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. 2016 Sep 7;6:32840. doi: 10.1038/srep32840

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Simulation results of electric potential distribution for (a) OET device without metallic microsphere, (b) OET device with a metallic microsphere at the left edge of the trap but without shadow effect, and (c) OET device with a metallic microsphere at the left edge of the trap and with shadow effect. Simulation results of electric field distribution for (d) OET device without metallic microsphere, (e) OET device with a metallic microsphere at the left edge of the trap but without shadow effect, and (f) OET device with a metallic microsphere at the left edge of the trap and with shadow effect.