Universiteit Antwerpen

Johan Verbeeck

Gustaaf Van Tendeloo

Armand Béché

A device for locally manipulating a spatial phase distribution of a charged particle wave propagating along a beam axis comprises a support element having a target region for receiving the charged particle wave propagating along the beam axis and a plurality of phase adjusting elements, supported by the support element and located in the target region, for locally adjusting the phase of the charged particle wave when the charged particle wave impinges on the phase adjusting element. The device also comprises a plurality of control lines connected to the plurality of phase adjusting elements for individually controlling each phase adjusting element.

Spatial phase manipulation of charged particle beam

A device is arranged for imparting an orbital angular momentum to a charged particle wave propagating along an axis in a charged particle beam generating apparatus. The device includes a first conductive element comprising a plurality of angularly spaced electrical conductors arranged around the axis, and a second conductive element. The first and second conductive elements are spaced apart along the direction of the axis, and are adapted for transmitting a charged particle wave propagating along the axis. A connecting means is adapted for supplying an electrical potential to the plurality of angularly spaced electrical conductors for inducing an angular gradient of the phase of the charged particle wave when transmitted along the axis, in which the projection along the axis of the electrical potential varies as a function of an angular position with respect to the axis.

Generation of charged particle vortex waves

A device for imparting an orbital angular momentum to a charged particle wave propagating along a beam axis in a charged particle beam generating apparatus is described. The device comprises a support element having a target region adapted for transmitting a charged particle wave propagating along a beam axis and an induction means for inducing a magnetic flux along an elongated profile having a free end portion located in the target region and the induction means is adapted for providing a magnetic flux in the elongated profile in order to induce an angular gradient, relative to the beam axis, of the phase of the charged particle wave when transmitted through the target region. A corresponding method is also disclosed, as well as the use thereof in electron microscopy.

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Hever, Belgium

Johan Verbeeck