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Fig. 5 | Advanced Structural and Chemical Imaging

Fig. 5

From: Investigation of hole-free phase plate performance in transmission electron microscopy under different operation conditions by experiments and simulations

Fig. 5

Comparison of experimental and simulated image intensities of CNT bundles for an HFPP operated under case B conditions (\(\varphi_{\text{PP}} \left( 0 \right) = - 0.8 \pi\)). a HFPP TEM image showing two CNT bundles of different sizes. b First approximation of phase-shifting profile \(\varphi_{\text{PP}} \left( q \right)\) from Fig. 2b with linear interpolation between the experimental data points (blue dots). c Experimental intensity line profiles (black) along the arrows in (a) and simulated intensity (green) for the phase shift profile shown in (b) do not agree well. The data for the small CNT bundle is shifted upwards by 0.3 for better visibility. d Phase shift profile with additional points (red) after optimization of \(\varphi_{\text{PP}} \left( q \right)\) by a fit routine and zoom-in for low \(q\). The right branch of \(\varphi_{\text{PP}} \left( q \right)\) is elongated by \(0.002\;{\text{nm}}^{ - 1}\) to describe HFPP drift during exposure. e Experimental and simulated image intensities obtained with the phase shift profile in (d) are in a very good agreement. Including drift in \(\varphi_{\text{PP}} \left( q \right)\) explains different halo intensities on the left and right sides of the CNT bundles

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