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. 2015 Jul 14;2(11):1500130. doi: 10.1002/advs.201500130

Figure 4.

Figure 4

a) Schematic of the exciton conversion from TPI to ADN at the junction interface. b) Bright‐field and PL microscopy images obtained from a single “H”‐like heterostructure recorded by exciting the TPI nanowire with a focused laser. Ex: the excitation spot. Scale bar is 10 μm. c) The corresponding PL spectrum collected from the junction part marked with the white square in (b). The spectrum can be fitted to the emissions of the TPI and ADN nanowires. d) Schematic illustration for the design of a light‐controlled photoswitch. The output optical signal can be modulated by changing the control laser based on the exciton conversion from TPI to ADN. e) PL microscopy images of the “H”‐like heterostructure excited with a constant input laser power (P I = 0.2 μW) and a control power of 0 (left), 0.2 μW (right), respectively. f) PL spectra collected from the output channel, which is marked as “O off” for P C = 0, and “O on” for P C = 0.2 μW. The blue dashed line represents the threshold. Inset: The cyclic on/off switching behavior of the ports “O on” and “O off.” The white dashed lines in (b) and (e) are guides for eye to show the position of the structures.