

Thursday 16. June 2016

IMPRS monthly meeting


Organisation: Roland Lauter (FAU/ Institute for Theoretical Physics II)

Talk: Phase Transitions and Spontaneous Symmetry Breaking in Open Quantum Systems

Speaker: Dr Carlos Navarrete-Benlloch (Institute for Theoretical Physics II, FAU)

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


Closed systems, fully described by a Hamiltonian, undergo a phase transition when the ground-state expectation value of some observable shows a sudden change of behaviour as a system parameter is varied. For systems with some intrinsic symmetry, such a “critical point” usually separates two very distinct phases: one with a unique ground state that preserves the symmetry, and another where the system presents several degenerate ground states which are connected by the symmetry transformation. In the second phase, the process by which the system chooses one of the ground states is consequently known as “spontaneous symmetry breaking”, and many interesting physical phenomena are derived from it (most prominently the Higgs mechanism of the Standard Model of particle physics).

While phase transitions are well understood in closed systems, the situation is rather different in open systems, that is, systems in contact with an environment to which they loose energy and information. For any value of its parameters, dissipation usually drives the system into a unique equilibrium state, and hence, one may think that phase transitions and, especially, spontaneous symmetry breaking play little role on such scenario, if any. Through the simple (but significant) example of degenerate parametric oscillation, a paradigmatic quantum-optical dissipative model containing a discrete symmetry, in this talk I will try to convince you that the situation is much more subtle than it looks, and indeed phase transitions and spontaneous symmetry breaking provide valuable and deep insight into the physics of open quantum systems.

Apart from introducing the topic from a general point of view, I will briefly discuss different modern quantum-optical technologies where the physics of dissipative phase transitions and spontaneous symmetry breaking play a major role. Most of my current work is focused on such technologies which include, e.g., nonlinear optics, opto- and electro-mechanical devices, cold atoms, and superconducting circuits.