Allison Research Group

Sergii Chernov is leaving us soon to start a new position at PETRA III. It was great to get the whole group together, with both new students and seasoned veterans, for an evening out.

In collaboration with the Liu group and the Laser Teaching Center at Stony Brook University, we will begin an exciting new five-year project to develop high-power frequency combs covering a wide swath of the electromagnetic spectrum, from the THz to the soft x-ray. The project is funded by the the Major Research Instrumentation (MRI) program of the National Science Foundation. The official announcement from NSF can be found here.

We have now posted a paper regarding our results from time-resolved ARPES studies in monolayer tungsten disulfide:

https://arxiv.org/abs/2203.02419

The momentum-space images recorded via time-of-flight momentum microscopy, like the one shown at left,  enable detailed examination of the momentum and energy dependence of coupling between exciton states across the Brillouin zone.

Graduate student Jin Bakalis won the prize for best poster at Chemistry Research Day with her poster titled: “Ultrafast Dynamics in Graphite/graphene probed with time-resolved momentum microscopy.” Here is a photo of Jin receiving the award from Dept. Chair Peter Tonge.

It has been a long brutal year, but things are starting to get a little bit more normal. We were actually all in the same place together today for the first time in over a year to take the group photo. Thanks to Eisen Gross for taking the picture.

Postdoc Grzegorz has been awarded a Marie Skłodowskiej-Curie fellowship from the European Commission. Congratulations!

A press release can be found HERE. The Stony Brook CE-TAS spectrometer is in the Polish news!

While non-perturbative high harmonic generation (HHG) has been a hot topic for decades, cascaded HHG is also a very rich problem and can have much higher efficiency. In collaboration with the Diddams group at NIST, we’ve investigated frequency comb generation via cascaded HHG in PPLN waveguides.  A recently submitted paper can be found here: https://arxiv.org/abs/2102.04670

After getting all the systematics under control, we have written a paper on our broadband cavity-enhanced transient absorption spectrometer. This takes CE-TAS from a one-of demonstration to a real chemical physics tool. The paper is available on the arXiv here: https://arxiv.org/abs/2102.04981

Grzegorz Kowzan has returned to our group now as a postdoc after completing is Ph. D. in Toruń. Welcome back!