Fig. 2.

Thermal emission from 2D silicon carbide bodies augmented with dielectric rods. (A) Dielectric permittivity of silicon carbide (SiC) as a function of wavelength. Real part of the relative permittivity approaches zero at the wavelength ${\lambda }_{\text{ENZ}}=10.3\hspace{0.5em}\mathrm{\mu }\text{m}$ (highlighted by a vertical gray line) (57, 58). (B) Sketch (Left) and thermal emission pattern at ${\lambda }_{\text{ENZ}}$ (Right, computed by calculating the absorption and exploiting generalized Kirchhoff’s law). The 2D geometry consists of a right triangle (with round corners) with catheti of length 10 and 20 μm, with (red line) and without (blue line) containing a germanium rod (${\epsilon }_{\text{Ge}}\approx 16$) of radius $r_p=0.096\hspace{0.17em}{\lambda }_{\text{ENZ}}$. (C) Absorption cross-section for an incoming plane wave $\mathit{H}\left(\mathbf{r}\right)=\widehat{\mathit{z}}{H}_0\exp \left[-i{\omega }_{\text{ENZ}}\left(t-{\widehat{\mathbf{r}}}_{\text{inc}}\cdot \mathbf{r}/\text{c}\right)\right]$, corresponding to thermal emission in the −${\widehat{\mathbf{r}}}_{\text{inc}}$ direction (=63.4°). The numerical simulations ratify the resonant enhancement and directive thermal emission of 2D ENZ bodies augmented with dielectric particles.