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. 2017 Mar 13;7:44240. doi: 10.1038/srep44240

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(a) DC source-drain current i_SD (photo-current mode) and source-drain voltage Δu_SD (photovoltaic mode) in 20 × 20 μm² aperture probes as functions of the total power from the 3.4 THz QCL focused on the probe. (b) The inset shows a THz image of the focused QCL beam, detected by the NW-detector in (a). The main panel shows the THz beam intensity profile (red line) along the vertical axis measured by the NW-based detector with a 20 μm input aperture. The dashed black line shows a Gaussian fit I_THz = I₀exp(−(y²/(2r²)), where r = 83.5 μm.