Optimization of multilayered nanotubes for maximal scattering cancellation

TL;DR

This paper presents an optimization method for multilayered nanotubes that significantly reduces their scattering efficiency, enhancing invisibility by up to two orders of magnitude through a novel design and a transfer-matrix formalism.

Contribution

It introduces a new optimization approach for multilayered nanotubes with radially periodic structures to minimize scattering, including a transfer-matrix method for rapid evaluation.

Findings

Scattering efficiency reduced up to 100 times.

Marginal layers are crucial for invisibility.

Transfer-matrix formalism enables fast estimations.

Abstract

An optimization for multilayered nanotubes that minimizes the scattering efficiency for a given polarization is derived. The cylindrical nanocavities have a radially periodic distribution, and the marginal layers that play a crucial role particularly in the presence of nonlocalities are disposed to reduce the scattering efficiency up to two orders of magnitude in comparison with previous proposals. The predominant causes leading to such invisibility effect are critically discussed. A transfer-matrix formalism is additionally developed for the fast estimation of the scattering efficiency of the nanostructures.