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Nano-Sized Light Mill Drives Microdisk

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BERKELEY, Calif., July 8, 2010 — Researchers have created the first nano-sized light mill motor whose rotational speed and direction can be controlled by tuning the frequency of the incident light waves. STM image shows a gammadion gold light mill nanomotor embedded in a 300 nanometers thick square-shaped silica microdisk. The inset shows a magnified top view of the light mill. (Image: Zhang group) According to the group with the US Department of Energy’s (DoE) Lawrence Berkeley National Laboratory (LBNL) and the University of California (UC) Berkeley, this new light mill will open the door to a broad range...Read full article

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    Published: July 2010
    Glossary
    gaussian beam
    A beam of light whose electrical field amplitude distribution is Gaussian. When such a beam is circular in cross section, the amplitude is E(r) = E(0) exp [-(r/w)2], where r is the distance from beam center and w is the radius at which the amplitude is 1/e of its value on the axis; w is called the beamwidth.
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    optical tweezers
    Optical tweezers refer to a scientific instrument that uses the pressure of laser light to trap and manipulate microscopic objects, such as particles or biological cells, in three dimensions. This technique relies on the momentum transfer of photons from the laser beam to the trapped objects, creating a stable trapping potential. Optical tweezers are widely used in physics, biology, and nanotechnology for studying and manipulating tiny structures at the microscale and nanoscale levels. Key...
    Americasano-sized light millBasic Sciencebiological applicationsBiophotonicscoherent arraysDNA double helixDOE Office of Scienceenergygammadion-shaped lightGaussian beamgreen photonicsGuy Bartallaser powerLawrence Berkeley National LaboratoryLC-circuitslight and matterLight Sourceslight waveslinearly polarized lightmetallic nanostructuremicrodiskmicrometer-sized silica diskMing Liunanonanomotornanoscale solar light harvestersnanoscopic systemsNEMSoptical trapsoptical tweezersplanar gammadio gold structureplasmonic motorResearch & Technologysilica microdiskSolar EnergysunlightThomas ZentgrafUniversity of California BerkeleyUS Department of EnergyXiang ZhangYongmin LiuLEDs

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