Fig. 2: Predicted emission enhancement and directivity for antenna-dimer microdisk hybrids.
From: Cooperative interactions between nano-antennas in a high-Q cavity for unidirectional light sources
a Local density of states enhancement for a source at antenna 1 as a function of the antenna separation expressed in the cavity mode profile azimuthal period and as a function of the frequency. The bare cavity resonance ωc is at 360 THz. b Directionality of the emission into the cavity. c, d LDOS enhancement (black dashed) and directionality (orange solid) versus frequency for two antenna separations, as indicated by vertical dashed lines in (a, b), just off degeneracy (c) at unit directionality and exactly on degeneracy (d) with no directionality. e, f Simulated intensity and g, h phase of the radial component Er of the electric field on the top interface of the microdisk cavity dressed by two aluminium antennas. The antenna separation is 0.94 cavity period for (e, g) and 1 cavity period for (f, h), and the simulation is driven by a radial dipole placed 10 nm radially outward from the top antenna. In (e and g), the intensity is almost perfectly homogenous in the azimuthal direction, with the phase indicating clockwise propagation. In contrast, (f and h) exhibit a standing wave pattern, as antennas and dipoles couple only the symmetric cavity mode.
