Transient nanoscale thermal imaging and heat transport
Seminar
- Datum: 18.09.2023
- Uhrzeit: 14:00 - 15:15
- Vortragender: Prof. Ali Shakouri
- Birck Nanotechnology Center, Purdue University
- Ort: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle (Saale)
- Raum: Lecture Hall, B.1.11

Heating is a major bottleneck limiting the performance of
electronic and optoelectronic integrated circuits. We describe
full-field thermoreflectance thermal imaging to characterize localized
heating with sub micron spatial, 800ps time and 10mK temperature
resolutions. Results are presented for active devices such as GaN high
electron mobility transistors, 3D heterogeneously integrated devices,
photonics integrated circuits, memristors and heat assisted magnetic
recording heads. Applying this technique to nanoscale
heat sources, we show breakdown of Fourier diffusion equation.
Experimental evidence for fractal Levy phonon random walk and
hydrodynamic heat transport in semiconductors at room temperature will
be presented. We will also describe methods based on image deblurring
to obtain far field temperature resolution down to 100nm range as well
as quantum illumination to increase the temperature resolution below
shot noise.