past events

Thursday 28. November 2013

MPL Distinguished Lecturer Series
From Extreme Nonlinear Optics to Ultrafast Atomic Physics

 

Speaker:

Prof Anne L'Huillier (Department of Physics, Lund University, Sweden)

Place:

MPL / large seminar room (*435)

Abstract:

The interaction of atoms with intense laser radiation leads to the generation of high-order harmonics of the laser field. In the time domain, this corresponds to a train of pulses in the extreme ultraviolet range and with attosecond duration. This presentation will introduce the physics of high-order harmonnic generation and attosecond pulses and describe recent developments including multicolor schemes or noncollinear geometries.
After the first decade where attosecond pulses were characterized, analyzed and used in –mostly– demonstration experiments, we begin to perform experiments where these pulses allow us to explore new physics. We will describe some of these applications, and in particular recent results concerning single and double photoioniza¬tion dynamics.

Thursday 31. October 2013

MPL Distinguished Lecturer Series

 

Speaker:

Prof Jérôme Faist (Quantum Optoelectronics Group, ETH Zurich, Switzerland)

Place:

MPL / large seminar room (*435)

Abstract:

The quantum cascade laser has demonstrated operation over an extremely wide wavelength range extending from the mid-infrared at 2.9?m to the Terahertz at 360?m. One very important feature of this device is its ability to provide gain over a very broad wavelength range. Recently, we have shown that such broadband devices, when operated in continuous wave, emit as a coherent optical comb1 in which the phase relation between the comb modes corresponds approximately to a FM modulated laser. These new comb lasers enables the fabrication of a dual comb spectrometer based on a quantum cascade laser that offers a broadband, all solid-state spectrometer with no moving parts and a ultrafast acquisition time.  We discuss also the extension of these ideas to the THz. 
1.    A. Hugi, G. Villares, S. Blaser, H. C. Liu and J. Faist, Nature 492 (7428), 229-233 (2012).

 

 

Thursday 24. October 2013

IMPRS get-together

 

Place: Physikalisches Institut (Erwin-Rommel-Str. 1)

Organisation: Thomas Gleixner (FAU / ECAP)

Talk: Chemically produced graphene

Speaker: Dr. Michael Enzelberger-Heim

Thursday 17. October 2013

MPL Distinguished Lecturer Series

Speaker:

Prof. Robert L. Byer (Applied Physics, Stanford University, USA)

Place:

MPL / large seminar room (*435)

Abstract:

The generation and control of light is critical for meeting important laser accelerator challenges of the 21st century. I review progress toward a laser-driven accelerator on-a-chip fabricated using modern lithographic tools. The laser accelerator is ideal for driving a dielectric-undulator FEL for table top MHz repetition rate attosecond X-ray lasers. Recent progress and issues that remain to be resolved are identified.

Wednesday 02. October 2013

IMPRS get-together

 

Place: MPL (Lecture room 435, Bldg 24, Günther-Scharowsky-Str.1)

Organisation: Angela Pérez (MPL & FAU / Leuchs Division)

Talk: Higher quantum dimensionality by exploiting the photonic orbital angular momentum

Speaker: Fabio Sciarrino (Dipartimento di Fisica dell’Università “La Sapienza”, Roma 00185, Italy)

Abstract:

In quantum information processing based on optical techniques, single photons offer   a   variety   of  degrees of freedom in which information can be encoded.  By exploiting these resources, it  is  possible  to implement high-dimensional quantum states,  or qudits,  which enable higher security in quantum cryptographic protocols, as well as implications in fundamental quantum mechanics theory.   In the last few years, many improvements have been achieved for qudit states with d = 3 (qutrits) and d = 4 (ququarts). In  this  framework,  the  orbital  angular  momentum of  photons,  being  de?ned  in  an  in?nitely  dimensional Hilbert  space,  offers  a  promising  resource  for  high-dimensional optical quantum information protocols. Recently we introduced and tested experimentally a series of optical schemes for the coherent transfer of quantum information from the polarization to the orbital angular momentum (OAM) of single photons and vice versa [1,2,3].  All our schemes exploit a newly developed optical device, the so-called “q-plate”, a suitably patterned non-uniform birefringent plate, which enables the manipulation of the photon orbital angular momentum driven by the polarization degree of freedom.  Our experiments prove that these schemes are reliable, efficient and have a high ?delity. First we will present the experimental generation and manipulation of a hybrid ququart encoded in the polarization and orbital angular momentum of a single photon [4,5,8].
Hence we will discuss potential applications for quantum communication. For two or more parties to execute even the simplest quantum transmission, they must establish, and maintain, a shared reference frame. This introduces a considerable overhead in communication resources, particularly if the parties are in motion or rotating relative to each other. We experimentally demonstrate how to circumvent this problem with the efficient transmission of quantum information encoded in rotationally invariant states of single photons obtained by combining together the polarization and OAM degrees of freedom [6]. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform a proof-of-principle alignment-free entanglement distribution and violation of a Bell inequality [6]. Finally we will report the demonstration of NOON-like photonic states of m quanta of angular momentum up to m=100, in a setup that acts as a ‘photonic gear’, converting, for each photon, a mechanical rotation of an angle into an amplified rotation of the optical polarization by a factor m, corresponding to a ‘super-resolving’ Malus’ law [7]. We show that this effect leads to single-photon angular measurements with the same precision of polarization-only quantum strategies with m photons, but robust to photon losses. Moreover, we combine the gear effect with the quantum enhancement due to entanglement, thus exploiting the advantages of both approaches. The high ‘gear ratio’ m boosts the current state of the art of optical non-contact angular measurements by almost two orders of magnitude [7].

