Abstract
Instead of the conventional method of monitoring the transmitted light through a ferrofluid film, in this study we use ferrofluids as the guiding layer in a double metal-cladding optical waveguide structure, and measure the reflected light intensity to investigate the chain formation speed (switching speed) in ferrofluids. We conclude that the ultrahigh-order mode-induced optical trapping effect may be the main reason for the observed fast switching time which is increased by at least three orders of magnitude when a magnetic field was applied.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Nos. 10874121, 10874119, and 10474093) and the National Basic Research Program “973” of China (Contract No. 2007CB307000), and the Foundation for Development of Science and Technology of Shanghai (Grant No. 10JC1407200).
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Yuan, W., Yin, C., Xiao, P. et al. Microsecond-scale switching time of magnetic fluids due to the optical trapping effect in waveguide structure. Microfluid Nanofluid 11, 781–785 (2011). https://doi.org/10.1007/s10404-011-0844-z
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DOI: https://doi.org/10.1007/s10404-011-0844-z