Patent ID: 8013977

Claim:
A lithographic apparatus, comprising: a support configured to support a patterning device, the patterning device being configured to provide a radiation beam at a first wavelength with a pattern in the cross-section of the radiation beam to form a patterned radiation beam at the first wavelength; a substrate table configured to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate, the projection system comprising a final element; and a substrate-level sensor comprising a radiation receiver positioned in, or positionable into, a focal plane of the final element; a transmissive plate configured to support the radiation receiver at a side facing the projection system; a quantum conversion layer configured to absorb radiation at a first wavelength incident on the transmissive plate and reradiate radiation at a second wavelength, the quantum conversion layer arranged on a side of the transmissive plate opposite the side facing the projection system; a fiber optics block comprising a plurality of optical fibers; and a radiation detector, wherein the plurality of optical fibers is configured to guide radiation reradiated by the quantum conversion layer towards the radiation detector, wherein the fiber optics block is connected to the quantum conversion layer and separable from the radiation detector so as to be spaced away from the radiation detector.