Tunable narrow-band plasmonic resonances in electromagnetically-induced-transparency media

TL;DR

This paper demonstrates a method to dynamically tune plasmonic resonances using electromagnetically-induced transparency media, enabling control over spectral responses without altering nanostructure geometry.

Contribution

It introduces a novel approach to control plasmonic resonances via optical means in EIT media, allowing tunability and excitation of narrow-band surface plasmon polaritons.

Findings

Resonance positions can be shifted using external laser control.

Narrow-band surface plasmon polaritons can be excited.

Spectral response depends on the refractive index of the environment.

Abstract

The spectral response of a plasmonic nanostructure may heavily depend on the refractive index of its surroundings. The key idea of this paper is to control this response by coherent optical means, i.e. with an optically controlled electromagnetically-induced-transparency medium. In such environment, an external laser provides a knob to shift the position of plasmonic resonances without the need to change the geometry of the nanostructure. Additionally, the setup can be exploited to excite narrow-band surface plasmon polaritons.