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Focusing into a scattering medium is much more valuable than focusing through it. Scientists now demonstrate the dynamic focusing of light into a scattering medium by combining the ultrasonic modulation of diffused coherent light with optical phase conjugation.
Highly sensitive absorption spectroscopy is used to image the presence of single molecules through their weak optical absorption signatures. Measurements are demonstrated at mutiple wavelengths and scanned over a 2D area to create spatial maps of absorption.
Researchers demonstrate an X-ray holography method that records two independent images spaced by a femtosecond variable time delay. The concept overcomes the time limitations of two-dimensional area detectors by superimposing the separable X-ray holograms in a single detector exposure.
Laser spectroscopy based on the nonlinear photothermal and photoacoustic spectral resonances of nanoparticles is demonstrated. This approach will be potentially useful for applications such as multispectral imaging, multicolour cytometry, and the study of laser–nanoparticle interactions at a resolution beyond the spectral limit.
Researchers propose a new type of multiphoton entangled state and demonstrate its working principles of measurement-based quantum computation in correlation space. With four- and six-qubit states, they realize a universal set of single-qubit rotations, two-qubit entangling gates and further Deutsch's algorithm.
The advent of ophthalmic imaging instruments equipped with adaptive optics technology now makes it possible to visualize the retina at the cellular level, allowing the early detection of eye diseases.
Adaptive optics has a huge range of applications. Nadya Anscombe talks to Robert Tyson, associate professor at the University of North Carolina at Charlotte in the USA, to find out his views on its future.
When AOptix Technologies was set up in 2000 to exploit adaptive optics in laser communications systems, its future looked bright. But, as Nadya Anscombe finds out, the company has had to adapt to changes in the market and find new applications for its technology.
Microelectromechanical systems (MEMS) technology has allowed the realization of cost-effective, high-performance deformable mirrors for adaptive-optics-enhanced imaging.
