Radiative coupling between oscillators is one of the most fundamental subjects of research inoptics, where particularly a Bragg-type arrangement is of interest and has already been appliedto atoms and excitons in quantum wells. Here we explore this arrangement in a plasmonicstructure. We observe the emergence of an octave-wide photonic band gap in the opticalregime. Compared with atomic or excitonic systems, the coupling efficiency of the particleplasmons utilized here is several orders of magnitude larger and widely tunable by changing thesize and geometry of the plasmonic nanowires. We are thus able to explore the regime wherethe coupling distance is even limited by the large radiative decay rate of the oscillators. ThisBragg-stacked coupling scheme will open a new route for future plasmonic applications suchas far-field coupling to quantum emitters without quenching, plasmonic cavity structures andplasmonic distributed gain schemes for spasers.
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