Abstract:
In a lithographic projection system, the radiation energy delivered to the substrate needs to be accurately controlled. Attenuation by injecting an absorbent gas into a volume through which the radiation passes is a convenient way to control the energy. Additionally, the interaction between gasses and the radiation may be used to measure the energy of the radiation with minimal disruption to the radiation.
Abstract:
A lithographic projection apparatus is disclosed. The apparatus includes a radiation system to transmit a beam of radiation emitted from a radiation source, and a support structure constructed to hold a patterning structure to be irradiated by the beam. A substrate holder is constructed to hold a substrate, and a projection system is constructed and arranged to project an irradiated portion of the patterning structure onto a target portion of the substrate. A first screen is positioned in a path of the beam between the radiation system and an optical element and a positive voltage is applied to the first screen to repel positively charged particles away from the optical element. A second screen is positioned in the path of the beam on at least one side of the first screen, and a negative voltage is applied to the second screen to repel negative particles away from the first screen.
Abstract:
A lithographic projection apparatus is disclosed. The apparatus includes a radiation system that includes a radiation source and an illumination system that supplies a beam of radiation, and a support structure that supports a patterning structure. The patterning structure is configured to pattern the beam of radiation according to a desired pattern. The apparatus also includes a substrate support that supports a substrate, a projection system that projects the patterned beam onto a target portion of the substrate, an electrode, and a voltage source that applies an electric field between the radiation source and the electrode to generate a discharge between the radiation source and the electrode.
Abstract:
A cleaning system for removing contamination from at least a part of a surface of a component in a lithographic projection apparatus is disclosed. The cleaning system includes an electric field generator that generates an electric field to provide cleaning particles near the surface of the component.
Abstract:
A lithographic projection apparatus is disclosed. The apparatus includes a support structure constructed to support a patterning structure. The patterning structure is adapted to pattern a beam of radiation according to a desired pattern. The apparatus also includes a substrate holder that is constructed to hold a substrate, a projection system that is constructed and arranged to project the patterned beam onto a target portion of the substrate, and a downstream radical source that is connected to a gas supply and is configured to provide a beam of radicals onto a surface to be cleaned.
Abstract:
A lithographic projection apparatus for EUV lithography includes a foil trap. The foil trap forms an open structure after the EUV source to let the EUV radiation pass unhindered. The foil trap is configured to be rotatable around an optical axis. By rotating the foil trap, an impulse transverse to the direction of propagation of the EUV radiation can be transferred on debris present in the EUV beam. This debris will not pass the foil trap. In this way, the amount of debris on the optical components downstream of the foil trap is reduced.
Abstract:
A controlled aperture provides an opening through a barrier separating two parts of the apparatus to enable a pulse of radiation to be radiated from one part of the apparatus to the a second part. The controlled aperture closes the opening between the pulses of radiation to minimize the gas flow between the first and second parts.
Abstract:
A contamination barrier that passes through radiation from a radiation source and captures debris coming from the radiation source is disclosed. The contamination barrier includes an inner ring, an outer ring, and a plurality of lamellas. The lamellas extend in a radial direction from a main axis, and each of the lamellas is positioned in a respective plane that include the main axis. At least one outer end of each of the lamellas is slidably connected to at least one of the inner and outer ring.
Abstract:
A lithographic projection apparatus includes a radiation system configured to form a projection beam of radiation from radiation emitted by a radiation source, as well as a support configured to hold a patterning device, which when irradiated by the projection beam provides the projection beam with a pattern. A substrate table is configured to hold a substrate, and a projection system is configured to image an irradiated portion of the patterning device onto a target portion of the substrate. The radiation system further includes an aperture at a distance from the optical axis, a reflector which is placed behind the aperture when seen from the source and a structure placed in a low radiation intensive region behind the aperture.
Abstract:
In a lithographic projection apparatus, a grating spectral filter is used to filter an EUV projection beam. The grating spectral filter is preferably a blazed, grazing incidence, reflective grating. Cooling channels may be provided in or on the rear of the grating spectral filter. The grating spectral filter may be formed of a material effectively invisible to the desired radiation.