Abstract:
An EUV lithographic apparatus (100) comprises a source collector apparatus (SO) in which the extreme ultraviolet radiation is generated by exciting a fuel to provide a plasma (210) emitting the radiation. The source collector apparatus (SO) includes a chamber (310) in fluid communication with a guide way (320) external to the chamber (310). A pump (BPS) for circulating buffer gas is part of the guide way (320), and provides a closed loop buffer gas flow (222). The gas flowing through the guide way (302) traverses a gas decomposer (TD1) wherein a compound of fuel material and buffer gas material is decomposed, so that decomposed buffer gas material can be fed back into the closed loop flow path (222).
Abstract:
A radiation source (SO) is configured to generate extreme ultraviolet radiation. The radiation source (SO) includes a plasma formation site (2) located at a position in which a fuel will be contacted by a beam of radiation (5) to form a plasma, an outlet (16) configured to allow gas to exit the radiation source (SO), and a contamination trap (23) at least partially- located inside the outlet (16). The contamination trap is configured to trap (23) debris particles that are generated with the formation of the plasma.
Abstract:
A lithographic apparatus for patterning a beam of radiation and projecting it onto a substrate, comprising at least two spectral purity filters configured to reduce the intensity of radiation in the beam of radiation in at least one undesirable range of radiation wavelength, wherein the two spectral purity filters are provided with different radiation filtering structures from each other.
Abstract:
A radiation source generates extreme ultraviolet radiation for a lithographic apparatus as a chamber that is provided with a low pressure hydrogen environment. A trace amount of a protective compound, e.g., H 2 O, H 2 O 2 , O 2 , NH 3 or NO x , is provided to the chamber to assist in maintaining a protective oxide film on metal, e.g., titanium, components in the chamber.
Abstract:
An EUV radiation source includes a fuel supply configured to supply fuel to a plasma formation location. The fuel supply includes a nozzle configured to eject droplets of fuel, and a droplet accelerator configured to accelerate the fuel droplets. The EUV radiation source includes a laser radiation source configured to irradiate the fuel supplied by the fuel supply at the plasma formation location.
Abstract:
Disclosed is a radiation source configured to generate a beam of EUV radiation by excitation of a fuel. The radiation source comprises a gas stream generation module which preconditions a droplet of the fuel by application of a high velocity gas stream to the droplet. Also disclosed is a lithographic apparatus comprising such a radiation source.
Abstract:
A radiation source includes: a nozzle configured to direct a stream of fuel droplets (30) along a trajectory towards a plasma formation location; a laser configured to output laser radiation, the laser radiation directed at the fuel droplets at the plasma formation location to generate, in use, a radiation generating plasma; and a catch configured to catch fuel droplets that pass the plasma formation location, the catch including: a container (40) configured to contain a fluid (42); a driver (44) configured to drive the fluid, to cause the fluid to move; the catch being configured such that the fuel droplets are incident on that moving fluid.
Abstract:
An EUV radiation generation apparatus includes a laser (300) configured to generate pulses (205) of laser radiation, and an optical isolation apparatus that includes a rotatably mounted reflector (305) and a radially positioned reflector (306). The rotatably mounted reflector and the laser are synchronized such that a reflective surface (307,308) of the rotatably mounted reflector is in optical communication with the radially positioned reflector when the optical isolation apparatus receives a pulse of laser radiation to allow the pulse of laser radiation to pass to a plasma formation location (313) and cause a radiation emitting plasma to be generated via vaporization of a droplet (313a) of fuel material. The rotatably mounted reflector and the laser are further synchronized such that the reflective surface of the rotatably mounted reflector is at least partially optically isolated from the radially positioned reflector when the optical isolation apparatus receives radiation (316) reflected from the plasma formation location.
Abstract:
A source collector apparatus for use in a lithographic apparatus comprises a fuel droplet generator (4) configured in use to generate a stream of fuel droplets (6) directed from an outlet of the fuel droplet generator towards a plasma formation location (7). In order to prevent droplet satellites from interfering with plasma formation, a gas supply is provided that in use provides a flow of gas (A) (eg hydrogen) that deflects any droplet satellites out of the fuel droplet stream. Additionally, detection apparatus may be provided as part of a shroud (5) to determine the point at which coalescence of fuel droplets occurs thereby providing an indication of the likelihood of satellite droplets being present in the fuel droplet stream.
Abstract:
A fuel supply for an EUV radiation source is disclosed. The fuel supply comprises a reservoir (40) for retaining a volume of fuel (42), a nozzle (32), in fluid connection with the reservoir, and configured to direct a stream of fuel along a trajectory towards a plasma formation location, and a fuel contamination control arrangement (44) which separates contamination particles from the fuel. The contamination control arrangement comprises at least one acoustic filter. The acoustic filter may apply an acoustic standing wave to the fuel. Also disclosed is a method of controlling contamination in such a fuel supply.