Review Articles in 2017

This Review covers key advancements in X-ray ptychographic microscopy and tomography over the past ten years. Potential applications in the life and materials sciences, the latest concepts and future developments are also discussed.

General concepts and recent developments of parity–time symmetry in classical photonics are reviewed.

The progress on non-reciprocal photonic devices enabled by temporal modulation is reviewed.

Topological photonic structures offer unique features such as reflection-free and non-reciprocal devices. This Review highlights the experimental progress in the relatively new field of photonic topology.

The importance of the Fano resonance concept is recognized across multiple fields of physics. In this Review, Fano resonance is explored in the context of optics, with particular emphasis on dielectric nanostructures and metasurfaces.

Materials whose optical properties can be reconfigured are crucial for photonic applications such as optical memories. Phase-change materials offer such utility and here recent progress is reviewed.

Photonic time-stretch techniques and their applications are reviewed. The approach enables the observation of signals that are otherwise too short or rapid for conventional measurement.

Applying metamaterial concepts to dielectric systems offers low losses compared with metallic structures. Here, silicon-based metamaterial and nanophotonic advances are reviewed.

The underlying principles and unique optical applications of structures exhibiting near-zero dielectric permittivity and/or magnetic permeability are reviewed. The timely relevance to nonlinear, non-reciprocal and non-local effects is highlighted.

This Review covers optical clock networks that are established to synchronize remote optical clocks. Further upgrading of optical clock networks and their impact on a future redefinition of time are also discussed.