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. Author manuscript; available in PMC: 2016 Sep 16.
Published in final edited form as: Small. 2015 Jul 3;11(35):4423–4444. doi: 10.1002/smll.201500970

Figure 4.

Figure 4

(a) Schematic illustration of an electrical switch based on photothermal control of fluid flow in the capillary tube (3). The capillary tube was inserted into a PDMS block (2) capped on a 5 mL glass vial. The batteries (5) were connected in series to a standard LED light bulb (6) with standard copper wires (4 in red). There was a gap between the two copper wires. When the vial was irradiated with a laser beam (7), the solution expanded, filled the capillary tube, and bridged the gap between the two copper wires, turning on the LED bulb. (b) Experimental demonstration of the on–off reversible photoswitching of an LED. Reprinted with permission from ref. 47. Copyright (2013) Wiley-VCH.