Patent ID: 8487268

Claim:
A method for the production of a phase plate ( 20 ) for installation in an electron microscope ( 1 ), comprising the steps: Providing of a manageable stable chip ( 32 ), wherein the chip ( 32 ) exhibits at least one thin self-supporting membrane ( 30 ) arranged in a membrane window ( 34 ) of the chip, said membrane defining a plane front ( 30 a ) of the chip, wherein the membrane remains in the form of a first insulating layer as part of the phase plate ( 20 ) to be generated, Application of an electric conductive first shielding layer ( 40 ) on a rear ( 30 b ) of the membrane opposite the front, Production of an electrode ( 52 ) and a lead ( 54 ) made of electric conductive material on the front of the membrane ( 30 a ), Milling out of an aperture opening ( 36 ) from the membrane ( 30 ) with recessing of an electrode carrier region ( 39 ) and at least one connecting element ( 38 ) as part of a suspension element ( 92 ) to be produced, wherein the electrode carrier region ( 39 ) is suspended on the connecting element ( 38 ), Application of an electric insulating second insulating layer ( 60 ) on the electrode carrier region ( 39 ) and the suspension element ( 92 ), so that the electrode ( 52 ) and at least partially the lead ( 54 ) are covered by the second insulating layer ( 60 ), wherein the electrode ( 52 ) and at least partially the lead ( 54 ) between the first and second insulating layer ( 30 , 60 ) are enclosed, Application of an electrical conducting second shielding layer ( 70 ) on the side of the second insulating layer ( 60 ) opposite the electrode, wherein the phase plate ( 20 ) is tilted and/or rotated in order to coat the lateral faces ( 91 , 93 ) of the electrode carrier region ( 39 ) and at least partially the suspension element ( 92 ) with the electric conductive material of the second shielding layer, wherein an electric contact between the first and second shielding layer ( 40 , 70 ) is produced, as a result of which the first and second shielding layers form a closed electric shielding cage around the electrode ( 52 ) and at least partially the lead ( 54 ) and the shielding cage is electrically insulated from the electrode ( 52 ) by means of the first and second insulating layers ( 30 , 60 ), Subsequent boring through of the phase plate ( 20 ) in the region of the electrode ( 52 ), wherein the inner opening ( 80 ) in the electrode is produced with a diameter between 1 nm and 100 μm, so that in the process the ring shape of the electrode ( 52 ) comes into being and the layers of the lens arrangement are exposed to the bore ( 80 ).