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Edited by John B. Pendry, Imperial College London, London, United Kingdom, and approved June 3, 2019 (received for review February 6, 2019)
Significance
Surface plasmons, which are optical resonances supported by metallic nanostructures, are extremely useful for manipulating light on the nanoscale. However, designing novel plasmonic devices becomes quite challenging when the desired spectral response pattern is highly complex. Here we show that, by developing a theoretical model which combines plasmon hybridization theory with transformation optics, one can control both global and local features of the resonance spectrum in an intuitive way. As an application, we design a plasmonic metasurface whose absorption spectrum can be controlled over an extremely large class of complex patterns through only two structural parameters. Our theoretical model paves the way for the next generation of plasmonic devices, allowing for the efficient design of complex systems.
Abstract
Surface plasmon resonances of metallic nanostructures offer great opportunities to guide and manipulate light on the nanoscale. In the design of novel plasmonic devices, a central topic is to clarify the intricate relationship between the resonance spectrum and the geometry of the nanostructure. Despite many advances, the design becomes quite challenging when the desired spectrum is highly complex. Here we develop a theoretical model for surface plasmons of interacting nanoparticles to reduce the complexity of the design process significantly. Our model is developed by combining plasmon hybridization theory with transformation optics, which yields an efficient way of simultaneously controlling both global and local features of the resonance spectrum. As an application, we propose a design of metasurface whose absorption spectrum can be controlled over a large class of complex patterns through only a few geometric parameters in an intuitive way. Our approach provides fundamental tools for the effective design of plasmonic metamaterials with on-demand functionality.
Footnotes
- ↵1To whom correspondence may be addressed. Email: sanghyeon.yu{at}sam.math.ethz.ch.
Author contributions: S.Y. designed research; S.Y. and H.A. performed research; and S.Y. and H.A. wrote the paper.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1902194116/-/DCSupplemental.
Published under the PNAS license.
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Hybridization of singular plasmons via transformation optics
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