摘要:
A method for performing a tilted focus test includes the steps of providing a target object, providing a projection beam of radiation using a radiation source, providing a reflective device to introduce a projected projection beam of radiation onto the target portion, introducing a first projected projection beam of radiation onto the target object using the reflective device in a first orientation, using a tilting device for tilting the reflective device to a second orientation to provide a second projection beam with a tilt relative to said first projection beam, introducing a second projected projection beam of radiation onto the target object, and determining a lateral shift of the first and second projected projection beams on the target object and determining from said lateral shift a defocus of the target object with respect to the projected projection beam.
摘要:
The present invention relates to an exposure apparatus that includes an illumination system for providing a projection beam of radiation, a support structure for supporting a device provided with a pattern, the device serving to impart the projection beam with a pattern in its cross-section; a table for holding a target object, a projection system for projecting the patterned beam onto the target object and a tilting device for providing the projection beam with a tilt. The tilting device is provided substantially in a pupil plane of the projection system.
摘要:
A method for performing a tilted focus test includes the steps of providing a target object, providing a projection beam of radiation using a radiation source, providing a reflective device to introduce a projected projection beam of radiation onto the target portion, introducing a first projected projection beam of radiation onto the target object using the reflective device in a first orientation, using a tilting device for tilting the reflective device to a second orientation to provide a second projection beam with a tilt relative to said first projection beam, introducing a second projected projection beam of radiation onto the target object, and determining a lateral shift of the first and second projected projection beams on the target object and determining from said lateral shift a defocus of the target object with respect to the projected projection beam.
摘要:
System aberrations are effected in a projection system of a lithographic apparatus to optimize imaging of a thick reflective mask with a thick absorber that is obliquely illuminated. The aberrations may include Z5 astigmatism, Z9 spherical, and Z12 astigmatism.
摘要:
The present invention relates to an exposure apparatus that includes an illumination system for providing a projection beam of radiation, a support structure for supporting a device provided with a pattern, the device serving to impart the projection beam with a pattern in its cross-section; a table for holding a target object, a projection system for projecting the patterned beam onto the target object and a tilting device for providing the projection beam with a tilt. The tilting device is provided substantially in a pupil plane of the projection system.
摘要:
A calibration apparatus is provided for calibrating a radiation sensor in a lithographic apparatus. The calibration apparatus includes a window formed of substantially radiation-transparent material for allowing radiation to pass therethrough to reach the radiation sensor. A first reference sensor is located behind the window, having an active surface abutting the window, for measuring the intensity of radiation which passes through the window. A second reference sensor is located a short distance behind the window, having an active surface facing the window, for measuring the intensity of radiation which passes through the window, a first contamination layer formed on the window, and a second contamination layer formed on the active surface of the second reference sensor. The radiation sensor can be calibrated by combining the measurements from the first and second radiation sensors.
摘要:
An actuator system is provided that is configured to move a component relative to a base of the actuator system. The actuator system may include first and second actuating elements, each including two sections of material that are joined to each other and have different coefficients of thermal expansion. The two actuating elements may be configured such that if the temperature of one is increased it applies a force on the component in a direction that is opposite to the force applied by the other actuating element if its temperature is increased. The actuator system may further include at least one power supply configured to provide independently controllable heating to the first and second actuating elements.
摘要:
An illumination system includes a field-facet mirror-device and a pupil mirror configured to condition a beam of radiation incident on the field-facet mirror-device. The field-facet mirror-device includes reflective field facets movable between first and second orientations relative to the incident beam. The field facets in their first orientations are effective to reflect the incident radiation towards respective reflective pupil facets so as to form part of a conditioned beam reflected from the pupil-facet mirror-device. The field facets in their second orientations are effective to reflect the incident radiation onto respective areas of the pupil-facet mirror-device designated as beam dump areas. The areas are arranged to prevent radiation incident on the areas from forming part of the conditioned beam and are arranged between the limits of an annular area on the pupil-facet mirror-device effective to define the inner and outer regions of the conditioned beam reflected from the pupil-facet mirror-device.
摘要:
A lithographic projection apparatus is disclosed for use with an immersion liquid positioned between the projection system and a substrate. Several methods and mechanism are disclosed to protect components of the projection system, substrate table and a liquid confinement system. These include providing a protective coating on a final element of the projection system as well as providing one or more sacrificial bodies upstream of the components. A two component final optical element of CaF2 is also disclosed.
摘要:
An actuator system is provided that is configured to move a component relative to a base of the actuator system. The actuator system may include first and second actuating elements, each including two sections of material that are joined to each other and have different coefficients of thermal expansion. The two actuating elements may be configured such that if the temperature of one is increased it applies a force on the component in a direction that is opposite to the force applied by the other actuating element if its temperature is increased. The actuator system may further include at least one power supply configured to provide independently controllable heating to the first and second actuating elements.