A special issue of Photonics (ISSN 2304-6732).
Deadline for manuscript submissions: closed (15 September 2020) | Viewed by 8082
Topological phases in photonics have attracted significant interest since their first experimental demonstration in 2009, with observations in various platforms ranging from microwave metamaterials to nanoscale photonic crystals. Exciting developments in the past few years have included:
- The emergence of 2D crystalline symmetry-protected topological phases as a platform for dielectric topological photonic crystals
- Design of 3D topological photonic crystals and their realization at microwave frequencies
- Generalizations of the topological band theory to non-Hermitian systems with gain and/or loss
- Observations of lasing in topological photonic crystals and lattices
These developments highlight rapid progress towards harnessing topological concepts in future photonic devices such as optical isolators, lasers, and integrated waveguides. However, there are still a number of outstanding fundamental questions, such as:
- Are current most popular methods used to implement photonic topological phases, largely based on isotropic dielectric media, optimal? Can topological photonics be extended to new classes of optical materials?
- What are the ultimate limits to the size of topological photonic systems? Can 3D photonic topological insulators be scaled to visible wavelengths?
- What role do topological phases play in nonlinear optical effects such as saturable gain or self-focusing? Can topological protection improve the performance of nonlinear devices such as lasers, switches, and isolators?
This Special Issue aims to highlight the most recent advances in the rapidly-evolving field, including theory, experiment, and potential applications. We welcome contributions studying not just topological photonics, but also closely related topics such as spin-orbit interactions of light, optical surface waves, and novel synergies between photonics and condensed matter physics.
Dr. Daniel Leykam
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