Mode Engineering in Large Arrays of Coupled Plasmonic–Dielectric Nanoantennas

Córdova‐Castro, R. Margoth; Krasavin, Alexey V.; Nasir, Mazhar E.; Wang, Pan; Bouillard, Jean Sebastien G.; McPolin, Cillian P. T.; Zayats, Anatoly V.

Abstract

Strong electromagnetic field confinement and enhancement can be readily achieved in plasmonic nanoantennas, however, this is considerably more difficult to realize over large areas, which is essential for many applications. Here, dispersion engineering in plasmonic metamaterials is applied to successfully develop and demonstrate a coupled array of plasmonic–dielectric nanoantennas offering an ultrahigh density of electromagnetic hot spots (10 cm ) over macroscopic, centimeter scale areas. The hetero-metamaterial is formed by a highly ordered array of vertically standing plasmonic dipolar antennas with a ZnO gap and fabricated using a scalable electrodeposition technique. It supports a complex modal structure, including guided, surface and gap modes, which offers rich opportunities, frequently beyond the local effective medium theory, with optical properties that can be easily controlled and defined at the fabrication stage. This metamaterial platform can be used in a wide variety of applications, including hot-electron generation, nanoscale light sources, sensors, as well as nonlinear and memristive devices. 11 −2

Citation

Córdova‐Castro, R. M., Krasavin, A. V., Nasir, M. E., Wang, P., Bouillard, J. S. G., McPolin, C. P. T., & Zayats, A. V. (in press). Mode Engineering in Large Arrays of Coupled Plasmonic–Dielectric Nanoantennas. Advanced Optical Materials, Article 2001467. https://doi.org/10.1002/adom.202001467

• Journal Article Type: Article
• Acceptance Date: Feb 22, 2021
• Online Publication Date: Mar 19, 2021
• Deposit Date: Mar 30, 2021
• Publicly Available Date: Mar 30, 2021
• Journal: Advanced Optical Materials
• Print ISSN: 2195-1071
• Electronic ISSN: 2195-1071
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Article Number: 2001467
• DOI: https://doi.org/10.1002/adom.202001467
• Keywords: Electromagnetic hot spots; Field enhancement; Self‐assembled nanoantennas
• Public URL: https://hull-repository.worktribe.com/output/3743721