past events

Wednesday 06. June 2018

LECTURE ANNOUNCEMENT
Monolithically Integrated 3D Silicon Photonic Platforms

 

Organisation: Max Planck Institute for the Science of Light / Russell Division

Speaker: Prof Joyce Poon (Department of Electrical and Computer Engineering, University of Toronto, Canada)

Place: MPL / seminar room (1.500)

Abstract:

This talk presents my group’s progress in foundry-compatible, monolithically integrated multilayer silicon nitride-on-silicon (SiN-on-Si) photonic platforms.  These SiN-on-Si photonic platforms contain several waveguide levels, and light can be routed vertically between the layers to realize 3D photonic devices and circuits.  I will present our work on passive and active elements, including ultra-low-loss waveguide crossings, multi-layer grating couplers, polarization management components, and ultra-efficient Si depletion modulators.  These advancements make possible the implementation of very large-scale photonic circuits for applications such as optical switching, phased arrays, and dense sensor systems.

 

Monday 28. May 2018

MPL Alumni Seminar
How to leap from academia into industry successfully?

 

Organisation: The hBar Omega Student Chapter

Alumni: Dr. Bettina Heim (Optical AIT Engineer at OHB System AG) and Dr. Benjamin Sprenger (Sales Engineer at Menlo Systems)

Place: MPL / seminar room 1.500

Topic:

When making the transition from the world of academic research to industry many questions arise:

How should I approach possible employers? How do I use my professional network most efficiently when searching for a job? 

How can I present myself and my skills in the best light? How does the working life in industry looks like? 

 

 

Thursday 24. May 2018

IMPRS monthly meeting - CHANGED DATE!

 

Organisation: Gaetano Frascella (MPL/ Russell Division)

Talk: Quantum sensing beyond limits

Speaker: Prof. Ulrik Andersen (Technical University of Denmark)

Place: MPL / library 2.500

Abstract:

What is quantum sensing? Is entanglement or squeezing needed? These are questions that I will touch upon in my talk. In addition, I will present new results on distributed sensing and teleportation based sensing.

 

 

Friday 11. May 2018

MPL Distinguished Lecturer Series
Quantum Effects in the Motion of Surprisingly Large Objects

 

Talk by: Prof. Jack Harris (Yale University)

Place: MPL, seminar room 1.500

Abstract:

The theory of quantum mechanics is believed to describe nearly all physical phenomena. It is embedded in our understanding of the universe and much of the technology that enables modern society. At the same time, some features of quantum mechanics strongly contradict physical intuition. These features (such as entanglement, measurement back-action, and zero-point energy) are routinely observed in the behavior of very small objects. Their seeming absence in large objects can be understood within quantum theory, but still raises questions: Are there limits to the size of an object that can exhibit quantum effects? If so, what can we learn from these limits? If not, what new technology might be enabled by macroscopic quantum phenomena? In this talk I will discuss these questions from the perspective of the field known as “quantum optomechanics”, and will describe my lab’s experiments on quantum effects in the motion of millimeter-sized objects.

Wednesday 09. May 2018

LECTURE ANNOUNCEMENT
Topological physics with coupled oscillators: beyond Berry's phase via exceptional points

 

Organisation: Max Planck Institute for the Science of Light / Marquardt Division

Speaker: Jack Harris (Yale University)

Place: MPL / seminar room (1.500)

Abstract:

A system that consists of a small number of linearly coupled, classical simple harmonic oscillators is often considered to be trivial. Thus it was remarkable when Berry and others showed that the phases of such oscillators possess robust geometric and topological features. More recently it has been appreciated that introducing dissipation into such a system opens an entirely new form of topological control. This "non-Hermitian" control has a novel feature: it can operate on the oscillators' energy (rather than their phase). In this talk I will describe how it is that dissipation (which is usually a disadvantage) results in a qualitatively new form of topological control. I will also describe the realization of these effects in a simple optomechanical system.

 

 

Wednesday 09. May 2018

LECTURE ANNOUNCEMENT
Designing optical and optoelectronic responses in materials

 

Organisation: Max Planck Institute for the Science of Light / Leuchs Division

Speaker: Prof. Andrew M. Rappe (University of Pennsylvania, USA)

Place: MPL / library (2.500)

Abstract:

Next-generation optical and optically-enabled information technologies rely on the cultivation of a new generation of materials that offer excitations that can be manipulated with light. In this talk, I will discuss materials with dramatically tunable optical (linear and nonlinear) and optoelectronic responses that depend sensitively on light frequency, optical polarization, and propagation direction. Electronic topological band theory and response function analysis point to new functional optical and optoelectronic opportunities.

