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Challenges in biological imaging include labeling, photobleaching and phototoxicity, as well as light scattering. Here, Nguyen et al. develop a quantitative phase method that uses low-coherence interferometry for label-free 3D imaging in scattering tissue.
Hyperbolic phonon polaritons confined to the subdiffraction limit exhibit encouragingly long lifetimes and group velocities as slow as 0.002c. Researchers use a time-resolved set-up sensitive to nanometre-scale optical fields to shed light on the exciting optical properties of hyperbolic materials.
Sustaining the ongoing revolution in optical microscopy will require gaining detailed insight into the optical fields in focal spots. Researchers have developed an elegant method for mapping the full electric vector field using just a metal nanosphere on a glass substrate.