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Enhanced optical microlithography with a Fabry-Perot-based spatial filtering technique.
1Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77251, USA.
Applied Optics
|March 14, 2008
Summary
A new optical microlithography technique uses a Fabry-Perot etalon to improve resolution and depth of focus for integrated circuit fabrication. This method enhances imaging for critical contact hole arrays and line-space patterns.
Area of Science:
- Optical engineering
- Nanofabrication
- Semiconductor manufacturing
Background:
- Optical microlithography is crucial for integrated circuit fabrication.
- Achieving higher resolution and depth of focus simultaneously is a persistent challenge.
- Existing techniques often face trade-offs between resolution and depth of focus.
Purpose of the Study:
- To investigate a coherent multiple imaging technique for optical microlithography.
- To evaluate the use of a Fabry-Perot etalon for enhancing lithographic imaging.
- To assess the impact of this technique on critical mask structures.
Main Methods:
- Utilized the Prolith/2 optical lithography simulation tool.
- Evaluated aerial image profiles for extended mask structures (contact holes, line-space patterns).
- Performed experimental studies to validate simulation findings.
Main Results:
- The Fabry-Perot etalon technique was integrated into an optical stepper setup.
- Simulations and experiments demonstrated enhanced aerial image profiles.
- Simultaneous improvements in resolution and depth of focus were achieved.
Conclusions:
- The studied Fabry-Perot etalon technique offers a viable method for improving optical microlithography.
- Appropriate etalon parameter selection is key to optimizing resolution and depth of focus.
- This technique shows promise for advanced integrated circuit fabrication.
