Interns and HIWIs

We are looking for motivated students who would like to work with us on our ACCORD system. The students will work in a fancy laser lab. The works you are going to be involved in are listed as below:

Lab-heavy:

Programming-heavy:

To apply, please send a copy of your CV to:

Prof. Matthias Kling, email: matthias.kling@mpq.mpg.de

Max-Planck-Institute of Quantum Optics

Ludwig Maximilian University

Bachelor Thesis

Attosecond electron dynamics in molecule and related beamline development

The broad purpose of this scientific project is to investigate ultrafast electron dynamics in molecules through attosecond ionization time delay measurements and attosecond transient absorption spectroscopy. This uses attosecond XUV and soft X-ray pulses generated through higher harmonic generation by ultrashort IR laser pulses. To perform these we are in a process of developing a combined XUV and soft X-ray beamline.

The main work of the thesis will be to develop different mechanical diagnostics to be used in the beamline and related control software, particularly a six-degree of freedom movement stage for XUV-IR toroidal focusing mirror and related optimization of the focus size through LabView controlled software. We expect a strongly motivated candidate who has interest in experimental physics and programing language (backgrounds in gaussian optics and LabView are preferable). From this thesis work the candidate gets the opportunity to gain hands on experience of short pulse laser system, ultrashort pulse optics, attosecond physics experiments and advance level Labview programing. The candidate will work under the guidance of experienced researchers in the group.

Starting date: 1st August, 2018 or earlier.

If you are interested in this project, please contact:
Dr. Shubhadeep Biswas (office: B1.24, Max Planck Institute for Quantum Optics,  Hans-Kopfermann-Str. 1 D-85748 Garching, Germany)
shubhadeep.biswas@mpq.mpg.de
Office Phone: +49-(0)89-32905-684

Master thesis

Ultrafast electron dynamics in a single molecule

The purpose of the project is to investigate the optical response of a single molecule, such as C60, on a metallic nano-object using few-cycle laser pulses. Applying a strong DC electric field to a metallic nano-tip enables electron emission from its surface through quantum mechanical tunneling, which is termed as field emission. A single molecule on the tip apex can be observed via imaging the resulting field emission patterns. Illuminating such a nano-tip with a laser, electrons can be emitted from a single molecule, as schematically drawn in the figure below. With observing the laser-induced electron signal, we should be able to track the dynamics of a single molecule on the nano-tip. Also, we can investigate ultrafast electron dynamics in a single molecule by analysing the energy of the emitted electrons. These techniques will be used to create a single-molecule-based ultrafast quantum dot.

The main work of the thesis is to perform the laser-molecule/tip experiments described above with the system we setup already. Through the project, you will learn about ultrafast physics in a single molecule on a metallic nano-object as well as optics of few-cycle laser pulses. Equally important, working in a highly motivated team, you will be well supported during your thesis by Ph.D. students and postdocs.

If you are interested in this project, please contact:
Dr. Hirofumi Yanagisawa (office: w131, Am Coulombwall 1, 85748 Garching)
hirofumi.yanagisawa@mpq.mpg.de
Office Phone: 08928914110

Master thesis

Ultrafast electron dynamics in nano-objects

Electrons are particles, but they also behave like a wave. The electron waves are “coherently” extended in a metal on a scale of tens of femtoseconds and nanometers. Our main goals are to temporally and spatially control these coherent electron waves in nano-objects, and thus to sow the seeds for future ultrafast quantum devices.

During the last decade, we have been working on investigating laser-induced electron emission from a metallic tip with nanometer sharpness (we call it a nanotip). Applying strong DC fields on the nanotip drives electron emission from its apex, which is called a field emission. Since the emitted electrons are propagating radially, one can magnify nanoscopic information to the macroscopic scale, and display them on a two-dimensional detector. This field emission microscopy, as it’s called, is one of our main tools. Illuminating such a metallic nanotip with femtosecond laser pulses creates nano-sized optical electric fields at the tip apex, and induces ultrafast field emission from the apex. By varying the laser polarization with respect to the tip axis, the spatial distribution of the nano-optical fields on the tip apex can be changed, and subsequently their emission sites [1]. The animation shows an example of a laser-induced field emission from a tungsten nanotip in laser fields with rotating polarization. In effect, we can achieve an ultrafast pulsed coherent electron source with emission site selectivity on a scale of ten nanometers [1]. Using this technique, we can manipulate electron emissions within their coherence time and area, which then enables us to control coherent electron emission in time and space. In a demonstration, we realized optical control of Young’s electron interference [2]. The underlying electron dynamics is on a scale of femtoseconds. By using an electron energy analyzer, those electron dynamics in a tungsten tip have been revealed over a wide range of optical fields [3-5].

