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Advanced filters: Author: Ulf Leonhardt Clear advanced filters

  • Combining Maxwell's equations with Einstein's general relativity promises perfect images and cloaking devices, explains Ulf Leonhardt.

    • Ulf Leonhardt
    Comments & Opinion
    Nature
    Volume: 471, P: 292-293

  • Massive objects in space act as gravitational lenses, bending and focusing light. Scientists have now created a photonic analogue of a gravitational lens on a chip, and have shown that it is strong enough to force light into orbits.

    • Ulf Leonhardt
    News & Views
    Nature Photonics
    Volume: 7, P: 856-858

  • For time immemorial, clothes have been used for thermal insulation. Cloaking devices have now been demonstrated that insulate from heat while maintaining its flow, thus hiding objects from heat sensors.

    • Ulf Leonhardt
    News & Views
    Nature
    Volume: 498, P: 440-441

  • Ever since invisibility cloaking has left the realm of fiction and been demonstrated for microwave radiation, cloaking in the visible has been the aim. Having reached the near-infrared, we might be there soon.

    • Ulf Leonhardt
    News & Views
    Nature Materials
    Volume: 8, P: 537-538

  • Metamaterials allow the design of new functionality through the engineered control of light propagation, although broadband operation with these materials requires singularities in their refractive index. As a first example of a technique that uses a topological defect to achieve such behaviour in a real system, an omnidirectional metamaterial retroreflector is demonstrated.

    • Yun Gui Ma
    • C. K. Ong
    • Ulf Leonhardt
    Research
    Nature Materials
    Volume: 8, P: 639-642

  • Cloaking devices for visible light come a step closer to reality by combining the modern form of a Roman technology with ideas from ancient Greece.

    • Ulf Leonhardt
    News & Views
    Nature Photonics
    Volume: 1, P: 207-208

  • Using transformation optics, researchers predict that birefringent dielectrics can be engineered to control both polarizations of light independently. They also show that structures can be designed to allow light to pass through as if the birefringence did not exist at all.

    • Aaron J. Danner
    • Tomáš Tyc
    • Ulf Leonhardt
    Research
    Nature Photonics
    Volume: 5, P: 357-359

  • How much momentum does light transfer to a material through which it passes? This is a surprisingly opaque matter, contested for almost a century, that is still the object of theory and experimentation.

    • Ulf Leonhardt
    News & Views
    Nature
    Volume: 444, P: 823-824