Abstract
In this paper, anisotropic graphene plasmonic structures are explored for light trapping and absorption enhancement in surrounding media. It is shown that electrically tunable and versatile spectral and polarization selectivity can be realized. Particularly, it is possible to control absorption of the incident light’s polarization component at a specific wavelength by varying the Fermi energy with suitable geometric designs. It may find applications for new types of infrared and THz photodetectors and will promote the research of other novel polarization devices.
Highlights
Plasmonics provide a powerful platform for controlling light–matter interactions and enable a variety of novel properties for functional photonic devices
We study the light trapping and absorption enhancement functionalities of anisotropic graphene plasmonic structures
The graphene is modelled as a conductive surface [12,13,14] and the optical conductivity of graphene can be derived within the random-phase approximation (RPA) in the local limit [15,16]
Summary
Plasmonics provide a powerful platform for controlling light–matter interactions and enable a variety of novel properties for functional photonic devices. Plasmonic structures can provide additional advantages, such as spectral selectivity and polarization control, which can be appealing for photodetectors [3,4,5]. Graphene plasmons have been proposed for light trapping and absorption enhancement in photodetectors [10].
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