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Physics colloquium: Probing nanoscale thermal and acoustic dynamics at their intrinsic length- and time scales

This is a past event.

Friday, February 14 at 1:30pm to 2:30pm

AHC3 - Academic Health Center 3, 205
11200 SW 8th ST 33199, Academic Health Center 3, Miami, Florida 33199

Dr. Jorge Nicolás Hernández Charpak
Physics Department, STROBE Center, University of Colorado Boulder

Abstract: As the advancement of nanofabrication pushes the characteristic dimension of complex systems deep into the nanoscale regime, the need for reliable metrology tools at these length scales is crucial for both a fundamental description of novel emergent phenomena, nanoscale deviations from bulk behavior, and for many technological applications. Tabletop source of coherent extreme ultraviolet (EUV) light via high harmonic generation (HHG) provide an ideal probe for a variety of nanoscale dynamics with sub-15fs pulse duration and short wavelength. In this talk, I will present how we have used coherent HHG beams to measure thermal and mechanical properties of some of the smallest systems characterized to date, and how coherent diffractive imaging (CDI) techniques developed at the STROBE NSF STC are allowing us to fully reconstruct stroboscopic images of nanoscale dynamic. In particular, I will highlight how by probing thermal transport away from nanoscale heat sources we uncovered a surprising nanoscale energy transport situation where closed-packed nanoscale heat sources cool down faster than if farther apart.

Short Bio: Dr. Jorge Nicolás Hernández Charpak (Nico) is currently STROBE’s Associate Director of Research and Knowledge Transfer. STROBE is an NSF Science and Technology Center that aims to advance real-time functional imaging by advancing and combining different imaging modalities (structured illumination, super-resolution, X-ray, nano-probe, electron microscopy, among others). He focuses on connecting and coordinating the research across STROBE’s six different campuses, as well as on enhancing cutting edge imaging science and technology knowledge transfer to our STROBE’s trainees, the general public, and STROBE’s industry partners.  Nico received his B.S. in Physics and Computer Engineering from U. de los Andes (Bogota) in 2011 and his PhD in Physics from JILA and the University of Colorado Boulder in August 2017. Nico’s research focuses on the development of novel characterization tools and computational approaches to examine thermal and mechanical properties of nanostructured systems. In his “free” time he produces the LatinoLabs podcast and the Science for Democracy podcast project with CU Boulder young scientists.

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