Diffraction of 0.5keV electrons from free-standing transmission gratings.
A nanostructured grating was used to diffract a low-energy (500 eV) electron beam, and the current transmitted into the zeroth diffraction order was greater than 5% of the incident beam current. This diffraction efficiency indicates that the 55-nm-wide grating bars absorb electrons but the 45-nm-wide slots between bars transmit electron de Broglie waves coherently. The diffraction patterns can be asymmetric, and can be explained by a model that incorporates an electrostatic potential energy for electrons within 20 nm of the grating structure calculated by the method of images.
McMorran
Ben
B
Department of Physics, University of Arizona, 1118 E. 4th St, Tucson, AZ 85721, USA. mcmorran@physics.arizona.edu
Perreault
John D
JD
Savas
T A
TA
Cronin
Alex
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