We would like to develop a technique for spatio-temporal optical control of coherent electron waves. At present, we are envisioning multiple projects. These projects are briefly listed below.

  1. Ultrafast electron dynamics in a low-dimensional nano-objects (Tukuba University)
  2. Optical control of coherent electron waves (Tokyo University)
  3. Optical control of quantum entanglement (Tokyo University)
  4. Development of an ultrafast spin switch (Hong Kong University of Sci. and Tech.)
  5. Development of atomic resolution field emission microscopy (NAIST)
  6. Ultrafast molecular dynamics (CERN and Helsinki University)

We also have active collaborations with researchers in multiple disciplines (shown in the round brackets) and can provide you opportunities to visit some foreign countries.

If you are interested in our projects and would like to hear more details, please contact:

Dr. Hirofumi Yanagisawa, DFG project leader,

(office: w132, Am Coulombwall 1, 85748 Garching)

hirofumi.yanagisawa@mpq.mpg.de

Office Phone: 08928914110

References:
[1] Hirofumi Yanagisawa et al., Phys. Rev. Lett. 103, 257603 (2009)

[2] Hirofumi Yanagisawa et al., Sci. Rep. 7:12661 (2017)

[3] Hirofumi Yanagisawa et al., Phys. Rev. Lett. 107, 087601 (2011)

[4] Hirofumi Yanagisawa et al., Sci. Rep. 6:35877 (2016)

[5] Hirofumi Yanagisawa et al., APL Photonics 1, 091305 (2016).

Master thesis

Ultrafast nanoplasmonics and microscopy

Ultrashort femtosecond laser pulses are able to generate the strongest electrical fields achievable today easily reaching the field strength binding electrons to atoms. The released electrons from nanomaterials in such fields can in turn be utilized as sensitive probes of the nanoscale electro-magnetic forces. Combining this approach with optical microscopy enables the probing of ultrafast nanoplasmonic dynamics in nanodevices, which show promise towards increasing the speed of electronics and becoming a key technology for ultrafast quantum computing.

Our team at the Laboratory for Attosecond Physics (LAP) at the Ludwig-Maximilians-Universität Munich and Max Planck Institute of Quantum Optics in Garching is currently looking for a motivated master student to join our research on ultrafast nanoplasmonics and microscopy. As part of the work, we are developing a novel ultrafast laser source with varialble repetition rates reaching up to   1 MHz and pulse durations of only a few cycles.

You will help with both the laser development and the nanoplasmonics experiments using our new ultrafast microscope. The project is embedded in our larger effort of pushing the frontiers of attosecond nanophysics. Synergies also exist with a project, where non-linear microscopy is applied on organic samples with the aim to develop imaging technology for the detection and treatment of early stages of cancer.

Experience in nonlinear optics, laser physics, strong field physics, attosecond physics, and medical physics can, depending on the project, be beneficial but are not required.

For more information, please visit our homepage at: http://www.attosecondimaging.de
If you are interested in joining our team, please contact: Prof. Dr. Matthias Kling,
E-mail: matthias.kling@lmu.de

 

Master thesis

Imaging ultrafast molecular dynamics

In our group, a variety of different light-induced strong field processes are studied for molecules and nano-objects using ultrashort laser pulses. For such studies, a laser system with few-cycle pulses (<5 fs) and high repetition rate (10 kHz) is used. By focusing the laser, intensities up to 1015 W/cm² are reached, which is sufficient to ionize molecules multiple times. We detect the time of flight and positions for both the ions and electrons providing us with complete momentum information for each particle. Using this method, different processes are addressed, as for example: Can UV excitation alter the reactivity of molecules on ultrashort time scales? How does the presence of a nanoparticle influence the dissociation behavior of molecules? Can we control which molecular bonds break by changing fundamental properties of the laser light?

As a master student in our group, you will learn the theoretical background of ultrafast physics and experience the daily life of experimental laser optics combined with vacuum techniques. The measurements are followed by statistical data evaluation using MatLab, Python and C++. Working in a highly motivated team, you will be well supported during your thesis by PhD students and postdocs.

If you are interested in this project, please contact:

Philipp Rupp (office: 205, Am Coulombwall 1, 85748 Garching)

philipp.rupp@mpq.mpg.de

089/289-14101