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An integrated fiber-based optical trap for single airborne particles

An integrated fiber-based optical trap for single airborne particles,10.1007/s00340-010-4339-5,Applied Physics B-lasers and Optics,M. Horstmann,K. Pro

An integrated fiber-based optical trap for single airborne particles  
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We present a compact fiber-based optical airborne particle trap that is integrated on a microscope slide. Light guided in a short glass capillary is used to inject micron-sized droplets into an optical trap formed by the same light and a counterpropagating beam emanating from a single-mode optical fiber. The glass capillary ensures separation of trapped particles from remaining aerosol in the injection chamber. Permanent alignment of the fibers and the capillary allows for adjustment-free operation. Mie resonances arising in the radiation pressure exerted on trapped droplets are detected via a position stabilization feedback loop and are used to precisely determine the size evolution of trapped glycerol–water droplets.
Journal: Applied Physics B-lasers and Optics - APPL PHYS B-LASERS OPT , vol. 103, no. 1, pp. 35-39, 2011
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