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<p>an electron. Thickness-modulated <a href="page.php?w=silicon_nitride">silicon nitride</a> membranes and programmable phase shift devices have exploited these properties to apply spatially varying phase shifts to control the far-field spatial intensity and phase of the electron wave. Devices like these have been applied to arbitrarily shape the electron wavefront, correct the <a href="page.php?w=Optical_aberration">aberrations</a> inherent to <a href="page.php?w=electron_microscopes">electron microscopes</a>, resolve the <a href="page.php?w=Orbital_angular_momentum_of_free_electrons">orbital angular momentum of a free electron</a>,</p><p>
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