WO/2005/024517 is referenced by 577 patents.

Embodiments of the present invention are directed to a system and a method of controlling the fluid flow and pressure to provide stable conditions for immersion lithography. A fluid is provided in a space (34) between the lens (22) and the substrate (16) during the immersion lithography process. Fluid is supplied to the space and is recovered from the space through a porous member (51) in fluidic communication with the space. Maintaining the pressure in the porous member under the bubble point of the porous member can eliminate noise created by mixing air with the fluid during fluid recovery. In one embodiment, the method comprises drawing the fluid from the space via a recovery flow line through a porous member; and maintaining a pressure of the fluid in the porous member below a bubble point of the porous member during drawing of the fluid from the space.

Title
Apparatus and method for providing fluid for immersion lithography
Application Number
PCT/US2004/022915
Publication Number
2005/024517
Application Date
July 16, 2004
Publication Date
March 17, 2005
Inventor
Kho Leonard Wai Fung
Poon Alex Ka Tim
Agent
COSTANTINO Mario A
Assignee
Kho Leonard Wai Fung
Poon Alex Ka Tim
Nikon Corporation
IPC
G03B 27/52
G02B 21/00
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