Conference Agenda

The temperonic crystal, a periodic structure with a unit cell made of two slabs sustaining temperature wavelike oscillations on short timescales, is introduced. The complex-valued dispersion relation for the temperature scalar field is investigated for the case of a localized temperature pulse in graphene and discloses frequency gaps. The temperonic crystal extends the concept of superlattices to the realm of temperature waves, allowing for coherent control of ultrafast temperature pulses in the hydrodynamic regime at above liquid nitrogen temperatures.

This paper theoretically studies the Doppler effect for thermal waves, finding an expression of the frequency shift for the two cases of moving source, and moving observer. Differences and analogies with the Doppler effect for electromagnetic and acoustic waves are highlighted. Thermal shock waves are introduced and simulated numerically. An application for nondestructive evaluation and testing of materials is also discussed.

Circularly polarized excitations of opposite handedness are of great importance of properties of both natural and artificial chiral structures. In this work we propose the photothermal deflection technique as a method to detect the optical chirality of a metasurface, analysing the diffracted beams by the matasurface itself. New theoretical and numerical approaches are developed to reconstruct both thermal and optical behaviour of the chirality at the nanoscale.

In this work, some applications of pulsed thermography (PT) for the study of cultural heritage artefacts are presented. In particular, such applications concern depth-resolved PT investigations of ancient bronzes from the Museo Nazionale Romano and historical books from the Biblioteca Angelica in Rome. It is shown how the study of the two types of artefacts requires different thermographic approaches, both in term of experimental configuration and signal modelling. due to the different opto-thermal properties of the constituent materials.