科研之友
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摘要
A simplified plasmonic lens composed of a single concentric annular ring with cross section of an asymmetric slot is proposed and investigated. By adding an auxiliary nanocavity under the primary annular slot, unidirectional plasmonic waves are efficiently launched to the inward direction and focused to a hot spot in the center. Due to the asymmetric slot, high excitation efficiency for unidirectional inward focusing can be achieved by numerically optimizing the geometric parameters of the single annular ring using the finite-difference time domain (FDTD) method. The proposed structure can decrease background noises and prevent crosstalks of nearby components in optical networks. This advantage for the plasmonic lens would dramatically increase the integration level of future nanophotonic circuits and devices.
