Resonances On-Demand for Plasmonic Nano-Particles

TL;DR

This paper introduces a rigorous method for designing plasmonic nanoparticles with specific resonance spectra, enabling precise control over their optical properties for applications like nano-antennas and metamaterials.

Contribution

The paper presents a novel, mathematically rigorous approach for on-demand spectral design of plasmonic particles through iterative shape perturbations and eigenvalue calculations.

Findings

Successfully designed resonances in visible and near-infrared ranges

Verified designs with finite-difference time-domain simulations

Created particles with collocated dipole-quadrupole resonances

Abstract

A method for designing plasmonic particles with desired resonance spectra is presented. The method is based on repetitive perturbations of an initial particle shape while calculating the eigenvalues of the various quasistatic resonances. The method is rigorously proved, assuring a solution exists for any required spectral resonance location. Resonances spanning the visible and the near-infrared regimes, as designed by our method, are verified using finite-difference time-domain simulations. A novel family of particles with collocated dipole-quadrupole resonances is designed, demonstrating the unique power of the method. Such on-demand engineering enables strict realization of nano-antennas and metamaterials for various applications requiring specific spectral functions.