Imprint System Substrate Mark Optical Contrast Alignment

The patent introduces a substrate-side mark made of a material that serves as an intermediary between the substrate and the detection system. This mark material has optical properties that differ from both the substrate and the imprint material, allowing it to act as a mediator that enables detection. The mark provides a detectable optical signal that bridges the gap between the substrate and the detection apparatus, solving the problem of detecting marks on substrates with optical properties similar to the imprint material.

The patent applies local quality by making only the substrate-side mark region different in optical properties from the surrounding substrate area. The mark is formed with a specific material or structure that creates local optical contrast, while the rest of the substrate maintains its original properties. This localized differentiation allows detection without requiring the entire substrate to have different optical characteristics from the imprint material.

The patent applies preliminary action by forming the substrate-side mark before the imprinting process. The mark is created in advance on the substrate, allowing it to be used for alignment and detection during subsequent processing steps. This preliminary formation enables the mark to be established with materials and methods optimized for detection, without adding complexity to the main imprinting process.

The patent uses copying by creating a simplified representation of the alignment features on the substrate-side mark. Rather than requiring complex or expensive materials, the mark copies the essential function of alignment and detection using simpler, more cost-effective materials that still provide the necessary optical contrast for measurement.