Real-time spatial-phase-locked electron-beam lithography
Name
70716228-MIT.pdf
Description
Full printable version
Size
15.99 MB
Format
Adobe PDF
Checksum (MD5)
8293d8ead80d2e40b9229646a9c5a316
Author(s)
Zhang, Feng, 1973-
Advisor(s)
Henry I. Smith.
Alternative Title
Real-time SPLEBL
Date Issued
2005
Publisher
Massachusetts Institute of Technology
Abstract
The ability of electron-beam lithography (EBL) to create sub-10-nm features with arbitrary geometry makes it a critical tool in many important applications in nanoscale science and technology. The conventional EBL system is limited by its poor absolute-placement accuracy, often worse than its resolution. Spatial-phase-locked electron-Beam lithography (SPLEBL) improves the placement accuracy of EBL tools to the nanometer level by directly referencing the beam position via a global-fiducial grid placed on the substrate, and providing feedback corrections to the beam position. SPLEBL has several different modes of operation, and it can be applied to both scanning electron-beam lithography (SEBL) and variable-shaped-beam lithography. This research focuses primarily on implementing real-time SPLEBL in SEBL systems. Real-time SPLEBL consists of three major components: a fiducial-reference grid, a beam-position detection algorithm and a partial-beam blanker. Several types of fiducial grids and their fabrication processes were developed and evaluated for their signal-to-noise ratio and ease of usage. An algorithm for detecting the beam position based on Fourier techniques was implemented, and -1 nm placement accuracy achieved. Finally, various approaches to partial-beam blanking were examined, and one based on an electrostatic quadrupole lens was shown to provide the best performance.
Description
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (p. 131-139).
Subjects
Electrical Engineering and Computer Science.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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