Large-Area Fabrication of Complex Nanohole Arrays with Highly Tunable Plasmonic Properties

Yanfeng Wang; Harrison B Chong; Zhengjun Zhang; Yiping Zhao

doi:10.1021/acsami.0c06936

Large-Area Fabrication of Complex Nanohole Arrays with Highly Tunable Plasmonic Properties

ACS Appl Mater Interfaces. 2020 Aug 19;12(33):37435-37443. doi: 10.1021/acsami.0c06936. Epub 2020 Aug 6.

Authors

Yanfeng Wang^{1

2}, Harrison B Chong², Zhengjun Zhang¹, Yiping Zhao²

Affiliations

¹ Key Laboratory of Advanced Materials (MOE) and School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
² Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United States.

PMID: 32698576
DOI: 10.1021/acsami.0c06936

Abstract

By combining nanosphere lithography with oblique angle deposition, large-area asymmetric compound Ag nanohole arrays with nanorods inside the hole were patterned on substrates. The technique enabled the production of complex nanohole arrays with controlled hole diameter, thickness, and rod structure inside the hole. The compound asymmetric Ag nanohole structures showed strong polarization-dependent optical properties, and a new extraordinary optical transmission (EOT) mode with tunable resonance wavelength at the near-IR region was observed. The transmission at the new EOT wavelength region can increase from 27% of nanohole to 69% of the compound structure, and these structures can achieve a refractive index sensitivity as high as 847 nm RIU^-1. The tunable EOT wavelength and strong polarization-dependent optical properties make the structure ideal for ultrathin optical filters, polarizers, surface-enhanced spectroscopies, etc.

Keywords: Y-shaped nanorod in nanohole; compound asymmetric nanohole array; extraordinary optical transmission; nanorod in nanohole; tunable transmission.