News tagged with index of refraction
The new world of gamma-ray optics
Scientists discover that certain materials like silicon or gold exhibit a surprisingly large refractive index for extremely high energetic gamma-rays.
May 14, 2012 |
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Novel link between optical fibers, nanometer-scale silicon structures could aid development of integrated optical circui
Silicon is a unique material that has revolutionized electronics; it enables engineers to put millions of electrical devices onto a single chip. Replacing the electrical currents in this technology with beams ...
Feb 17, 2012 |
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Study resolves century-long debate over how to describe electromagnetic momentum density in matter
(PhysOrg.com) -- Researchers from the NIST Center for Nanoscale Science and Technology and the University of British Columbia have shown that the interaction between a light pulse and a light-absorbing object, including the ...
Dec 29, 2011 |
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Carbon nanotube forest camouflages 3-D objects
Carbon nanotubes, tiny cylinders composed of one-atom-thick carbon lattices, have gained fame as one of the strongest materials known to science. Now a group of researchers from the University of Michigan ...
Nov 21, 2011 |
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New metamaterial allows transmission gain while retaining negative refraction property
A new type of active metamaterial that incorporates semiconductor devices into conventional metamaterial structures is demonstrating an ability to have power gain while retaining its negative refraction property, a first ...
Nov 09, 2011 |
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In a major breakthrough, scientists control light propagation in photonic chips
Researchers at Columbia Engineering School have built optical nanostructures that enable them to engineer the index of refraction and fully control light dispersion. They have shown that it is possible for light (electromagnetic ...
Jul 10, 2011 |
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Invisibility carpet cloak can hide objects from visible light
(PhysOrg.com) -- Most of the invisibility cloaks that have been demonstrated to date conceal objects at frequencies that are not detectable by the human eye. Designing invisibility cloaks that can conceal ...
Jun 15, 2011 |
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Newly developed cloak hides underwater objects from sonar
In one University of Illinois lab, invisibility is a matter of now you hear it, now you don't.
Jan 05, 2011 |
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New findings promising for 'transformation optics,' cloaking
Researchers have overcome a fundamental obstacle in using new "metamaterials" for radical advances in optical technologies, including ultra-powerful microscopes and computers and a possible invisibility cloak.
Aug 04, 2010 |
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Researchers analyze performance of first updatable holographic 3D display
(PhysOrg.com) -- In 2008, researchers from the University of Arizona created a holographic 3D display that could write and erase images, making it the first updatable (or rewritable) holographic 3D display ...
May 26, 2010 |
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Beyond the looking glass...
While the researchers can't promise delivery to a parallel universe or a school for wizards, books like Pullman's Dark Materials and JK Rowling's Harry Potter are steps closer to reality now that researchers ...
Aug 13, 2009 |
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Measuring the Speed of Light in Composite Materials
(PhysOrg.com) -- Although the speed of light is constant in a vacuum, light slows down a small amount when traveling through other materials. While it's relatively easy to measure the speed of light in mediums ...
Aug 02, 2009 |
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