Publication Date

2-17-2020

Department

Ames Laboratory; Chemical and Biological Engineering; Physics and Astronomy

Campus Units

Ames Laboratory, Chemical and Biological Engineering, Physics and Astronomy

OSTI ID+

1599928

Report Number

IS-J 10164

DOI

10.1002/adom.201901794

Journal Title

Advanced Optical Materials

Volume Number

8

Issue Number

8

First Page

1901794

Abstract

Bottom‐up fabrication of metallized biotemplated nanostructures to form specific plasmonic nanoresonators holds promise as a means of achieving large‐scale optical metamaterials. However, in contrast to top‐down methods, the stochastic growth of self‐assembled nanoresonators is prone to significant disorder and surface roughness, which naturally raise an important question about the robustness of their resonant properties in terms of structural imperfections. An aggregated‐random‐sphere model is developed to mimic the nucleated growth of metallized DNA origami assembly, leading to meta‐atoms with realistic, experimentally observed morphological disorder and surface roughness. Using the well‐known split‐ring‐resonator (SRR) motif as an example, the resonant properties of meta‐atoms under different levels of roughness are investigated and a strong tolerance of optical response against morphological disorder is revealed. It is found that in SRRs, even with dramatic roughness introduced, the expected resonances are still observed, despite broadening line shapes compared to ideal smooth structure. Only for extreme disorder, which causes drastic segmentation of SRRs, does the resonant response disappear. The demonstrations are very encouraging for the prospects of bottom‐up fabrication toward versatile functional metamaterials and metadevices.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Publisher

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

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