摘要:
Uniform illumination of a two dimensional area, such as a lithographic mask, is provided. The fan-like input beam : (50) is sent to a mirror (52), which it strikes at a grazing angle and is then reflected to the area to be illuminated. Collimation occurs to reduce the divergence of the beam in order to increase its intensity. By changing the grazing angle between the reflected beam (50) and the mirror (52) by a small amount, the reflected beam (54) will be swept across the two dimensional area. The angle is changed at a non-uniform rate which is a function of time, and is chosen so that substantially uniform illumination occurs at all points in the area to be illuminated. A particular embodiment uses a divergent x-ray beam from a synchrotron source. The divergent beam strikes a cylindrical mirror, which collimates it and directs the reflected beam to an x-ray mask plane. The mirror is moved with a nonlinear velocity in order to provide substantially uniform illumination of the mask area, and substantially uniform heating across the mask plane.
摘要:
A shutter (26) is positioned in the path of radiation from a pulsed electromagnetic radiation source (10) at a distance sufficiently far from the source such that an emitted pulse of electromagnetic radiation and the debris simultaneously discharged with the pulse become spatially separated from each other and arrive at the shutter (26) at different times due to the inherent difference in propagation speed of the debris and pulse. Movement of the shutter is synchronized with generation of an electromagnetic pulse such that the pulse encounters an open shutter and passes on through a window (16) to expose a microcircuit wafer while the slower travelling debris simultaneously launched with the pulse encounters a closed shutter.
摘要:
In electron beam testing systems wherein high energy, 'high resolution electron beams 14 are used to test litho- tgraphic masks 16, a technique and apparatus is described for discharging electrons which are left on the surface of the mask. The materials used in these masks e.g. for substrate are such that induced photoconductivity and photoemissivity are extremely low and are incapable of providing sufficient eletron discharge. The electrons are discharged by using a thin, low work function (e.g. between 1 and 3eV) coating 20 which is applied over the entire mask surface, the coating 20 being transparent to the radiation which will later be incident upon the mask when it is used in a fabrication process. Due to induced photoemission in the thin coating layer, enough photoemitted electrons will be produced to balance the buildup of electrons from the electron beam, thereby discharging the surface of the mask. The electron beam is a high energy beam, having energies greater than about 5000 eV, and a resolution less than about 1 micrometer. Cesium telluride (CsTe) is a suitable coating material.
摘要:
Uniform illumination of a two dimensional area, such as a lithographic mask, is provided. The fan-like input beam : (50) is sent to a mirror (52), which it strikes at a grazing angle and is then reflected to the area to be illuminated. Collimation occurs to reduce the divergence of the beam in order to increase its intensity. By changing the grazing angle between the reflected beam (50) and the mirror (52) by a small amount, the reflected beam (54) will be swept across the two dimensional area. The angle is changed at a non-uniform rate which is a function of time, and is chosen so that substantially uniform illumination occurs at all points in the area to be illuminated. A particular embodiment uses a divergent x-ray beam from a synchrotron source. The divergent beam strikes a cylindrical mirror, which collimates it and directs the reflected beam to an x-ray mask plane. The mirror is moved with a nonlinear velocity in order to provide substantially uniform illumination of the mask area, and substantially uniform heating across the mask plane.
摘要:
Sealing and stress relief are provided to a low-fracture strength glass-ceramic substrate. Hermeticity is addressed through the use of capture pads in alignment with vias and through polymeric overlayers with interconnection between the underlying via or pad metallurgy and the device, chip, wire or pin bonded to the surface of the layer. Multilevel structures are taught along with a self-aligned sealing and wiring process.
摘要:
Sealing and stress relief are provided to a low-fracture strength glass-ceramic substrate. Hermeticity is addressed through the use of capture pads in alignment with vias and through polymeric overlayers with interconnection between the underlying via or pad metallurgy and the device, chip, wire or pin bonded to the surface of the layer. Multilevel structures are taught along with a self-aligned sealing and wiring process.
摘要:
A process for radiation induced dry etching a metallised (e.g. copper) substrate is disclosed wherein the substrate is exposed to a patterned beam of laser radiation in a halogen gas atmosphere which is reactive with the substrate to form a metal halide salt reaction product to accelerate the formation of the metal halide salt without its substantial removal from the substrate. The metal halide salt is removed from the substrate by contact of the substrate with a solvent for the metal halide salt.