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SEM image of Si NWs. The circle represents the laser beam at the focus. The zoom shows that only a few NWs (4 in this case) with different diameters are excited by the laser beam.
Raman spectra measured in air (a), and water (b). The laser power densities are 10 [only in (a)], 25, 50, and . The spectrum of the control sample is also shown in (b).
Calculated Raman spectra taking account of temperature (8 nm diameter).
Calculated maximum temperature induced by the laser beam in the region of the NWs under the laser excitation as a function of the NWs diameter for an incident laser power density of (Gaussian distribution). The inset shows the axial temperature distribution inside the area excited by the laser beam in a 20 nm diameter wire.
Experimental (dots) Raman spectrum of NWs in air (laser power density ), and calculated (line) spectrum considering wires with different diameters and their corresponding laser beam induced temperatures.
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