MRI Development Grant

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.

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Rotationally-resolved 2DIR spectroscopy

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.

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Momentum-Resolved Exciton Coupling in Monolayer WS2

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.

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Jin Bakalis Wins Poster Prize!

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.

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Allison Group Re-united

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.

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Grzegorz wins Marie Skłodowskiej-Curie Fellowship

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!

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HHG in PPLN waveguides

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

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Broadband cavity-enhanced ultrafast spectroscopy

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

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Grzegorz Returns

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

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Graduate Student Positions Available

With recent/upcoming graduations, we have several projects available for graduate students to do research in the Allison lab. Please contact Tom Allison if interested.

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