Thermoplasmonic and near-field heat transfer between metamaterials II
10:30 Invited talk : Understanding and reducing electromagnetic heat transfer
University of Potsdam (Germany) We discuss strategies to reduce electromagnetic heat transfer in the context of traps for ultra-cold atoms based on nanostructures. The basic processes of fluctuation-induced friction forces and path decoherence are discussed with the help of a microscopic model using the toolbox of quantum field theory.
10:50 Invited talk : Giant Radiative Heat Flux at the Nanometer Scale Measured with our Calibrated Near Field Scanning Thermal Microscope
Achim Kittel, K. Kloppstech, N. Konne, Svend-Age Biehs, L. Worbes, D. Hellman
Physics Institute University of Oldenburg (Germany) We perform quantitative measurements of the heat flux between a gold near-field scanning thermal microscope tip and a planar gold sample at nanometer distances across a vacuum gap. We find an extraordinary large heat flux which is more than five orders of magnitude larger than black-body radiation and three orders of magnitude larger than the values predicted by conventional. The findings demand modified, or even new models to describe the heat transfer across a vacuum gap at nanometer distances.
11:10 Invited talk : Near-field thermal radiation of thin metamaterials
Xianglei Liu, Zhuomin Zhang
Georgia Institute of Technology (USA) Based on exact approaches, we demonstrated that patterning thin films into 1D and 2D nanostructures can improve its near-field heat transfer performance by more than one order of magnitude. The underlying mechanism lies in the excitation of hyperbolic modes supporting high LDOS for broad frequency and k-space regimes.
11:30 Invited talk : Fluctuating volume--current formulation of electromagnetic fluctuations in inhomogeneous media
Athanasios G. Polimeridis (1),M. T. H. Reid (2),Weiliang Jin (3),Steven G. Johnson (2),Jacob K. White (2),Alejandro W. Rodriguez (3)
(1)Skolkovo Institute of Science and Technology (Russia) , (2)Massachusetts Institute of Technology (USA) , (3)Princeton University (USA) We present a framework for the general-purpose calculation of many different incandescence and luminescence processes, including fluorescence, thermal radiation and heat transfer, that is based on the volume-integral equation formulation of electromagnetic scattering and that expands the range and validity of current methods to situations involving inhomogeneous media. We demonstrate the flexibility and utility of these techniques via new predictions of highly directional thermal emission from inhomogeneous objects subject to temperature gradients.
11:50 : Radiative heat transfer in 2D Dirac materials
Diego Dalvit (1),Pablo Rodriguez-Lopez (2),Wang-Kong Tse (1)
(1)Los Alamos National Laboratory (USA) , (2)Paris Sud University (France) We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene, within the local optics approximation. We derive both numerically and analytically the short-distance asymptotics of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. We discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2D Dirac materials.
12:05 : Hyperbolic blackbody
Slawa Lang (1),Alexander Petrov (1),Manfred Eich (1),Philippe Ben-Abdallah (2),Svend-Age Biehs (3)
(1)Hamburg University of Technology (Germany) , (2)Paris Sud University (France) , (3)Institut fur Physik-Carl von Ossietzky Universitat (Germany) We adapt the blackbody theory to analyze the thermal radiative properties of lossless, nonmagnetic uniaxial media. In case of hyperbolic media, the spectral energy density and spectral heat flux show fundamentally different behavior compared to the classical blackbody. The thermal energy is shifted to lower frequencies making hyperbolic media appear colder. Besides, both energy density and heat flux in hyperbolic media can be much larger than in vacuum or in a dielectric medium.
12:20 : Photo-thermal effect within plasmonic absorption metamaterials in infrared region
Yongqian Li, Chenglin Zhang, Xiaolun Xu
Northwestern Polytechnical University (China) The energy-conversion process and photo-thermal effect within plasmonic absorber metamaterials (PAM) were investigated theoretically using Poynting theorem. Ohmic loss and dielectric loss were calculated to estimate the amount of heat energy produced. From the microscopic details, heat-generation owing to the electric current accounts for the majority of the energy conversion, while the magnetic resonance plays a negligible role. The field confinement and redistribution within PAMs guides the design for subsequent thermal- detection.