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Related Experiment Video

Updated: Jun 12, 2026

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy (iPALM)

Three-dimensional Super Resolution Microscopy of F-actin Filaments by Interferometric PhotoActivated Localization Microscopy (iPALM)

Published on: December 1, 2016

Moire interferometric focusing system for optical microlithography.

D Gregoris, V M Ristic

|June 5, 2010

Summary

This summary is machine-generated.

This study introduces an interferometric apparatus to detect axial and angular misalignments in photolithographic cameras. Moire interference fringes reveal film plane deviations, aiding precise camera focusing.

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Last Updated: Jun 12, 2026

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Area of Science:

Optics and Photonics
Metrology
Semiconductor Manufacturing

Background:

Accurate film plane alignment is critical in photolithography for high-resolution patterning.
Existing methods for detecting misalignments can be complex or lack precision.

Purpose of the Study:

To propose and demonstrate a novel interferometric apparatus for detecting axial and angular misalignments of the film plane in photolithographic cameras.
To provide a simple and effective method for real-time monitoring of camera focus and alignment.

Main Methods:

Utilizing moire interference fringes generated by superposing a reference fringe pattern with a perturbed pattern.
Developing an interferometric setup to capture and analyze fringe distortions caused by film plane misalignments.
Implementing a theoretical model to correlate fringe patterns with specific axial and angular deviations.

Main Results:

Successfully detected both axial and angular misalignments using the proposed interferometric method.
Observed moire fringes directly correlate with the degree and type of film plane deviation.
Experimental results validate the theoretical predictions for misalignment detection.

Conclusions:

The proposed interferometric apparatus offers a sensitive and straightforward method for detecting film plane misalignments in photolithographic cameras.
This technique can enhance process control and yield in semiconductor manufacturing by ensuring accurate camera focusing.
The simplicity of the experimental implementation suggests practical applicability in industrial settings.