Controlling emission and absorption, and radiative heat transfer, is important for photonic
energy conversion and thermal management. However, the reciprocal emission and …

Anisotropic planar polaritons-hybrid electromagnetic modes mediated by phonons,
plasmons, or excitons-in biaxial two-dimensional (2D) van der Waals crystals have attracted …

Thermal emission—the process through which all objects with a finite temperature radiate
electromagnetic energy—has generally been thought to obey reciprocity, where the …

Nonreciprocal elements are a vital building block of electrical and optical systems. In the
infrared regime, there is a particular interest in structures that break reciprocity because their …

Weyl semimetals are topological materials whose electron quasiparticles obey the Weyl
equation. They possess many unusual properties that may lead to new applications. This is …

A body that violates Kirchhoff's law of thermal radiation exhibits an inequality in its spectral
directional absorptivity and emissivity. Achieving such an inequality is of fundamental …

Nonreciprocal radiation has potential applications in the fields of aerospace, energy
conversion, and communications. In this paper, the strong nonreciprocal radiation effect in …

Kirchhoff's law is one of the most fundamental law in thermal radiation. The violation of
traditional Kirchhoff's law provides possibilities for achieving energy conversion with higher …

The perfect nonreciprocal radiation effect for extreme small incident angle is studied. The
proposed scheme consists of a patterned magneto-optical (MO) material on a continuous …

Kirchhoff's law of thermal radiation imposes a constraint on photon-based energy harvesting
processes since part of the incident energy flux is inevitably emitted back to the source. By …