 

 

Thursday 03. May 2018

MPL Distinguished Lecturer Series
Quantum Internet: Vision or Fiction

 

Talk by: Prof. Gerhard Rempe (Max Planck Institute of Quantum Optics, Garching)

Place: MPL, Seminar room 1.500

Abstract:

Quantum physics allows for applications not possible within classical physics. A prominent example is the quantum computer that, once realized, needs a quantum environment for communication – a quantum internet. The talk will discuss elementary steps with novel protocols towards quantum computation and quantum communication by means of single photons that propagate between quantum memories made of single atoms in optical resonators.

 

Wednesday 02. May 2018

IMPRS monthly meeting

 

Organisation: Jonas Hammer (MPL/ Russell Division)

Talk: Reconfigurable optical implementation of quantum complex networks

Speaker: Prof. Valentina Parigi (Laboratoire Kastler Brossel, Paris)

Place: MPL / library 2.500

Abstract:

We propose an experimental procedure for the optical implementation of quantum complex networks [1]. The implementation of collections of systems arranged in a network structure with arbitrary complex topologies is still a non-trivial task in quantum experiments. We devise a mapping between complex networks and non-linear optical processes pumped by optical frequency combs followed by mode-selective detection. We show the deterministic implementation of reconfigurable networks. The platform has the potential to enable the experimental study of, e.g., the dynamics of quantum states in complex networks and topological effects in quantum communication or information protocols over complex entanglement networks.

[1] J. Nokkala, F. Arzani, F. Galve, R. Zambrini, S. Maniscalco, J. Piilo, N. Treps, and V. Parigi, New Journal of Physics (2018)
http://iopscience.iop.org/10.1088/1367-2630/aabc77

Thursday 19. April 2018

LECTURE ANNOUNCEMENT
Microfabrication technologies for biological and biophysical applications

 

Organisation: Max Planck Institute for the Science of Light / Sandoghdar Division

Speaker: Dr. Salvatore Girardo (TU Dresden, Microstructure Facility)

Place: MPL / library (2.500)

Abstract:

The development of microfabrication technologies, initially used for the fabrication of electronic circuits, has become a major focus among biological sciences, leading to the development of various miniaturized devices able to reproduce physiological environments for the in vitro study of biological systems. The usefulness of microfabricated tools for probing biological systems at different length scales (from molecular to organism scale) has been widely demonstrated, and their integration with biophysical instruments provides scientist with powerful technologies to deal with specific biological questions. During my talk, I will showcase the capabilities of our Microstructure Facility, where different materials and technologies are employed to realize microstructures and microfluidic devices which are rationally designed for specific biological and biophysical applications.

 

 

Wednesday 18. April 2018

LECTURE ANNOUNCEMENT
Fabrication of perfect ultra-long fiber Bragg gratings for high-performance Raman fiber lasers

 

Organisation: Max Planck Institute for the Science of Light / Russell Division

Speaker: Sébastien Loranger, Ph. D. (Advanced Photonic Concept Laboratory, Ecole Polytechnique de Montréal, Canada)

Place: MPL / seminar room (1.500)

Abstract:

Distributed feedback (DFB) fiber laser constructed around a phase-shifted fiber Bragg grating (FBG) can achieve outstanding performance in terms of single-frequency operation with linewidth in the kHz range. Using Raman gain as pumping mechanism allows such laser to be operated in any band, including those where rare-earth cannot reach. However, due to the low Raman gain, ultra-long FBGs in highly non-linear small-core fiber must be fabricated for operation at modest pump powers (~ 1 W or less). Such gratings were, until recently, impossible to fabricate with reproducibility due to non-uniformity in specialty fibers. Ultra-long FBGs are typically defined as gratings of lengths longer than typical phase mask, hence >20 cm long. We have recently demonstrated a technique which involves a fiber characterization prior to fabrication, and thus allows for the inscription of perfect ultra-long FBGs in any imperfect fiber. The technique will be presented as well as its results. This fabrication technique has allowed for the extensive study and optimisation of Raman DFB fiber laser. The limitations (mostly thermal gradient along the fiber) were identified and understood and outstanding performance was demonstrated (350 mW pump threshold).