Abstract:
A substrate support (1), includes: a substrate support location (4) configured to support a substrate (W), and a vacuum clamping device (7) configured to clamp the substrate on the substrate support location, wherein the vacuum clamping device includes at least one reduced pressure source (8) to create a reduced pressure, at least one vacuum section (9) connected to the at least one reduced pressure source, wherein the at least one vacuum section is configured to attract the substrate towards the substrate support location, and a control device (16) configured to control a spatial pressure profile along the at least one vacuum section with which the substrate is attracted by the vacuum clamping device, wherein the control device includes a substrate shape data input (16a) to receive substrate shape data representing shape data of the substrate to be clamped, and wherein the control device is configured to adapt the spatial pressure profile in dependency of the substrate shape data.
Abstract:
A substrate table (WT) supports a substrate holder (WH) to which a substrate (W) is clamped for exposure. The substrate table (WT) has a plurality of e-pins (30) spaced apart from and distributed around the center of the substrate holder for receiving and lowering a substrate onto the substrate holder prior to exposure and raising a substrate off the substrate holder after exposure. Tip portions of the e-pins (30) and the corresponding apertures (24) in the substrate holder (WH) have a shape in plan including at least one re-entrant, e.g. a cross shape.
Abstract:
A support apparatus (60) for a lithographic apparatus has an object holder (61) and an extraction body (65) radially outward of the object holder. The object holder is configured to support an object (W). The extraction body includes an extraction opening (66) configured to extract fluid from a top surface of the support apparatus. The extraction body is spaced from the object holder such that the extraction body is substantially decoupled from the object holder. The extraction body comprises a projection (30) configured such that it surrounds the object holder and such that, in use, a layer of liquid (32) is retained on the projection and in contact with an object supported on the object holder.
Abstract:
An extraction body (67) is for a support apparatus (WT) of a lithographic apparatus. The support apparatus is configured to support an object (W). The extraction body is formed with an opening (91) at a surface (69) thereof. The opening extends within the extraction body forming a first passageway (90). The first passageway is configured to fluidly communicate an extraction channel (92) in the extraction body to liquid between the surface and the object. A first pressure in the extraction channel is less than ambient pressure. At least a part of the first passageway is sized and dimensioned such that when the liquid enters the first passageway via the opening, a second pressure in the first passageway associated with surface tension of the liquid is lower than the first pressure such that at least a portion of the liquid is retained in the first passageway.
Abstract:
A substrate holder for use in a lithographic apparatus and configured to support a substrate, the substrate holder comprising: a main body having a main body surface; and a plurality of burls projecting from the main body surface; wherein each burl has a distal end configured to engage with the substrate; the distal ends of the burls substantially conform to a support plane whereby a substrate can be supported in a substantially flat state on the burls; a frictional force between the distal end of each burl and a substrate engaged therewith arises in a direction parallel to the support plane in the event of a relative movement of the substrate and substrate holder in the direction; and distal end surfaces of the burls are provided with a release structure configured so that the frictional force is less than would arise in the absence of the release structure.
Abstract:
The invention relates to a lithographic apparatus comprising: - an object (OB) that is moveable in at least one direction (X, Y); - a control system to move the object in the at least one direction, wherein the control system is arranged to control movement of the object in the at least one direction in a frequency range of interest; - a conduit (CC) provided with a fluid (CF); wherein the conduit is arranged on or in the object in a pattern, wherein the pattern is such that an acceleration of the object in the at least one direction causes an acceleration pressure profile in the fluid along the conduit, wherein the acceleration pressure profile does not match with a resonance pressure profile that corresponds to a standing wave mode in the fluid with a resonance frequency in the frequency range of interest.
Abstract:
A support table (WT) to support a surface of a substrate (W), wherein the support table comprises: a base surface (22) substantially parallel to the surface of the substrate, a plurality of burls (20) protruding above the base surface, each of the burls having a respective distal end and a first height above the base surface, the burls arranged such that, when the substrate is supported by the support table, the substrate is supported by the respective distal ends, and a plurality of elongate raised protrusions (45) separated by gaps, each of the elongate raised protrusions having a second height above the base surface, wherein the elongate raised protrusions protrude above the base surface between the burls, and the second height is less than the first height; wherein the protrusions (45) are arranged such that a plurality of the gaps are aligned to form a straight gas flow path (82) towards an edge of the base surface.
Abstract:
An object table (WT) to support an object (W), the object table having a support body (100), an object holder (30) to hold an object, an opening (5) adjacent an edge of the object holder, and a channel (16) in fluid communication with the opening via a passageway (14), wherein the channel is defined by a first material which is different to a second material defining the passageway.
Abstract:
A support table to support a surface of a substrate, wherein the support table includes: a base surface substantially parallel to the surface of the substrate, a plurality of burls protruding above the base surface, each of the burls having a respective distal end and a first height above the base surface, the burls arranged such that, when the substrate is supported by the support table, the substrate is supported by the respective distal ends, and a plurality of elongate raised protrusions separated by gaps, each of the elongate raised protrusions having a second height above the base surface, wherein the elongate raised protrusions protrude above the base surface between the burls, and the second height is less than the first height; wherein the protrusions are arranged such that a plurality of the gaps are aligned to form a straight gas flow path towards an edge of the base surface.
Abstract:
A substrate holder for use in a lithographic apparatus and configured to support a substrate, the substrate holder including: a main body having a main body surface; and a plurality of burls projecting from the main body surface; wherein each burl has a distal end configured to engage with the substrate; the distal ends of the burls substantially conform to a support plane whereby a substrate can be supported in a substantially flat state on the burls; a frictional force between the distal end of each burl and a substrate engaged therewith arises in a direction parallel to the support plane in the event of a relative movement of the substrate and substrate holder in the direction; and distal end surfaces of the burls are provided with a release structure configured so that the frictional force is less than would arise in the absence of the release structure.