Group-Velocity-Controlled and Gate-Tunable Directional Excitation of Polaritons in Graphene-Boron Nitride Heterostructures

Yuyu Jiang, Xiao Lin, Tony Low, Baile Zhang, Hongsheng Chen

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A fundamental building block in nano-photonics is the ability to directionally excite highly squeezed optical mode dynamically, particularly with an electrical bias. Such capabilities would enable the active manipulation of light propagation for information processing and transfer. However, when the optical source is built-in, it remains challenging to steer the excitation directionality in a flexible way. Here, a mechanism is revealed for tunable directional excitation of highly squeezed polaritons in graphene-hexagonal boron nitride (hBN) heterostructures. The effect relies on controlling the sign of the group velocity of the coupled plasmon-phonon polaritons, which can be flipped by simply tuning the chemical potential of graphene (through electrostatic gating) in the heterostructures. Graphene-hBN heterostructures thus present a promising platform toward nano-photonic circuits and nano-devices with electrically reconfigurable functionalities.

Original languageEnglish (US)
Article number1800049
JournalLaser and Photonics Reviews
Volume12
Issue number5
DOIs
StatePublished - May 1 2018

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Boron nitride
boron nitrides
group velocity
polaritons
Graphene
Heterojunctions
graphene
Photonics
photonics
excitation
information transfer
Light propagation
Chemical potential
Light sources
manipulators
Electrostatics
platforms
Tuning
tuning

Keywords

  • directional excitation
  • graphene-hBN heterostructures
  • plasmon-phonon polaritons

Cite this

Group-Velocity-Controlled and Gate-Tunable Directional Excitation of Polaritons in Graphene-Boron Nitride Heterostructures. / Jiang, Yuyu; Lin, Xiao; Low, Tony; Zhang, Baile; Chen, Hongsheng.

In: Laser and Photonics Reviews, Vol. 12, No. 5, 1800049, 01.05.2018.

Research output: Contribution to journalArticle

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