Abstract:
A method and apparatus for actively monitoring conditions of a plasma source for adjustment and control of the source and to detect the presence of unwanted contaminant species in a plasma reaction chamber (220). Preferred embodiments include a spectrometer (252) used to quantify components of the plasma. A system controller is provided that uses feedback loops based on spectral analysis of the plasma to regulate the ion composition of the plasma source. The system also provides end pointing means based on spectral analysis to determine when cleaning of the plasma source is completed.
Abstract:
Methods of dispensing a small amount of liquid onto a work piece includes in some embodiments known providing a microscopic channel for the liquid to flow from the nanodispenser. In some embodiments, dispensing the liquid includes dispensing the liquid using a nanodispenser have at least one slit extending to the tip. Some methods include controlling the rate of evaporation or the rate of liquid flow to establish an equilibrium producing a bubble of a desired size.
Abstract:
An inductively coupled plasma charged particle source (100, 200, 300, 400, 500, 600) for focused ion beam systems includes a plasma reaction chamber (102, 202, 302, 402, 502, 602) with a removably attached source electrode (106, 206, 306, 406, 506, 606). A fastening mechanism (104, 204, 304, 404, 504) connects the source electrode with the plasma reaction chamber and allows for a heat-conductive, vacuum seal to form. With a removable source electrode, improved serviceability and reuse of the plasma source tube are now possible.
Abstract:
Methods of dispensing a small amount of liquid onto a work piece includes in some embodiments known providing a microscopic channel for the liquid to flow from the nanodispenser. In some embodiments, dispensing the liquid includes dispensing the liquid using a nanodispenser have at least one slit extending to the tip. Some methods include controlling the rate of evaporation or the rate of liquid flow to establish an equilibrium producing a bubble of a desired size.
Abstract:
A method and system for creating a substantially planar face in a substrate, the method including directing one or more beams at a first surface of a substrate to remove material from a first location in the substrate, the beam being offset from a normal to the first surface by a nonzero curtaining angle; sweeping the one or more beams in a plane that is perpendicular to the first surface to mill one or more initial cuts in the substrate, the initial cuts exposing a second surface that is substantially perpendicular to the first surface; rotating the substrate through a nonzero rotation angle about an axis other than an axis that is normal to the first beam or parallel to the first beam; directing the first beam at the second surface to remove additional material from the substrate without changing the first nonzero curtaining angle; and scanning the one or more beams in a pattern across the second surface to mill one or more finishing cuts in the substrate.
Abstract:
A split grid multi-channel secondary particle detector for a charged particle beam system includes a first grid segment and a second grid segment, each having independent bias voltages creating an electric field such that the on-axis secondary particles that are emitted from the target are directed to one of the grids. The bias voltages of the grids can be changed or reversed so that each grid can be used to detect the secondary particles and the multi-channel particle detector as a whole can extend its lifetime.
Abstract:
A mass filter for an ion beam system includes at least two stages (306U,306L) and reduces chromatic aberration. One embodiment includes two symmetrical mass filter stages, the combination of which reduces or eliminates chromatic aberration, and entrance and exit fringing field errors. Embodiments can also prevent neutral particles from reaching the sample surface and avoid crossovers in the beam path. In one embodiment, the filter can pass a single species of ion from a source that produces multiple species. In other embodiments, the filter can pass a single ion species with a range of energies and focus the multi-energetic ions at the same point on the substrate surface.
Abstract:
A method and system for the imaging and localization of fluorescent markers such as fluorescent proteins or quantum dots within biological samples is disclosed. The use of recombinant genetics technology to insert "reporter" genes into many species is well established. In particular, green fluorescent proteins (GFPs) and their genetically-modified variants ranging from blue to yellow, are easily spliced into many genomes at the sites of genes of interest (Gols), where the GFPs are expressed with no apparent effect on the functioning of the proteins of interest (Pols) coded for by the Gols. One goal of biologists is more precise localization of Pols within cells. The invention is a method and system for enabling more rapid and precise Pol localization using charged particle beam-induced damage to GFPs. Multiple embodiments of systems for implementing the method are presented, along with an image processing method relatively immune to high statistical noise levels. Fig. 3
Abstract:
The present invention provides improved angular aperture schemes for generating shaped beam spots having a desired geometric shape from rectangular, elliptical, and semi-elliptical apertures having one sharp edge. A sharper beam edge can be generated by offsetting the rectangular or elliptical aperture in combination with under or over focus. In the spherical aberration limit, under-focused semi-circle apertures provide a sharp, flat edge. The sharp edge can be made resolute enough for precision milling applications, and at the same time, the spot can be made large enough with enough overall current and current density to efficiently mill away material in either a production or laboratory environment. Depending on the particular beam spot that is desired, combinations of techniques including defocusing, aperture offsetting, and stigmation adjustment, can be used in both spherical aberration dominant and chromatic aberration dominant environments to achieve a desired beam for a desired application.