A multi-frequency local field enhancement by a metamaterial nanopyramid

TL;DR

This paper presents a theoretical study of a metamaterial nanopyramid structure that achieves multi-frequency local field enhancement across the visible spectrum, useful for applications like sensing and photonics.

Contribution

It introduces a novel pyramid-shaped metamaterial with alternating plasmonic and dielectric nanoplates, enabling efficient light-to-hot-spot conversion and multiple plasmonic resonances.

Findings

Achieves significant local field enhancement at multiple visible frequencies.

Supports a large number of plasmonic resonances within the structure.

Provides a pathway for multi-frequency hot spot generation.

Abstract

We suggest and theoretically study the local field enhancement in a metamaterial sample shaped as a pyramid and formed by plasmonic nanoplates alternating with dielectric ones in parallel to the pyramid base. Due to very small thickness of metal nanoplates and different transversal sizes of them the structure not only offers the efficient conversion of the light wave field impinging the pyramid base into hot spots near the pyramid apex, but also a large number of plasmonic resonances at which the field enhancement holds. These resonances cover the whole visible range.