Motivated by the realization of the optical Dirac dispersion in the homogenous negative-zero-positive index (NZPI) material, we make a theoretical investigation on the properties of thermal emission in layered structures containing the NZPI medium. We find that when the thermal emission frequency is close to the Dirac point of the NZPI medium, the spectral hemispherical power of thermal emission in such a structure is strongly suppressed and the emission can become a high directional source with large spatial coherence.
|Journal||Physical Review B|
|Publication status||Published - 17 Feb 2010|
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics