  Two dimensional (2D) transition metal dichalcogenide (TMDC) materials, such
as MoS2, WS2, MoSe2, and WSe2, have received extensive attention in the past
decade due to their extraordinary physical properties. The unique properties
make them become ideal materials for various electronic, photonic and
optoelectronic devices. However, their performance is limited by the relatively
weak light-matter interactions due to their atomically thin form factor.
Resonant nanophotonic structures provide a viable way to address this issue and
enhance light-matter interactions in 2D TMDCs. Here, we provide an overview of
this research area, showcasing relevant applications, including exotic light
emission, absorption and scattering features. We start by overviewing the
concept of excitons in 1L-TMDC and the fundamental theory of cavity-enhanced
emission, followed by a discussion on the recent progress of enhanced light
emission, strong coupling and valleytronics. The atomically thin nature of
1L-TMDC enables a broad range of ways to tune its electric and optical
properties. Thus, we continue by reviewing advances in TMDC-based tunable
photonic devices. Next, we survey the recent progress in enhanced light
absorption over narrow and broad bandwidths using 1L or few-layer TMDCs, and
their applications for photovoltaics and photodetectors. We also review recent
efforts of engineering light scattering, e.g., inducing Fano resonances,
wavefront engineering in 1L or few-layer TMDCs by either integrating resonant
structures, such as plasmonic/Mie resonant metasurfaces, or directly patterning
monolayer/few layers TMDCs. We then overview the intriguing physical properties
of different types of van der Waals heterostructures, and their applications in
optoelectronic and photonic devices. Finally, we draw our opinion on potential
opportunities and challenges in this rapidly developing field of research.
