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Researchers Achieve New Control of Useful Long-Wavelength Radiation
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Researchers Achieve New Control of Useful Long-Wavelength RadiationPhysicists Aaron Lindenberg and Haidan Wen of the PULSE Institute for Ultrafast Energy Science have discovered a new mechanism for manipulating terahertz radiation fields, which are widely used in materials characterization, chemical sensing and noninvasive imaging. This work provides a new means for controlling the polarization of light at terahertz frequencies and represents a novel tool to help both reveal and direct ultrafast processes in materials. This work was published in Physical Review Letters on July 7. "Our experiments have implications on both fundamental and applied research," Wen said. First, Wen said, the work helps researchers to understand the physics of generating terahertz radiation, making it possible to create more intense fields. Second, he said, the work provides a means to adjust terahertz polarization, which has not been possible before. "This new research frontier known as plasma photonics has attracted great attention recently," Wen added. A similar result using a different experimental approach was reported by a research team from the Rensselaer Polytechnic Institute in the same issue of Physical Review Letters. Terahertz radiation, characterized by long wavelength and low photon energy, lies at the opposite extreme of the electromagnetic spectrum with respect to X-rays. It has been used as a tool for characterizing materials for decades, but until recently scientists have not been able to generate terahertz radiation at intensities high enough to alter material properties. Read more... Update:
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