Surface plasmon resonance in two-dimensional nanobottle arrays

We report our recent work on surface plasmon polaritons manipulation of two-dimensional arrays of subwavelength bottle-shaped cavities on gold surface. By tuning the geometry of such "nanobottle" it is possible to control the resonant frequencies and near field patterns of different surface plasmon resonances. The plasmonic band structures are not sensitive to the sizes and depths of the nano-bottles, but depend strongly on the polarization. In particular, by using different polarizations, it is observed that different types of plasmonic resonances, whether propagating or localized, can be excited independently. Moreover, we find that the local field and field intensity can by fine-tuned by controlling the topology of the bottleneck of the nanobottle. As a result, we believe these nanobottle arrays are useful for making plasmonic devices.