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Brownian Transport Through Modulated Potential Energy Landscapes

Brownian Transport Through Modulated Potential Energy Landscapes David G. Grier, New York University, DMR-0451589. Walking the (Holographic) Line.

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Brownian Transport Through Modulated Potential Energy Landscapes

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  1. Brownian Transport Through Modulated Potential Energy Landscapes David G. Grier, New York University,DMR-0451589 Walking the (Holographic) Line Holographic optical traps use forces exerted by computer-generated holograms to trap and move microscopic objects. A new type of computational holography developed for this program transforms point-like optical traps into tailor-made lines of light. These specially structured beams focus as conical wedges and create a near-ideal one-dimensional potential energy landscapes. Released on these landscapes, microscopic objects perform a thermally-driven dance that maps out their mutual interactions with unprecedented accuracy and speed. 5 m Experimental reconstruction of a holographic line trap’s three-dimensional intensity pattern, I (r ), together with a microscope image of micrometer-diameter colloidal spheres assembled on the line. Roichman & Grier, Opt. Lett.31, 1675 (2006)

  2. Brownian Transport Through Modulated Potential Energy Landscapes David G. Grier, New York University,DMR-0451589 Education: Five undergraduate REU students (Andrea Martin, Karen Kasza, Meeri Kim, Emily Gardel and Alex Waldron) have contributed to this program. Four currently are graduate students in physics, and another is a sophomore at Harvard. Of the graduate students who pioneered this technique, Brian Koss and Kosta Ladavac are postdocs at NRL and Schlumberger, respectively. Jennifer Curtis is an assistant professor at Georgia Tech, Eric Dufresne is an assistant professor at Yale and Pamela Korda is a senior scientist at Arryx, Inc. Two postdocs, two graduate students, an undergraduate and a high school student are involved in this program. Broader Impact: Holographic optical trapping, developed with DMR support, offers unprecedented control over the mesoscopic world. Applications range from surgery within living cells to to rapidly sorting fluid-borne objects with unparalleled selectivity. This award-winning technology has been commercialized and is being rapidly adopted for a wide range of industrial applications, including manufacturing of photonic devices.

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