Fig. 1. Experimental flow of femtosecond laser connection CuO nanowires. (a) Dispersing CuO nanowires on PDMS; (b) target location selection under light mirror; (c) pressing down PDMS to substrate surface; (d) removal of nanowires by heating; (e) repeat (a)--(d) to form joint; (f) laser irradiation

Fig. 2. Experimental apparatus for femtosecond laser fixed point nanojoining

Fig. 3. Morphology of CuO nanowires. (a) CuO nanowires grown; (b) CuO nanowires on lower surface of PDMS, illustrated as dark field image; (c) TEM characterization results of CuO nanowires; (d) (111) plane of CuO

Fig. 4. Nanojoining process and element distribution of CuO nanowires under femtosecond laser. (a) Untreated CuO nanowires; (b) distribution of copper elements on material surface; (c) distribution of oxygen elements on material surface; (d) CuO nanowires after connection; (e) damaged nanowires; (f) partially fractured nanowires

Fig. 5. Light field simulation results before and after CuO nanowire nanojoining. (a) Two CuO nanowires perpendicular to each other; (b) two CuO nanowires parallel to each other; (c) electric field intensity near contact point at different nanowire angles

Fig. 6. Electrical properties of single CuO nanowire. (a) Schematic of electrical measurement of single CuO nanowire; (b) electrical response range of CuO nanowires;(c) back-gate response of CuO nanowires; (d) back-gate response in logarithmic coordinates

Fig. 7. Electrical properties of interconnection of CuO nanowires. (a) Schematic of electrical measurement of CuO nanowire interconnection; (b) interconnection enhancement curves of CuO nanowires under action of laser; (c) gradual damage curves of CuO nanowires subjected to laser; (d) regulation performance of nanowire gate after nanowire connection

Fig. 8. Performance curves of photodetector based on CuO nanowires. (a) Photoelectric response of single CuO nanowires under different light intensities and different voltages; (b) photoelectric response of single CuO nanowire with different light intensities over time; (c) comparison of device performance before and after laser nanojoining; (d) photoelectric response of device after laser nanojoining