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B Diffractive Nonlocal Metasurfaces b In article number 2100633, Adam Overvig and Andrea Alù present a perspective on the emerging field of diffractive nonlocal metasurfaces, which are able to tailor both the spatial and spectral properties of light through deliberately engineered perturbations in high symmetry lattices. Highly customizable scattering rate, phase, and polarization properties, tailored over subwavelength scales, enable highly selective optical responses, offering new avenues for rationally designing ultrathin photonic devices. [Extracted from the article]

On-Chip Plasmonic Vortex Interferometers (Laser Photonics Rev. 16(10)/2022) B Optical Interferometers b In article number 2200242, Yuan-Hao Lang, Quan Xu, and colleagues have developed a new form of optical interferometers by customizing the plasmonic vortex generation from two spin channels. In several square wavelengths, plasmonic vortex interferometer constructs interference field with subwavelength fine structure, demonstrating the measurement of polarization state, spin, and orbital angular momentum of the incident light beam. [Extracted from the article]