Conference Agenda

TOM7 S01: Thermal radiation and energy management 1
Tuesday, 13/Sept/2022:
11:30am - 1:00pm

Session Chair: Marco Centini, Sapienza University of Rome, Italy
Location: B116

1st floor, 70 seats

11:30am - 12:00pm
ID: 267 / TOM7 S01: 1
TOM 7 Thermal radiation and energy management

Active control of near-field radiative heat transfer in many-body systems

Philippe Ben Abdallah

Laboratoire Charles Fabry, CNRS, Institut d'Optique, France

Understanding and controlling the time evolution of thermal state of a system in nonequilibrium situation is of tremendous importance both on a fundamental and practical point of view. Many strategies have been implemented to date to actively control this evolution using an external driving.

In the first part of this talk I will describe the thermal relaxation of non-Hermitian many-body systems coupled to their environment subject to periodic drivings both in adiabatic limit and beyond this limit.

In the second part I will describe the dynamic control of thermal state of many-body systems and discuss some problems of practical interest such as the thermal targeting, insulation of some elements and the synchronization of local states during the relaxation process. I will also derive the conditions to fulfill in order to accelerate the relaxation process with a minimum energetic cost and to cool some elements with a minimum time.

12:00pm - 12:30pm
ID: 262 / TOM7 S01: 2
TOM 7 Thermal radiation and energy management

Thermal radiation in dipolar many-body systems

Svend-Age Biehs

Oldenburg University, Germany

The framework of fluctuational electrodynamics for dipolar many-body systems is one of the working horse for theoretical studies of thermal radiation at the nanoscale which includes dissipation and retardation in a naturally way. Based on this framework I will discuss near-field thermal radiation in non-reciprocal and topological many-body systems. The appearance of the Hall and non-reciprocal diode effect for thermal radiation illustrates nicely the interesting physics in such systems as well as the edge mode dominated heat transfer in topological Su-Schrieffer-Heeger chains and a honeycomb lattices of plasmonic nanoparticles. In the latter, the theory allows for quantifying the efficiency of the edge-mode dominated heat transfer as function of the dissipation. Finally, I will present how the theoretical framework can be generalized to study far-field thermal emission of many-body systems close to an environment like a substrate, for instance. This theory might be particularly interesting for modelling thermal imaging microscopes.

12:30pm - 1:00pm
ID: 138 / TOM7 S01: 3
TOM 7 Thermal radiation and energy management

Quantum levitation of photonic structures

Sol Carretero Palacios

Universidad Autónoma de Madrid, Spain

The Casimir-Lifshitz force originates from the quantum vacuum fluctuations of the electromagnetic field. This force is especially intense between interacting objects at nanoscale distances, and it can be attractive or repulsive depending on the optical properties of the materials (amongst other parameters). This fundamental phenomenon is at the heart of the malfunctioning of nano- and micro-electromechanical devices (NEMS and MEMS) that integrate many of the gadgets we use in our daily lives. Absolute control over these forces would make it possible to suppress adhesion and friction in these NEMs and MEMs. Here, we will show the possibility of controlling the Casimir-Lifshitz force by tuning the optical properties of the interacting objects. Specifically, we will present diverse examples of quantum levitation based on the Casimir-Lifshitz force of self-standing thin films comprising multilayer structures and films with spatial inhomogeneities (caused by imperfections, pores, inclusions, density variations, etc).