 

References

[1]    E. Nagali,  F. Sciarrino,  F. De Martini,  L. Marrucci,  B. Piccirillo, E. Karimi, and E. Santamato, Phys. Rev. Lett.     103, 013601 (2009).

[2]    E. Nagali, L. Sansoni, F. Sciarrino, F. De Martini, L. Marrucci, B. Piccirillo, E. Karimi, E. Santamato, Nature Photonics 3, 720 (2009).

[3]    E. Nagali, and F. Sciarrino, Optics Express 18, 18243 (2010).

[4]    E. Nagali, L. Sansoni, L. Marrucci, E. Santamato, F. Sciarrino, Phys. Rev. A 81, 052317 (2010).

[5]    E. Nagali, D. Giovannini, L. Marrucci, S. Slussarenko, E. Santamato, and F. Sciarrino, Phys. Rev. Lett. 105, 073602 (2010).

[6] V. D'Ambrosio, et al., Nat. Commun. 3, 961 (2012).

[7] V. D'Ambrosio, et al., Nat. Commun. in press (2013).

[8] V. D'Ambrosio, I. Herbauts, E. Amselem, E. Nagali, M. Bourennane, F. Sciarrino, A. Cabello, Phys. Rev. X 3, 011012 (2013).

Sunday 22. September 2013

Visions in Science - Shaping the Future

 

Place: MPI-CBG, Dresden

More information: http://www.visions-in-science.org/

Monday 16. September 2013

IMPRS annual meeting

 

This year’s invited talks and block lectures feature cutting-edge research in: quantum optics, optical trapping, advanced imaging, optomechanics, and nanophotonics:

 

Invited speakers

Arno Rauschenbeutel (Vienna University of Technology)

Title: ‘Nanofiber Photonics and Quantum Optics’

 

Alexander Rohrbach (University of Freiburg)

Title: ‘Optical particle trapping and tracking: Principles and applications’

 

Allard Mosk (University of Twente)

Title: ‘Imaging and focusing through strongly scattering layers’

This talk is part of an exchange with the Twente Graduate school: Advanced Optics

 

Oskar Painter (Max Planck Institute for the Science of Light)

Title: ‘Quantum cavity-optomechanics’

 

Block lectures

Ulf Peschel (Friedrich-Alexander University Erlangen)

Title: ‘On the manipulation of optical pulses in fiber systems’

 

Maria Chekhova (Max Planck Institute for the Science of Light)

Title: ‘From entangled photon pairs to bright entangled beams’

 

Other activities include:
Student talks, Panel discussion, Poster session

 

Location:
Tagungshotel Behringers (near Gößweinstein) 

 

More information: FlyerProgramme

 

 

Sunday 08. September 2013

FRINGE 2013 - 7. International Workshop on Advanced Optical Imaging & Metrology

 

Organisation: ITO – Institut für Technische Optik

Place: Nuertingen (near Stuttgart)

More information: www.fringe13.de

 

Thursday 25. July 2013

IMPRS get-together

 

Place: optics seminar room 01.779 at the physics department building in Staudtstraße 7

Organisation: Robert Buschlinger (MPL & FAU / Leuchs Division)

Talk: Semiconductor Nanowire Photonics

Speaker: Robert Röder (Friedrich-Schiller-University Jena)

Abstract:

The forthcoming limitations of conventional electronic integrated circuits promote reinforced work in nanophotonics to overcome the drawbacks of electrical interconnects by on-chip optical data processing and transmission. Semiconductor nanowires are promising building blocks for on-chip optoelectronic components, as they are functional and connecting units in both electronics and photonics: They offer highly localized light emission and mark, due to efficient waveguiding, the lower physical size limit of multimode photonic laser systems. Thus, semiconductor nanowires are ideal nanoscale light sources for optical data transmission and processing in a spectral range that is typically determined either by the direct band gap of the material or by optical impurities. In this talk I will cover mainly 2 topics: The green CdS nanowire laser and different approaches to modify its lasing properties. I’m furthermore going to sketch a route to a ZnO nanowire impurity waveguide and resonator.

Thursday 18. July 2013

IMPRS get-together

 

Place: MPL (Large seminar room *435)

Organisation: Sebastian Bauerschmidt (MPL / Russell Division)

Talk: Whispering gallery mode resonators: linear and non-linear optics from the visible to THz

Speaker: Harald Schwefel (MPL / WhiGaMoR group)

Abstract:

Even the best non-linear optical materials require intense optical fields to utilize their non-linearity. Monolithic optical resonators are the ideal platform to provide these high intensities as well as long interaction regions, with moderate input powers. Some of the best optical resonators with a small footprint are whispering gallery mode (WGM) resonators. Their principle is based on continued total internal reflection at the interface of a convex dielectric. In this talk I will provide the basics of optical resonators with emphasis resonators of the WGM type and give an overview of recent applications of such resonators.