Superradiance, subradiance, and suppressed superradiance of dipoles near a metal interface

We theoretically characterize the collective radiative behavior of N classical emitters near an interface between different dielectrics that supports the transfer of surface plasmon modes into the far-field of electromagnetic radiation. The phenomena of superradiance and surface plasmons can be combined to amplify the emitted radiation intensity S as S=AN2S0 compared to a single emitter's intensity S0 in free space. For a practical case study within the article A=240, compared to A=1 in free space. We furthermore demonstrate that there are collective modes for which the intensity of the emitted radiation is suppressed by 2 orders of magnitude despite their supperadiant emission characteristics. A method to control the emission characteristics of the system and to switch from super- to subradiant behavior with a suitably detuned external driving field is devised.