Active control of focal length and beam deflection in a metallic nano-slit array lens with multiple sources

摘要

We propose a surface plasmon-polariton based nano-rod array lens structurethat incorporates two additional lateral input channels, with the ability tocontrol the focal length and the deflection of the transmitted beam through thelens actively by the intensity of the channel sources. We demonstrate bynumerical simulations that, applying the sources with the same intensity canchange the focal point and the beam waist, whereas unequal intensities generatean asymmetric field profile in the nano-rod array inducing an off-axis beamdeflection.