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Tag archives: optics

Breaking the diffraction limit

The nanophotonics panel: Jennifer Dionne (left), Satoshi Kawata (middle) and Adarsh Sandhu

The nanophotonics panel: Jennifer Dionne (left), Satoshi Kawata (middle) and Adarsh Sandhu.

By Hamish Johnston

At first glance, visible light and nanotechnology seem incompatible because of the diffraction limit, which dictates that features smaller than about half the wavelength of light cannot be resolved optically. For visible light, the diffraction limit is about 300 nm and this means that there is no point in trying to make conventional optical components that are any smaller.

But that pessimistic outlook has changed over the past decade or so thanks to the development of nanophotonics, which makes use of near-field (or evanescent) light and plasmons to manipulate light on length scales much smaller than the diffraction limit. Today, nanophotonics is being used across a range of disciplines, including biological imaging, telecommunications, solar energy and semiconductor processing.

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Physics World 2014 Focus on Optics & Lasers is out now

By Matin Durrani

Physics World focus issue on optics and lasers 2014It’s time to tuck into the latest focus issue of Physics World, which explores some of the latest research into optics and lasers.

The focus issue, which can be read here free of charge, kicks off with a report from the Centre for Quantum Photonics at the University of Bristol in the UK, which is driving a new approach to quantum computing based on integrated photonic circuits.

Elsewhere in the issue, you can find out from Joel England, a physicist at Stanford University in the US, about the new photonic research that could see particle accelerators shrunk to the scale of microchips.

Meanwhile, the huge potential of the photonics sector in general is underlined in our keynote interview with the chief executive of Jenoptik, Michael Mertin, who is also president of the European Union’s Photonics21 consortium, which seeks to unify the European photonics community and advises the European Commission on photonics research, development and innovation needs.

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Stretching and spinning droplets using sound

Mirror made from tiny polystyrene spheres (Courtesy: Grzegorczyk et al Phys Rev Lett 112) 023902

Mirror made from tiny polystyrene spheres. (Courtesy: Grzegorczyk et al., Phys. Rev. Lett. 112 023902)

By Hamish Johnston

There are two fantastic papers in Physical Review Letters this week that made me smile. Both of them are about controlling macroscopic objects using waves. While there are practical applications for both techniques, I can’t help thinking that the authors did the work for the sheer joy of it.

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