| 摘要 |
<p>A device 100 for imparting an orbital angular momentum to a charged particle wave, preferably an electron wave, propagating along an axis 105 in a charged particle beam generating apparatus, the device comprising: a first conductive element 110 comprising a plurality of angularly spaced electrical conductors 112 arranged around the axis 105; a second conductive element 120 spaced apart from the first conductive element 110 along the direction of said axis 105; and a connecting means 130 for supplying a potential difference over said first conductive element 110 and said second conductive element 120. The connecting means 130 is adapted for supplying an electrical potential to said plurality of angularly spaced electrical conductors 112 for inducing an angular gradient of the phase of the charged particle wave when transmitted along said axis 105, in which the projection along the axis 105 of the electrical potential varies as function of an angular position with respect to the axis 105.</p> |
