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Fig. 1. (a) Schematic drawing (not to scale) of an optical trap utilizing a 1-D periodic nanostructure (aluminum grating on glass) to enhance the trapping potential by as much as an order of magnitude and allow rotation/alignment of nonspherical but non-birefringent particles. The enhancement is derived from interaction of polarized low-intensity laser beam with the grating. (b) The irradiance distribution of light (wavelength 633 nm) with two orthogonal polarizations at the surface of a grating with the 417 nm period obtained by using FDTD calculations. The distribution is normalized to the irradiance on a flat aluminum surface. The asymmetric distribution of the trapping field causes alignment of non-birefringent nonspherical dielectric particles perpendicular to the grating grooves. The figure reproduced by permission from Wilson BK et al 2010 with minor modifications. [LYL] |
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