Environmental system including a transport region for an immersion lithography apparatus

摘要

An environmental system controls an environment in a gap between an optical assembly and a device and includes a fluid barrier, an immersion fluid system, and a transport region. The fluid barrier is positioned near the device and maintains the transport region near the gap. The immersion fluid system delivers an immersion fluid that fills the gap. The transport region transports at least a portion of the immersion fluid that is near the fluid barrier and the device away from the device. The immersion fluid system can include a fluid removal system that is in fluid communication with the transport region. The transport region can be made of a porous material.