Laser Substrate Heating for Uniform Pattern Line Widths

The patent introduces a pre-etching process that selectively etches the anchor pattern before the main etching step. This preliminary action creates a size difference between the anchor pattern and monitoring pattern, allowing the main etching to stop at the desired line width without over-etching the monitoring pattern. The pre-etched anchor pattern serves as a sacrificial reference that absorbs the excess etching that would otherwise damage the critical monitoring patterns.

The patent applies different etching conditions to different patterns on the substrate. The anchor pattern undergoes pre-etching with specific parameters, while the monitoring pattern is protected from this preliminary etching. This localized differentiation allows each pattern to receive the appropriate etching treatment, ensuring uniform final line widths without compromising the monitoring pattern integrity.

The patent performs the line width correction through a pre-etching step rather than requiring additional post-etching processes. By correcting the anchor pattern line width before the main etching sequence, the patent eliminates the need for repeated etching cycles and subsequent inspections, thereby reducing total process time while maintaining high precision.

The patent integrates the line width correction into the continuous etching process flow rather than treating it as a separate corrective step. The pre-etching of the anchor pattern is seamlessly followed by the main etching process, maintaining continuous useful action and avoiding interruptions or additional process cycles that would increase overall processing time.

The patent extracts the quality assessment function from multiple pattern inspections to a single anchor pattern inspection. By concentrating all critical quality information into the anchor pattern, the patent allows inspectors to evaluate the entire batch quality by examining only the anchor pattern, thereby maintaining high inspection precision while dramatically reducing inspection time.

The anchor pattern serves as a representative copy or proxy for the entire pattern set. The anchor pattern is designed to replicate the critical characteristics and potential defects that would appear in other patterns, allowing a single inspection to infer the quality status of multiple patterns without requiring individual inspection of each one.