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Manipulating type-I and type-II Dirac polaritons in cavity-embedded honeycomb metasurfaces
Charlie-Ray Mann1, Thomas J Sturges2, Guillaume Weick3
1EPSRC Centre for Doctoral Training in Metamaterials (XM2), Department of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL, UK. cm433@exeter.ac.uk.
Nature Communications
|June 8, 2018
Summary
Researchers discovered a new way to control Dirac polaritons in artificial graphene systems. By adjusting the photonic environment, they can change polariton properties without altering the lattice structure, opening new avenues for subwavelength physics.
Area of Science:
- Condensed Matter Physics
- Photonics
- Materials Science
Background:
- Pseudorelativistic Dirac quasiparticles are observed in artificial graphene systems with honeycomb symmetry.
- Manipulating these quasiparticles typically requires lattice structure modification, which is challenging.
Purpose of the Study:
- To theoretically investigate polaritons in honeycomb metasurfaces.
- To explore the possibility of manipulating Dirac physics without altering the lattice structure.
Main Methods:
- Theoretical investigation of polaritons supported by honeycomb metasurfaces.
- Analysis of light-matter interaction and winding properties.
- Modification of the photonic environment using an enclosing cavity.
Main Results:
- Honeycomb metasurfaces exhibit two species of massless Dirac polaritons: type-I and type-II.
- The photonic environment can be used to control the location of type-II Dirac points.
- Qualitatively different polariton phases emerge upon modification of the photonic environment.
Conclusions:
- It is possible to manipulate Dirac polariton properties by altering the photonic environment, preserving the lattice structure.
- This offers a unique approach to exploring Dirac physics not achievable in real or artificial graphene.
- Exploiting the photonic environment enables new subwavelength Dirac physics discoveries.
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