Directional excitation of graphene surface plasmons

Directional excitation of graphene surface plasmons

We propose a scheme to directionally couple light into graphene plasmons by placing a graphene sheet on a magneto-optical substrate. When a magnetic field is applied parallel to the surface, the graphene plasmon dispersion relation becomes asymmetric in the forward and backward directions. It is...

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Bibliographic Details
Main Authors: Chong, Yi Dong, Liu, Fangli, Qian, Cheng
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2015
Subjects:
DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Online Access:https://hdl.handle.net/10356/96758
http://hdl.handle.net/10220/38486
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Institution: Nanyang Technological University
Language: English
Description
Summary:We propose a scheme to directionally couple light into graphene plasmons by placing a graphene sheet on a magneto-optical substrate. When a magnetic field is applied parallel to the surface, the graphene plasmon dispersion relation becomes asymmetric in the forward and backward directions. It is possible to achieve unidirectional excitation of graphene plasmons with normally incident illumination by applying a grating to the substrate. The directionality can be actively controlled by electrically gating the graphene, or by varying the magnetic bias. This scheme may have applications in graphene-based opto-electronics and sensing.

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