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Science China Information Sciences

, Volume 56, Issue 12, pp 1-13

Harvesting light with transformation optics

  • Yu LuoAffiliated withThe Blackett Laboratory, Department of Physics, Imperial College London Email author 
  • , RongKuo ZhaoAffiliated withThe Blackett Laboratory, Department of Physics, Imperial College London
  • , Antonio I. Fernandez-DominguezAffiliated withThe Blackett Laboratory, Department of Physics, Imperial College London
  • , Stefan A. MaierAffiliated withThe Blackett Laboratory, Department of Physics, Imperial College London
  • , John B. PendryAffiliated withThe Blackett Laboratory, Department of Physics, Imperial College London

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Abstract

Transformation optics (TO) is a new tool for controlling electromagnetic fields. In the context of metamaterial technology, it provides a direct link between a desired electromagnetic (EM) phenomenon and the material response required for its occurrence. Recently, this powerful framework has been successfully exploited to study surface plasmon assisted phenomena such as light harvesting. Here, we review the general strategy based on TO to design plasmonic devices capable of harvesting light over a broadband spectrum and achieving considerable field confinement and enhancement. The methodology starts with two-dimensional (2D) cases, such as 2D metal edges, crescent-shaped cylinders, nanowire dimers, and rough metal surfaces, and is well extended to fully-fledged three-dimensional (3D) situations. The largely analytic approach gives physical insights into the processes involved and suggests a way forward to study a wide variety of plasmonic nanostructures.

Keywords

transformation optics light harvesting surface plasmons broadband absorption field enhancement