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Scientists show that spatiotemporal focusing and compression of non-Fourier-limited pulses through scattering media can be achieved by manipulating only the spatial degrees of freedom of the incident wavefront. This technique is potentially attractive for optical manipulation and nonlinear imaging in scattering media.

Classical physics enabled subdiffraction-limited imaging has rarely been extended to the quantum regime. Here, Israelet al. develop a super-resolution localization microscopy based on non-classical photon statistics, enabling optical tracking of multiple quantum emitters.

2D Raman spectroscopy, based on fifth-order optical nonlinearity, is performed with a single beam of shaped fs optical pulses. The scheme inherently eliminates the cascade signal, making the vibrational coupling information easy to extract.

The quantum concepts of entanglement and interaction-free measurements are applied to spectroscopy to successfully sense carbon dioxide in air.

The demonstration of all-optical switching by confining light and cold rubidium atoms in a hollow-core photonic band-gap fibre may help bring the goal of single-photon switching closer to reality.

Lasers known as frequency combs have been used to generate molecular spectra from samples within microseconds and with high spatial resolution. This offers fresh prospects for making microscopy observations in real time. See Letter p.355

The effects of interactions on Hanbury Brown and Twiss interferometry are studied by considering the propagation of light in a nonlinear optical medium. The interactions affect the multipath interference, which makes it difficult to extract information about the light source. Nevertheless, the recovery of the disordered information is demonstrated through proper analysis.

The self-organization of many laser modes in phase and frequency realized by minimizing radiation losses in a cavity enables the complex wavefront required to focus light scattered by turbid samples to be generated on sub-microsecond timescales without employing electronic feedback, spatial light modulators or phase-conjugation crystals.

Structures with dimensions of 28 nm have been produced in semiconducting polymers using a thermochemical approach to patterning.

Researchers show that wavefront shaping enables not only real-time widefield imaging through turbid layers with both coherent and incoherent llumination, but also the imaging of objects outside the line-of-sight using light scattered from diffuse walls.

Laser pulses can be generated such that their shape and state of polarization change on the scale of a few femtoseconds, adding a new twist to the control and manipulation of molecules.

Ultrashort laser pulses allow physicists and chemists to watch fast molecular motion as it happens. But many fundamental atomic processes are even faster and require the shortest pulses ever created.

Characterizing not only the fluorescence intensity but also the inherent quantum correlations of the fluorescent photon stream can enhance the spatial resolution of image scanning microscopy up to twofold, a fourfold improvement over the diffraction limit.

Following an impulsive laser excitation of a single molecule, a dispersed vibrational wave-packet is partially rephased by a second pulse, and a wave-packet echo is observed. This wave-packet echo probes ultrafast intramolecular processes in the isolated molecule.

The Anderson localization of light within disordered media has become a topic of great interest in recent years. Here the characterization of the effect and its related phenomena are reviewed, with a discussion on the role that nonlinearity and quantum correlated photons can play.