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In this report we present our study of interaction of light carrying OAM (Orbital Angular Momentum) with nanometric metallic discs. Plasmonic eﬀects are known to give rise to high local ﬁeld enhancement factors in gold nano-discs . These high intensities near ﬁelds have found use in a wide variety of imaging and detection applications . The local ﬁeld enhancement factor near the surface of the disc was calculated numerically using ﬁnite element method using the Comsol package. We report a signiﬁcant increase in the local ﬁeld enhancement factor for light beams carrying OAM compared to Gaussian beams which are attributed to localised surface plasmon resonances (LSPR). Such large enhancements in the ﬁeld can be immensely useful in the ﬁeld on near ﬁeld microscopy and electron generation.
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LSPR, OAM, nearfield enhancement, vortex beams