[institut] Laboratory for Photoacoustics Seminar Phonon-Polariton Thermal Waves by Jose Ordonez-Miranda 14. 11. 2025. at 11:00

[Dr. Dragan D. Markushev]

Dear colleagues,

You are kindly invited to the Laboratory for Photoacoustics seminar, 
which will be held on Friday, 14. 11. 2025. at 11:00, in the "Dragan 
Popović" lecture hall of the Institute of Physics Belgrade. The talk 
entitled:

Phonon-Polariton Thermal Waves

will be given by Jose Ordonez-Miranda, Sorbonne Université, CNRS, 
Institut des Nanosciences de Paris, INSP, Paris, France

The abstract of the talk:

Based on the Boltzmann transport equation, we derive and analyze 
analytical expressions for the temperature and heat flux profiles of 
thermal waves propagating along nanofilms supporting the propagation of 
phonons and polaritons. In contrast to the typical temperature amplitude 
decreasing monotonically as the modulation frequency increases, we show 
that the amplitude of the phonon-polariton temperature field exhibits a 
peak whose intensity and frequency of occurrence increase with the 
polariton thermal conductivity of the film. This peak thus represents 
the fingerprints of the polariton contribution to the in-plane heat 
conduction, and therefore it can be used to measure the polariton 
thermal conductivity through photothermal and electrothermal techniques 
[1,2]. In particular, the developed theory together with the 3 method 
is applied to measure the polariton thermal conductivity of SiN 
nanofilms deposited on a silicon substrate. For a 50-nm-thick SiN film 
at 400 K, we find a polariton thermal conductivity of 0.7 Wm1K1, which 
represents about 50% of its phonon counterpart. This enhancement of heat 
conduction is well-predicted by fluctuational electrodynamics and an 
analytical model based on a two-dimensional gas of polaritons. The 
obtained results are thus expected to open a new research avenue for the 
polaritonic thermal characterization of nanostructures via modulated 
temperature fields.

[1] Y. Wu, J. Ordonez-Miranda, L. Jalabert, S. Tachikawa, R. Anufriev, 
H. Fujita, S. Volz, M. Nomura, Observation of heat transport mediated by 
the propagation distance of surface phonon-polaritons over hundreds of 
micrometres, Appl. Phys. Lett. 121, 112203 (2022) 
https://doi.org/10.1063/5.0100506
[2] Y. Wu, J. Ordonez-Miranda, S. Gluchko, R. Anufriev, D. De Sousa 
Meneses, L. Del Campo, S. Volz and M. Nomura, Enhanced thermal 
conduction by surface phonon-polaritons, Sci. Adv. 6, eabb4461 (2020) 
https://doi.org/10.1126/sciadv.abb4461

Best regards,
Dragan Markushev

-- 
Dr. Dragan D. MARKUSHEV
Principal Research Fellow
Photonics Center
Head of the Laboratory for Photoacoustics
Institute of Physics Belgrade
Pregrevica 118,
11080 Belgrade, SERBIA
cell: +381603169816
phone: +381113713158
fax: +381113162190
http://photonics.ipb.ac.rs/
http://www.ipb.ac.rs/