Abstract:
A device (100) for imparting an orbital angular momentum to a charged particle wave propagating along a beam axis (104) in a charged particle beam generating apparatus is described. The device comprises a support element (106) having a target region (108) adapted for transmitting a charged particle wave propagating along a beam axis (104) and an induction means (112) for inducing a magnetic flux along an elongated profile having a free end portion located in said target region (108) and the induction means (112) is adapted for providing a magnetic flux in said elongated profile in order to induce an angular gradient, relative to the beam axis (104), of the phase of the charged particle wave when transmitted through said target region (108). A corresponding method is also disclosed, as well as the use thereof in electron microscopy.
Abstract:
전계 방출원은, 나노 크기의 전자 방출 물질을 포함하는 것으로 제1면과 그 반대 면인 제2면을 가지는 전자방출필름 그리고 상기 전자방출필름의 일단부를 고정하는 것으로 상기 전자방출필름의 제1면과 제2면에 각각 대응하는 제1블록과 제2블록을 포함하는 캐소드; 를 구비한다.
Abstract:
An embodiment includes an electron beam source system having a first electron beam source unit with a substrate having a substrate-top end and a substrate-bottom end; and a first lens coupled to the substrate-bottom end defining a first aperture and having a lens-top end and a lens-bottom end. Further embodiments comprise an electron-emission region at the substrate-bottom end and aligned with the first aperture, the electron-emission region being operable to emit one or more electrons due to one or more photons contacting the electron-emission region, which may include passing through the substrate and into the electron-emission region, wherein the electron- emission region comprises a first doped portion of the substrate.
Abstract:
In a particular embodiment, a method is disclosed that includes exciting one or more surface acoustic waves (SAW) on a surface of a piezoelectric substrate of a photocathode of a photoinjector using one or more interdigital tranducers (IDT). The method also includes optically generating electrons (e) and holes (h) in the photocathode using an incident laser beam. The method also includes changing at least one of a recombination probability and a recombination rate of at least some electrons (e) and holes (h) in the photocathode producing a high-current electron gun having an increased beam brightness, which is a ratio of electron beam current to electron beam emittance, due to at least one of a decreased electron beam emittance of electrons photoemitted from the photocathode of the photoinjector and an increased electron beam current. The method results in enhancing a quantum efficiency (QE) of photoemission by the photocathode of the photoinjector, leading to production of intense, low emittance electron bunches at a high repetition rate using laser excitation. Also disclosed are devices based on the disclosed method.
Abstract:
An embodiment includes an electron beam source system having a first electron beam source unit with a substrate having a substrate-top end and a substrate-bottom end; and a first lens coupled to the substrate-bottom end defining a first aperture and having a lens-top end and a lens-bottom end. Further embodiments comprise an electron-emission region at the substrate-bottom end and aligned with the first aperture, the electron-emission region being operable to emit one or more electrons due to one or more photons contacting the electron-emission region, which may include passing through the substrate and into the electron-emission region, wherein the electron- emission region comprises a first doped portion of the substrate.
Abstract:
Self-healing photocathode device comprising a photoemissive multi-alkali semiconductor comprising a multi-alkali antimonide having the formula AxBy C2Sb, where A, B and C are Group I alkali metals and x+y+z = 3; a nanostructured porous membrane, one surface of which is in direct contact with the multi-alkali semiconductor and the opposing surface of which is disposed toward the inside of a sealed reservoir, such that the porous membrane and the sealed reservoir form a volume which is maintained at low pressure; a temperature control means in contact with the porous membrane, wherein the temperature control means regulates the temperature of the porous membrane at 2000C or less; a source comprising elemental cesium which is releasable into the enclosed volume; and, a current conducting means attached to the source.
Abstract translation:包含具有式AxBy C2Sb的多碱锑化物的光发射多碱半导体的自愈合光电阴极装置,其中A,B和C是I族碱金属,x + y + z = 3; 纳米结构多孔膜,其一个表面与多碱半导体直接接触并且其相对表面设置在密封储存器的内部,使得多孔膜和密封储存器形成维持的体积 在低压下 与所述多孔膜接触的温度控制装置,其中所述温度控制装置将所述多孔膜的温度调节至200℃以下; 包含可释放到封闭容积中的元素铯的源; 以及附接到源的电流传导装置。
Abstract:
Vacuum microelectronic devices with carbon nanotube films, layers, ribbons and fabrics are provided. The present invention discloses microelectronic vacuum devices including triode structures that include three-terminals (an emitter, a grid and an anode), and also higher-order devices such as tetrodes and pentodes, all of which use carbon nanotubes to form various components of the devices. In certain embodiments, patterned portions of nanotube fabric may be used as grid/gate components, conductive traces, etc. Nanotube fabrics may be suspended or conformally disposed. In certain embodiments, methods for stiffening a nanotube fabric layer are used. Various methods for applying, selectively removing (e.g. etching), suspending, and stiffening vertically- and horizontally- disposed nanotube fabrics are disclosed, as are CMOS -compatible fabrication methods. In certain embodiments, nanotube fabric triodes provide high-speed, small-scale, low -power devices that can be employed in radiation-intensive applications.
Abstract:
Disclosed herein is a high frequency, cold cathode, triode-type, field-emitter vacuum tube including a cathode structure (12), an anode structure (13) spaced from the cathode structure (12), and a control grid (15), wherein the cathode structure (12) and the anode structure (13) are formed separately and bonded together with the interposition of spacers (14), and the control grid (15) is integrated in the anode structure (12).
Abstract:
L'invention concerne une structure de cathode de type triode comprenant, en superposition sur un support (41), une électrode de cathode (42), une couche d'isolant électrique (44) et une électrode de grille (45), la couche d'isolant électrique (44) et l'électrode de grille (45) présentant des ouvertures d'émission (46) révélant au moins un élément émetteur d'électrons (48) relié électriquement à l'électrode de cathode (42), la structure comprenant en outre une électrode de refocalisation disposée pour refocaliser les électrons extraits par l'électrode de grille (45). L'électrode de refocalisation (50) est disposée sur ladite couche d'isolant électrique (44) et est reliée à des moyens de connexion électrique permettant de lui appliquer une tension de refocalisation par l'intermédiaire de nanotubes électriquement conducteurs (58). Elle concerne également un dispositif à émission de champ à commande matricielle.
Abstract:
A method is provided for preventing electron emission from a sidewall (34) of a gate electrode (20) and the edge (28) of the gate electrode stack of a field emission device (10), the gate electrode (20) having a surface (24) distally disposed from an anode (40) and a side (26) proximate to emission electrodes (38). The method comprises growing dielectric material (22) over the surface (24) and side (26) of the gate electrode (20), and performing an anisotropic etch (32) normal to the surface (24) to remove the dielectric material (22) from the surface (24) and leaving at least a portion of the dielectric material (22) on the side (26) of the gate electrode (20) and edge (28) of the gate electrode stack.