Polarisation Control of Nanoantenna Cold Spots

TL;DR

This paper demonstrates a method to create and control ultra-small, zero-magnitude cold spots near nanoantennas by adjusting the polarization and amplitude of two plane waves, enabling rapid, remote electric field manipulation.

Contribution

It introduces a novel technique for polarisation-based control of nanoantenna cold spots, allowing precise, non-mechanical manipulation of sub-wavelength electric fields.

Findings

Cold spots can be generated anywhere around a nanoantenna.

Polarisation and amplitude adjustments enable precise control.

The method allows ultra-fast, remote electric field manipulation.

Abstract

Cold spots are sub-wavelength regions which might emerge near a plasmonic nanoantenna, should one or more components of some far-field illumination cancel out with scattered light. With a simplest-case demonstration using two dipolar scatterers, we show that by changing only the polarisation and amplitude of two plane waves, a unique, zero-magnitude and super sub-wavelength cold spot can be created anywhere in the space around a nanoantenna. This technique is a means for ultra-fast, remote, and non-mechanical sub-wavelength electric field manipulation.