Fig. 3.

Radiation pattern of vdWQT device emission. a Calculated emission pattern of an electric point dipole located at a distance of 1 nm above a gold half-space, radiating a free space wavelength of 800 nm. Arrows indicate the position-dependent orientation of the electric field vector. The maximum value of the in-plane wave vector component $k_{\mid \mid }={\left(k_x^2+k_y^2\right)}^{1∕2}$ is given by k_||,max = NA × k₀ where NA = 0.9 is the numerical aperture of the objective and k₀= 2π/λ. b Measured angular distribution of photons emitted into the upper half-space. c, d As b when measured through a polarizer whose transmitting axis is oriented horizontally/vertically, respectively