Nanophotonics of 2D Materials in Engineered Nanostructures: Non-planar and Inverse Geometries
September 13th, 2017 PAULO ANDRÉ DIAS GONÇALVES Technical University of Denmark

Recently, 2D materials and their corresponding van der Waals heterostructures have emerged as promising platforms for enhanced light-matter interactions and controlling light in nanoscale environments. Graphene—the flag-bearer of 2D crystals—sustains gate-tunable plasmons with long life-times, hexagonal boron nitride (hBN) supports low-loss phonon-polaritons, and 2D semiconductors like transition metal dichalcogenides (TMDCs) exhibit exciton-polaritons.

In this talk, after reviewing the recent progresses in the field of 2D nanophotonics, I will present an overview of our latest work on engineered plasmonic (and photonic) nanostructures based on 2D materials.

In particular, I will discuss 2D polaritons in non-planar geometries, such as channel polaritons guided along the apex of a triangular dielectric wedge or groove covered by a 2D crystal. A comprehensive description of the theory governing plasmons in these non-planar structures will be presented, including the determination of the dispersion and corresponding induced potential and field distributions. The second part of the talk will be dedicated to plasmons and other polaritonic excitations in 2D inverse structures. I will focus on a particular inverse (or complementary) structure: a 2D nano-slit, which can be regarded as the inverse structure of a 2D ribbon.

Finally, I will introduce the fundamentals of plasmonics in anisotropic 2D materials, such as black phosphorus, and give examples of functionalities that can be obtained by exploiting their anisotropic optical response. Then, I shall discuss the properties of anisotropic plasmons in a 2D nano-slit made from phosphorene (i.e., a monolayer of black phosphorus).

The results presented here could pave the way for the emergence of customized nanophotonic devices for subwavelength waveguiding and localization of light based on novel 2D materials.

Seminar, September 13, 2017, 15:00. Seminar Room

Hosted by Prof. Frank Koppens