In this page you would find about several of our recent and ongoing research efforts. For prospective research students with little background it is recommended to also read our intro page .
We study interactions between light and atoms when the light is strong enough to split the wave-function of an electron in the atom and drive it far from the atom. Such a process can lead to the emission of ligt which is unique for having ultrashort durations and nanometer wavelengths. Particular interest is given in our group to control the emission by manipulating the electronic wave function of the electron in the atom as well as by manipulating the relations of the emission between many different atoms in the medium.
Normally light emitted by a laser propagates in a straight line at a fixed velocity. We study ways to bend and thus accelerate light either in space or in space-time. The first case creates bending beams of ligt, that do no propagate along a straight line.
The second case creates light with a changing velocity. We then consider applications with such unique light fields, for example moving particles along curved trajectories, time-reversing the envelope of other light-pulses and studying the time-dynamics of electronic motion within atoms.
With the rise of deep learning networks in science in general we study the application of deep learning to solve challenging and intriguing problems in optics, from classifying light beams according to their angular momentum to manipulating nonlinear processes in which
light in one wavelength is creating light at other wavelengths.
We study possible applications for mathematical functions with uniqe properties. For example we use functions which are band-limited (their Fourier composition has a Fourier component with a maximal frequency)
yet they exhibit arbitrarily fast oscillations to achieve extreme focusing of light beams (focusing in space) and of light pulses (focusing in time). Another example is a use of a function which is made of a super-position of oscillating fields yet along some stretches can hardly change as if it contains a zero-frequency field. We used such a function
to demonstrate an anomalous rapid expansion of a light beam.