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

TL;DR

This paper introduces a nano-rod array lens with active control of focal length and beam deflection using multiple input channels, enabling dynamic beam shaping through intensity modulation.

Contribution

It presents a novel surface plasmon-polariton nano-lens design with active control capabilities via lateral input channels, demonstrated through numerical simulations.

Findings

Equal source intensities adjust focal length and beam waist

Unequal intensities cause off-axis beam deflection

Active control enables dynamic beam shaping

Abstract

We propose a surface plasmon-polariton based nano-rod array lens structure that incorporates two additional lateral input channels, with the ability to control the focal length and the deflection of the transmitted beam through the lens actively by the intensity of the channel sources. We demonstrate by numerical simulations that, applying the sources with the same intensity can change the focal point and the beam waist, whereas unequal intensities generate an asymmetric field profile in the nano-rod array inducing an off-axis beam deflection.