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Schematic diagram of the optical trap based on microstructured silicon substrates.
(a) and (b) SEM images (viewed at 45°) of laser microstructured silicon substrates, corresponding to different laser fluences. Inset: magnified view of a silver-coated substrate.
Trapping force on 900-nm polystyrene beads as a function of laser power for various substrates. The different substrates are: (a) the laser microstructured silicon sample shown in Fig. 2(a) with well-formed microspikes, coated with a 80-nm silver layer (squares), (b) the laser microstructured silicon sample shown in Fig. 2(b), coated with a 80-nm silver layer (circles), (c) a flat, unprocessed silicon wafer, coated with a 80-nm silver layer (triangles), and (d) a laser microstructured silicon sample with well-formed microspikes, without a silver layer (diamonds).
Effective trapping quality factor, Q, for various substrates.
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