Abstract:
A high aspect ratio gated emitter structure (10) and a method of making the structure are disclosed. Emitters (202) may be provided in a densely packed array on a support (100). Two distinct layers of insulator material (320, 340) may surround the emitters. The lower layer of insulator material (320) may be a non-conformally applied spray-on or spin-on insulator. The non-conformal insulator material (320) may pool at the base regions of the emitters so that the tip regions (210) of the emitters extend out of the lower layer of insulator material. The upper layer of insulator material (340) is applied to the lower layer using a conformal process so that the tip regions of the emitters are covered by the upper layer of insulator material. Gate material (400) is applied to the upper layer of insulator material. Holes are provided in the gate material over the tip regions and wells are provided in the upper layer of insulator material surrounding the tip regions. An etch resistant layer may optionally be provided between the upper layer of insulator material and the gate material.
Abstract:
A stable field-emission electron source that does not suffer from a current drop even after a high-current density operation for a long time is provided. The field-emission electron source includes: a substrate; an insulating layer that is formed on the substrate and that has a plurality of openings; cathodes arranged at the respective openings in order to emit electron beams; a lead electrode formed on the insulating layer in order to control emission of electrons from the respective cathodes; and a surface-modifying layer formed on the surface of each of the cathodes emitting electrons, comprising a chemical bond between a cathode material composing the cathodes and a material different from the cathode material.
Abstract:
A stable field-emission electron source that does not suffer from a current drop even after a high-current density operation for a long time is provided. The field-emission electron source includes: a substrate; an insulating layer that is formed on the substrate and that has a plurality of openings; cathodes arranged at the respective openings in order to emit electron beams; a lead electrode formed on the insulating layer in order to control emission of electrons from the respective cathodes; and a surface-modifying layer formed on the surface of each of the cathodes emitting electrons, comprising a chemical bond between a cathode material composing the cathodes and a material different from the cathode material.
Abstract:
A stable field-emission electron source that does not suffer from a current drop even after a high-current density operation for a long time is provided. The field-emission electron source includes: a substrate; an insulating layer that is formed on the substrate and that has a plurality of openings; cathodes arranged at the respective openings in order to emit electron beams; a lead electrode formed on the insulating layer in order to control emission of electrons from the respective cathodes; and a surface-modifying layer formed on the surface of each of the cathodes emitting electrons, comprising a chemical bond between a cathode material composing the cathodes and a material different from the cathode material.
Abstract:
An improved quadrupole mass spectrometer is described. The improvement lies in the substitution of the conventional hot filament electron source with a cold cathode field emitter array which in turn allows operating a small QMS at much high internal pressures then are currently achievable. By eliminating of the hot filament such problems as thermally “cracking” delicate analyte molecules, outgassing a “hot” filament, high power requirements, filament contamination by outgas species, and spurious em fields are avoid all together. In addition, the ability of produce FEAs using well-known and well developed photolithographic techniques, permits building a QMS having multiple redundancies of the ionization source at very low additional cost.
Abstract:
A field emission display backplate including a substrate having a surface; an emitter which extends from the surface of the substrate; and an anode having an upper surface, a lower surface, and an opening surface which defines an opening aligned with the emitter, the opening surface includes a first portion which curves outward relative to the anode and a second portion which curves inward relative to the anode.
Abstract:
An electron gun includes a field emission cold cathode (1) having a first electric potential, a primary gate electrode (2) having a first opening around the top of the cathode (1) and having a second electric potential which is higher than the first electric potential for causing an electron emission from the top of the cathode (1), and a second gate electrode (3) having a second opening around the top of the cathode (1) and having a third electric potential which is higher than the first electric potential and lower than the second electric potential, wherein a first voltage defined as a difference between the first and the second electric potentials varies in proportion to a second voltage defined as a difference between the first and the third electric potentials so as to provide a current-voltage characteristic having an apparent gamma-property. The apparent gamma-property is such that the luminous output of a fluorescent substance (7) of an anode (8) is directly proportional to a signal voltage.
Abstract:
A mechanically stable and oriented scanning probe tip comprising a carbon nanotube having a base with gradually decreasing diameter, with a sharp tip at the probe tip. Such a tip or an array of tips is produced by depositing a catalyst metal film on a substrate (10 & 12 in Fig. l(a)), depositing a carbon dot (14 in Fig. l(b)) on the catalyst metal film, etching away the catalyst metal film (Fig. l(c)) not masked by the carbon dot, removing the carbon dot from the catalyst metal film to expose the catalyst metal film (Fig. l(d)), and growing a carbon nanotube probe tip on the catalyst film (16 in Fig.l(e)). The carbon probe tips can be straight, angled, or sharply bent and have various technical applications.