Routing of valley photons in a WS2 monolayer via delocalized Bloch modes of in-plane inversion-symmetry broken photonic crystal slabs
arXiv:2003.09589 · doi:10.1038/s41377-020-00387-4
Abstract
The valleys of two-dimensional transition metal dichalcogenides (TMDCs) offer a new degree of freedom for information processing. To take advantage of this valley degree of freedom, on one hand, it is feasible to control valleys by utilizing different external stimuli like optical and electric fields. On the other hand, nanostructures are also used to separate the valleys by near field coupling. However, for both above methods, either required low-temperature environment or low degree of coherence properties limit their further applications. Here, we demonstrate all-dielectric photonic crystal (PhC) slabs without in-plane inversion symmetry (C2 symmetry) could separate and route valley photons in a WS2 monolayer at room temperature. Coupling with circularly polarized photonic Bloch modes of such PhC slabs, valley photons emitted by a WS2 monolayer are routed directionally and efficiently separated in the far field. In addition, the far-field emission is directionally enhanced and with long-distance spatial coherence property.
arXiv comment14 pages, 5 figures
References in corpus (20)
- Control of valley polarization in monolayer MoS2 by optical helicity
- Valley polarization in MoS2 monolayers by optical pumping
- MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Optical modulators with two-dimensional layered materials
- Resonantly Trapped Bound State in the Continuum Laser
- Topological nature of bound states in the radiation continuum
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- A Silicon-on-Insulator Slab for Topological Valley Transport
- Circularly polarized states spawning from bound states in the continuum
- Analytical Perspective for Photonic Bound States in the Continuum in Photonic Crystal Slabs
- Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
- Observation of optical vortices in momentum space
- Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2
- Nanoscale chiral valley-photon interface through optical spin-orbit coupling
- Coexistence of quantized and non-quantized geometric phases in quasi-one-dimensional systems without inversion symmetry
- Coupled-wave model for square-lattice photonic-crystal lasers with TE polarization -- a general approach
- Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
- Optical Selection Rule based on Valley-Exciton Locking for 2D Valleytronics
- Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
Cited by in corpus (5)
- Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
- Engineering photonic environments for two-dimensional materials
- Photonics in Flatland: Challenges and Opportunities for Nanophotonics with 2D Semiconductors
- Influence of resonant plasmonic nanoparticles on optically accessing the valley degree of freedom in 2D semiconductors
- Valley-dependent emission patterns enabled by plasmonic nanoantennas