thermal

Here, we experimentally demonstrate thermal transport in amorphous atomic-scale superlattices that can provide lower thermal conductivity value than amorphous limit.

We propose a cost-effective, large-area, and maskless nanofabrication method that creates external nanocones on the silicon surface while preserving its interior. Our experiments show that these nanocones reduce the thermal conductivity of thin silicon membranes by more than 40%.

We measure thermal conductivity of SiN thin suspended membranes and demonstrate Surface Phonon Polariton contribution being of the same order of magnitude as phonon thermal conductivity.

Here, we experimentally probed ballistic thermal transport at distances of 400–800 nm and temperatures of 4–250 K. Measuring thermal properties of straight and serpentine silicon nanowires, we found that at 4 K heat conduction is quasi-ballistic with stronger ballisticity at shorter length scales.

We measure the thermal conductivity of silicon phononic crystals with asymmetric holes at room and liquid helium temperatures and study the effect of thermal rectification, phonon boundary scattering, neck transmission, and hole positioning.

Here, we experimentally demonstrate quasi-ballistic heat conduction in silicon nanowires (NWs). We show that the ballisticity is the strongest in short NWs at low temperatures but weakens as the NW length or temperature is increased.

My phd work covers various types of thermal energy manipulation using surface effects at nanoscale and includes theoretical analysis, numerical simulations, nanofabrications, and optical measurements.

Here we propose to use a figure of merit for Surface Phonon Polaritons in order to simplify the analysis of in-plane SPhP optimisation.

We detect thermally excited surfaces waves on a submicron SiO2 layer, including Zenneck and guided modes in addition to Surface Phonon Polaritons. We demonstrate a source of broadband coherent thermal emission by using nanostructured interfaces.

We analyze the energy transport of surface phonon polaritons propagating in a chain of spheroidal polar nanoparticles. We develop a theoretical model to quantify the energy transport of SPhPs propagating along these nanostructures.