About this Research Topic
In the past two decades, the areas of nanophotonics and metamaterials (including metasurfaces as their 2D version) have revolutionized our approaches to the control of waves and light-matter interactions. Recently, these fields have experienced tremendous advances by exploring two novel and promising areas: those of topological phases and time-modulations. On the one hand, photonic systems with topological properties offer the possibility of robust light propagation, and confinement, allowing for unprecedented control of waves in a wealth of fashions. Research on time-modulated media, on the other hand, aims to explore new phenomena arising from the temporal modulation of the electromagnetic parameters of media, an area that has enable to open new paradigms for the manipulation of light-matter interactions in both spatial and temporal domains.
Recent advances have demonstrated the existence of edge modes with symmetry-protected propagation in topological systems, as well as other possibilities such as confined corner modes. These topological modes have been exploited for robust wave propagation or lasing. On the other hand, temporal modulations allow to break the constraints of energy conservation and even reciprocity. This enables the possibility of backscattering-free wave propagation, which can serve as a platform for optical circuits as well novel light matter interactions or light sources. The goal of this Research Topic is to gather works on these two broad and exciting topics of topological phases and time-dependent media, and their interplay.
This Research Topic welcomes both Original Research articles and Review Articles and includes, but is not limited to, the following topics:
· Nonreciprocal wave propagation: fundamentals and applications
· Topological photonics, from photonic crystals to nanophotonics and plasmonics
· Topological metamaterials and metasurfaces
· Nonlinear and tunable topological platforms.
· Topological phases through time-modulation and synthetic dimensions
· Higher order topology
· Spatiotemporal metamaterials and metasurfaces
· Time and space-time modulated media, including metasurfaces, 2D materials, near zero index media, …
· PT symmetry and exceptional points in time-varying media.
· Non-Hermitian systems;
Keywords: topological photonics, spatiotemporal metamaterials, nonreciprocal effects, PT symmetry, metasurfaces
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