Superbackscattering nanoparticle dimers. (17th June 2015)

• Record Type: Journal Article
• Authors: Liberal, Iñigo; Ederra, Iñigo; Gonzalo, Ramón; Ziolkowski, Richard W
• Is Part Of: Nanotechnology. Volume 26:Number 27(2015)
• Publication Date: 2015-06-17
• Subjects: scattering -- nanoparticles -- dimers -- electromagnetic theory; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/26/27/274001
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: The theory and design of superbackscattering nanoparticle dimers are presented. We analytically derive the optimal configurations and the upper bound of their backscattering cross-sections. In particular, it is demonstrated that electrically small nanoparticle dimers can enhance the backscattering by a factor of 6.25 with respect to single dipolar particles. We demonstrate that optimal designs approaching this theoretical limit can be found by using a simple circuit model. The study of practical implementations based on plasmonic and high-permittivity particles has been also addressed. Moreover, the numerical examples reveal that the dimers can attain close to a fourfold enhancement of the single nanoparticle response even in the presence of high losses.