Expert Profile:

Jian-Sheng Wang graduated from Jilin University with a B.Sc in 1982. He joined the CUSPEA programme in 1982 and obtained Ph.D. (1987) in Physics from Carnegie-Mellon University. He had postdoctoral positions at Rutgers University (USA), HLRZ Juelich and University of Mainz (Germany). His first job was at Hong Kong Baptist College from 1991 to 1993. Since 1993, he has been at National University of Singapore. He was in the Department of Computational Science, and is now a professor in the Department of Physics. He is a fellow of the American Physical Society (2005) for his outstanding contributions to the development of novel computer simulation algorithms and for their use in the study of phase transitions and critical phenomena. Dr. Jian-Sheng Wang's research has focused on the Monte Carlo method in statistical physics. He is well-known for developing the cluster algorithm, also known as the Swendsen-Wang algorithm, for simulating Ising and Potts models. However, over the past twenty years or so, his interests move to quantum thermal transport, and radiative heat transfer with photonic nonequilibrium Green’s functions.

Presentation Title：

Photonic bath at infinity

Abstract：

Electromagnetic waves emitted by an object propagate to infinity, requiring the far region to be modeled as an effective thermal bath. This bath was proposed by Eckhardt in 1984 as infinitesimal environmental “dust”, but explicit calculations with such distributed dust involve integrals over infinite space that are difficult to evaluate. We map this environmental dust to a photonic bath at infinity within the nonequilibrium photonic Green's function formalism. By explicitly evaluating the spatial integral over the dust, we show that its contribution reduces to a simple local self-energy, for which we derive analytical expressions for both three-dimensional objects and planar systems. We further demonstrate that the bath behaves as a blackbody and clarify its role in far-field thermal radiation.  The photonic bath at infinity provides a convenient framework for both analytical and numerical calculations in far-field thermal radiation.

Ref: G. Tang, Y. Ren, and J.-S. Wang, arXiv:2605.02265