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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
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3D push-pull heterodyne interferometer for SPM metrology.
Applied Optics
|June 4, 2019
Summary
A new laser interferometer achieves subnanometer resolution for probe microscope scanners, ensuring measurement traceability. This advanced system minimizes errors for highly accurate dimensional metrology.
Area of Science:
- Metrology
- Optical Engineering
- Nanotechnology
Background:
- Accurate displacement measurement is crucial for scanning probe microscopy (SPM).
- Existing methods may lack sufficient resolution or traceability to the standard of meter.
- Subnanometer resolution is required for advanced metrological applications.
Purpose of the Study:
- To develop and characterize a three-coordinate heterodyne laser interferometer for SPM scanner displacement measurement.
- To achieve subnanometer resolution and traceability to the standard of meter.
- To investigate and minimize sources of error for high measurement accuracy.
Main Methods:
- Development of a three-coordinate heterodyne laser interferometer system.
- Utilizing a stabilized He-Ne laser for traceability to the standard of meter.
- Error analysis and minimization techniques applied to the interferometer system.
- Metrological characterization using a scanning probe microscope (SPM) NanoScan-3D and TGZ-type calibration gratings.
Main Results:
- The developed laser interferometer achieves a resolution of 0.01 nm and a measurement uncertainty not exceeding 0.2 nm.
- Measurements performed with the SPM and interferometer system showed agreement with established standards (PTB, Germany).
- The system demonstrated traceability to the standard of meter via the He-Ne laser wavelength.
Conclusions:
- The three-coordinate heterodyne laser interferometer offers a highly accurate and traceable solution for subnanometer displacement measurements in SPM.
- The system's performance meets rigorous metrological requirements for advanced dimensional analysis.
- This technology enables precise measurement of dynamic etalons and other critical geometric dimensions.
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