Highly Sensitive Focus Monitoring Technique Based On Illumination And Target Co-Optimization

By Myungjun Lee, Mark D. Smith, Pradeep Subrahmanyan, and Ady Levy. Abstract We present a cost-effective focus monitoring technique based on the illumination and the target co-optimization. An advanced immersion scanner can provide the freeform illumination that enables the use of any kind of custom source shape by using a programmable array of thousands of individually adjustable micro-mi... » read more