
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:**Title: Understanding the Role of Sherifs in E-Beam Lithography**
**Introduction:**
Sherifs are proximity correction structures used at the corners of lines in e-beam lithography. Their primary function is to enhance the final shape of the patterned area, making it more rectangular compared to a simple rectangular initial shape. This adjustment is crucial for achieving precise and desired outcomes in microfabrication processes.
**Explanation of Concepts:**
- **Sherifs**: These are small structures added to mask designs to correct distortions that occur during the patterning process.
- **Proximity Correction**: A technique intended to compensate for the undesired spreading of the electron beam during writing, which can cause features to deviate from their intended shapes.
**Impact on E-Beam Writing Time:**
When integrating sherifs, if the size is half the feature size, there must be a calculation on how this change affects the e-beam writing time. Typically, these adjustments may lead to increased exposure times due to the added complexity in the pattern structure.
**Diagrams and Their Significance:**
1. **Mask without Sherif:**
- **Illustration**: A simple square moves into a circular pattern.
- **Interpretation**: This transformation shows what typically happens when no proximity correction is applied; the intended shape becomes distorted (rounding of corners).
2. **Mask with Sherif:**
- **Illustration**: A square with extended corners (sherifs) moves into a more precise rectangular pattern.
- **Interpretation**: Highlighting the effectiveness of sherifs, this transformation demonstrates how the original mask design with sherifs helps maintain the intended rectangular shape after exposure.
**Conclusion:**
Incorporating sherifs in mask design for e-beam lithography is essential for minute precision in pattern making. By understanding and applying these proximity correction structures, engineers can ensure more accurate and reliable microfabrication outcomes.
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