Measurement apparatus and method
First Claim
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1. A measurement apparatus comprising:
- a radiation output configured to provide a measurement beam of radiation such that an individually controllable element of an array of individually controllable elements capable of modulating a beam of radiation, is illuminated by the measurement beam and redirects the measurement beam; and
a detector arranged to receive the redirected measurement beam and determine tilt of the individually controllable element from the redirected measurement beam.
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Abstract
A measurement apparatus disclosed that has a radiation source configured to provide a measurement beam of radiation such that an individually controllable element of an array of individually controllable elements capable of modulating a beam of radiation, is illuminated by the measurement beam and redirects the measurement beam, and a detector arranged to receive the redirected measurement beam and determine the position at which the redirected measurement beam is incident upon the detector, the position at which the redirected measurement beam is incident upon the detector being indicative of a characteristic of the individually controllable element.
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Citations
20 Claims
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1. A measurement apparatus comprising:
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a radiation output configured to provide a measurement beam of radiation such that an individually controllable element of an array of individually controllable elements capable of modulating a beam of radiation, is illuminated by the measurement beam and redirects the measurement beam; and a detector arranged to receive the redirected measurement beam and determine tilt of the individually controllable element from the redirected measurement beam. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lithographic apparatus, comprising:
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an array of individually controllable elements capable of modulating a beam of radiation; a measurement apparatus comprising; a radiation output configured to provide a measurement beam of radiation to an individually controllable element of the array of individually controllable elements, and a detector arranged to receive the measurement beam as redirected by the individually controllable element and to determine tilt of the individually controllable element from the redirected measurement beam; and a projection system arranged to project the modulated beam of radiation onto a radiation-sensitive target portion of a substrate. - View Dependent Claims (9, 10, 11)
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12. A method comprising:
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illuminating, with a measurement beam of radiation, an individually controllable element of an array of individually controllable elements, the array being capable of modulating a beam of radiation, the illuminating being such that the individually controllable element redirects the measurement beam of radiation; receiving the redirected measurement beam at a detector; and determining tilt of the individually controllable element from the redirected measurement beam. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification