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.
Using the multi-comb ideas presented in our previous paper on cavity-enhanced 2DIR spectroscopy, and major recent advances in mid-IR and long-wave IR frequency combs, high-resolution 2DIR spectroscopy of gasses is poised to become a powerful method for multi-species trace gas analysis. In two articles posted today, we present a comprehensive theoretical treatment of rotationally-resolved 2DIR (RR2DIR) spectroscopy and several new polarization conditions that can be used to bring clarity to RR2DIR spectra.
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!
Usually, we update the group photo every Spring. Due to the COVID-19 pandemic, we now all work remotely. So our latest group photo is a screenshot of a Zoom meeting…
All are doing OK so far, with many projects to work on remotely. We remain motivated by our basic science goals, realizing that basic science, including the development of tools to image the microscopic, underlies underlies much of our modern-day scientific framework for understanding the novel coronavirus.
Group Photo 2020
