“…3 Particularly, 1D subwavelength nanostructures including nanowires, 4–6 nanoslits, 7,8 nanochains 9,10 and grooves 11,12 have been applied in photonic integrated circuits, 13–15 nano/micro lasers, 16–18 photodetectors, 19 dichroic splitters, 20 planar lenses, 21 polarization switches, 22 displacement measurements, 23 spectrometers 24,25 and the asymmetric excitation of surface waves. 26,27 The properties of nanodevices are strongly related to the geometric size of nanowires such as in superconducting nanowire single photon detectors (SNSPDs), 28 quantum emitters 29,30 and luminescence spectrum of semiconductor nanowires, 31–33 so it is valuable to characterize the widths of nanowires and to study the interaction between incident light and nanowires.…”