| Title | New, Ultrathin Optical Devices Shape Light in Exotic Ways | |
| Date | Saturday September 05 2015, @01:04AM | |
| Author | cmn32480 | |
| Topic | ||
| from the engage-the-cloaking-device dept. | ||
Researchers have developed innovative flat, optical lenses as part of a collaboration between NASA's Jet Propulsion Laboratory and the California Institute of Technology, both in Pasadena, California. These optical components are capable of manipulating light in ways that are difficult or impossible to achieve with conventional optical devices.
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Seen under a scanning electron microscope, the new metasurfaces that the researchers created resemble a cut forest where only the stumps remain. Each silicon stump, or pillar, has an elliptical cross section, and by carefully varying the diameters of each pillar and rotating them around their axes, the scientists were able to simultaneously manipulate the phase and polarization of passing light.Phase has to do with the separation between peaks of light waves; light waves in phase with each other combine to produce a single, more powerful wave. Manipulating its phase influences the degree to which a light ray bends, which in turn influences whether an image is in or out of focus. Polarization refers to the way some light waves vibrate only in a particular direction, whereas waves in natural sunlight vibrate in all directions. Manipulating the polarization of light is essential for the operation of advanced microscopes, cameras and displays; the control of polarization also enables simple gadgets such as 3-D glasses and polarized sunglasses.
Metamaterials promise a wide range of applications from better solar cells and sensors to invisibility cloaks.
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