Abstract:Collective optical interactions in infinite nanoparticle arrays have been studied intensively over the past decade. However, analysis of finite arrays has received significantly less attention. Here, we theoretically and numerically...
Analysis of non-Hermitian photonic systems by the spectral
positions
of their topological singularities plays a central role in their design.
Recently, the link between topological phase singularities and existing
schemes for wavefront manipulation revealed that the full-2π
phase control of light scattering from non-Hermitian metasurfaces
is associated with branch cut crossing on the complex frequency plane.
Here, we report on controlling the spectral positions of topological
singularities for electrically tunable monolayer transition metal
dichalcogenide heterostructures so as to actively change their scattering
parameters. We use the complex frequency plane trajectories to demonstrate
full-2π phase modulation with uniform reflectance, enabling
dynamic beam deflection with near-unity diffraction efficiency, and
to explore in-plane coupling effects at the surface. Our results can
be further extended to explore effects of excitonic resonances on
tunable topological platforms for arbitrary wavefront manipulation
and exceptional point-based sensing as new directions for active two-dimensional
nanophotonics.
Analysis of non-Hermitian photonic systems by the spectral
positions
of their topological singularities plays a central role in their design.
Recently, the link between topological phase singularities and existing
schemes for wavefront manipulation revealed that the full-2π
phase control of light scattering from non-Hermitian metasurfaces
is associated with branch cut crossing on the complex frequency plane.
Here, we report on controlling the spectral positions of topological
singularities for electrically tunable monolayer transition metal
dichalcogenide heterostructures so as to actively change their scattering
parameters. We use the complex frequency plane trajectories to demonstrate
full-2π phase modulation with uniform reflectance, enabling
dynamic beam deflection with near-unity diffraction efficiency, and
to explore in-plane coupling effects at the surface. Our results can
be further extended to explore effects of excitonic resonances on
tunable topological platforms for arbitrary wavefront manipulation
and exceptional point-based sensing as new directions for active two-dimensional
nanophotonics.
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