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SEM images of (a) the as-prepared SiNWs, and (b) the cross section of the fiber along its axis. The inset shows a SiNW fiber.
PL spectra of (a) an ensemble of as-prepared random-oriented SiNWs and (b) a SiNW fiber recorded at two perpendicular polarization angles with the strongest and weakest PL intensity; (c) and (d) Gaussian deconvolution of the intense and weak PL spectrum, respectively, in b. Three elementary bands with maxima at 565–580, 605–640, and are required to produce a composite curve (shown as the dashed line) to fit the experimental data.
Total PL intensity as a function of polarization angle. The solid line is a fit to , showing the 180° periodicity. The inset shows the total PL intensity and intensity of the component PL band as a function of polarization angle, revealing similar angular dependence.
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