All-angle negative refraction of highly squeezed plasmon and phonon polaritons in graphene–boron nitride heterostructures
López, Josué J.
Joannopoulos, John D.
Date of Issue2017
School of Physical and Mathematical Sciences
A fundamental building block for nanophotonics is the ability to achieve negative refraction of polaritons, because this could enable the demonstration of many unique nanoscale applications such as deep-subwavelength imaging, superlens, and novel guiding. However, to achieve negative refraction of highly squeezed polaritons, such as plasmon polaritons in graphene and phonon polaritons in boron nitride (BN) with their wavelengths squeezed by a factor over 100, requires the ability to flip the sign of their group velocity at will, which is challenging. Here we reveal that the strong coupling between plasmon and phonon polaritons in graphene–BN heterostructures can be used to flip the sign of the group velocity of the resulting hybrid (plasmon–phonon–polariton) modes. We predict all-angle negative refraction between plasmon and phonon polaritons and, even more surprisingly, between hybrid graphene plasmons and between hybrid phonon polaritons. Graphene–BN heterostructures thus provide a versatile platform for the design of nanometasurfaces and nanoimaging elements.
Proceedings of the National Academy of Sciences of the United States of America
© 2017 The Author(s). This is the author created version of a work that has been peer reviewed and accepted for publication in Proceedings of the National Academy of Sciences of the United States of America, published by National Academy of Sciences on behalf of The Author(s). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1073/pnas.1701830114].