Development of a fast electromagnetic beam blanker for compressed sensing in scanning transmission electron microscopyDevelopment of a fast electromagnetic beam blanker for compressed sensing in scanning transmission electron microscopy
Faculty of Sciences. Physics
Electron microscopy for materials research (EMAT)
2016New York, N.Y. :American Institute of Physics, 2016
Applied physics letters / American Institute of Physics. - New York, N.Y., 1962, currens
108(2016):9, p. 1-5
University of Antwerp
The concept of compressed sensing was recently proposed to significantly reduce the electron dose in scanning transmission electron microscopy(STEM) while still maintaining the main features in the image. Here, an experimental setup based on an electromagnetic beam blanker placed in the condenser plane of a STEM is proposed. The beam blanker deflects the beam with a random pattern, while the scanning coils are moving the beam in the usual scan pattern. Experimental images at both the medium scale and high resolution are acquired and reconstructed based on a discrete cosine algorithm. The obtained results confirm that compressed sensing is highly attractive to limit beam damage in experimental STEM even though some remaining artifacts need to be resolved.