Publication Date

6-1-2021

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Physics and Astronomy, Ames Laboratory

OSTI ID+

1797385

Report Number

IS-J 10505

DOI

10.1021/acsphotonics.1c00599

Journal Title

ACS Photonics

Volume Number

8

Issue Number

6

First Page

1856

Last Page

1862

Abstract

The characterization of metamaterials typically depends on the determination of scattering parameters like transmittance and reflectance, and comparison with numerical models. While, numerically, coherent plane wave scattering amplitudes for infinite perfectly periodic samples are readily accessible, experimental measurements necessarily involve scattering of possibly incoherent optical probes with finite-size illumination spots on finite sample surfaces that need to serve as a proxy for the true plane wave scattering amplitudes. In some situations, but not always, this difference can lead to substantially different observed scattering spectra. Here, we investigate and analyze the observable effects on the measured scattering spectra originating from coherent versus incoherent optical probes, finite illumination spot size, magnifying imaging systems, as well as beam shaping optical elements. We discuss the relation of all the above to the wave vector content of the illumination and the sample’s spatial dispersion properties, and we show that they can result in qualitatively significant deviations of observed scattering spectra from true plane wave scattering, which needs to be taken into account to really understand experiments and allow a faithful comparison with simulations.

DOE Contract Number(s)

AC02-07CH11358; FETOPEN-737071

Language

en

Department of Energy Subject Categories

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Wednesday, June 01, 2022

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