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X-ray, Optical Wave Mix Probes Atomic-Scale Light

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BERKELEY, Calif., Aug. 31, 2012 — A long-awaited technique for watching how light interacts with matter on the atomic scale was demonstrated by mixing x-ray and optical lightwaves. Vision, photosynthesis and solar cells are a few examples of the ways light changes matter, but how light makes those changes hasn't been measured on the atomic scale until now. Simulated valence-charge density from x-ray and optical wave-mixing shows the nuclei of carbon atoms as dark spots revealed by diffracted x-rays and the peaks of some of the bonds between them as white and blue spots induced by the polarized optical pulse. In diamond,...Read full article

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    Published: August 2012
    Glossary
    diffraction
    As a wavefront of light passes by an opaque edge or through an opening, secondary weaker wavefronts are generated, apparently originating at that edge. These secondary wavefronts will interfere with the primary wavefront as well as with each other to form various diffraction patterns.
    light
    Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
    x-ray diffraction
    The bending of x-rays by the regular layers of molecules in a crystal acting like a very small diffraction grating. The diffraction pattern so obtained and recorded on film provides a means for analyzing the crystal structure.
    AmericasLEDsatomic scaleBasic ScienceBerkeley LabCaliforniacrystalsdiamonddiffractionenergyEuropeFELfree electron lasergreen photonicsJerome HastingsLasersLawrence Berkeley National LaboratoryLCLSlightlight changes matterLight SourcesLinac coherent light sourceoptical interactionsoptical pulseoptical waveOpticsphase transitionphoton energyphotosynthesisResearch & TechnologySensors & DetectorsSLAC National Acceleratorsolar cellssum frequency generationsynchronized wavesTest & MeasurementThornton Glovervalence electronsx-rayx-ray diffraction

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