Simplified model for periodic nanoantennae: linear model and inverse design

TL;DR

This paper introduces a simplified, fast, and versatile model for predicting and designing the spectral response of nanoantennae, significantly reducing computational time compared to traditional methods.

Contribution

It presents a minimal simulation-based model that enables rapid inverse design and spectral prediction of nanoantennae across different geometries and modeling approaches.

Findings

Model reduces simulation time from hours to seconds.

Accurately predicts spectral responses for various nanoantennae geometries.

Applicable to both 3D finite-element and 2D harmonic analysis models.

Abstract

We determine and use a minimal set of numerical simulations to create a simplified model for the spectral response of nanoantennae with respect to their geometric and modeling parameters. The simplified model is then used to rapidly obtain best-fit modeling parameters to match experimental results, accurately predict the spectral response for various geometries, and inversely design antennae to have a desired performance. This method is structure and model independent, and is applied here to both nanoantenna pair arrays and strips modeled using a 3D finite-element method and 2D spatial harmonic analysis, respectively. Typical numerical simulations may need hours per model, whereas this method, after the initial time to obtain a baseline set of simulations, requires only seconds to analyze and generate spectra for new geometries.