Abstract
In this work, a new plasmonic bulls-eye structure is introduced to efficiently harvest the emitted light from diamond nitrogen vacancy (NV) centers. We show that the presence of a simple metal sub-layer underneath of a conventional bulls-eye antenna, separated by a dielectric layer, results in the spontaneous emission enhancement and increment in out-coupled light intensity. High Purcell factor is accessible in such a structure, which consequently boosts efficiency of the radiated light intensity from the structure. The structure shows considerable enhancement in far-field intensity, about three times higher than that of a one-side corrugated (conventional) optimized structure. In addition, we study for the first time asymmetric structures to steer emitted beams in two-axis. Our results show that spatial off-axial steering over a cone is approachable by introducing optimal asymmetries to grooves and ridges of the structure. The steered light retains a level of intensity even higher than conventional symmetric structures. A high value of directivity of 16 for off-axis steering is reported.
Highlights
Corrugated plasmonic antennas have been focus of numerous researches in last years
We have considered diamond nitrogen vacancy (NV) centers to be doped to dielectric and placed inside the central cavity
For an emitter placed inside a metallic cavity, to have high far-field intensity it is necessary to have high Purcell factor and low light dissipation through loss channels [24,25,26]
Summary
Corrugated plasmonic antennas have been focus of numerous researches in last years Such structures provide light transmission enhancement, light steering and efficient light collection from embedded fluorescence centers [1,2,3,4,5]. High rate of photon generation, and directive far-field coupled light are required for an ideal case For this purpose, plasmonic Bulls-eye structure is an excellent candidate as discussed in some literature [17,18,19]. Based on the reported structures for efficient light collection from florescence sources we have optimized the design with high degree of directivity and out-coupled field intensity. Results show viability of the design for efficiently collect and steer the light over a cone
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