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Superresolution confocal technology for displacement measurements based on total internal reflection.

Cuifang Kuang¹, M Yakut Ali, Xiang Hao

¹State Key Laboratory of Modern Optical Instrumentations, Zhejiang University, Hangzhou 310027, China. cfkuang@zju.edu.cn

The Review of Scientific Instruments

|November 2, 2010

Summary

A new method using total internal reflection filters and confocal microscopy achieves sub-nanometer axial resolution for displacement measurements. This technique significantly enhances measurement accuracy and stability compared to traditional methods.

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Area of Science:

Optics
Metrology
Microscopy

Background:

Accurate displacement measurement is crucial in various scientific and industrial fields.
Existing methods often face limitations in achieving high axial resolution.
Enhancing the resolution of nonlinearity in reflectance curves is key for precise measurements.

Purpose of the Study:

To propose and validate a novel method for high-resolution axial displacement measurement.
To theoretically analyze the principles of the proposed measurement technique.
To experimentally verify the feasibility, accuracy, and stability of the developed system.

Main Methods:

Development of a novel measurement method combining total internal reflection filters and confocal microscopy principles.
Theoretical analysis of the fundamental measurement principles and the confocal detection scheme.
Construction of a prototype system and performance evaluation through laboratory experiments.

Main Results:

The proposed confocal detection scheme effectively enhances the resolution of the reflectance curve's nonlinearity.
Experimental results demonstrate an axial resolution better than 1 nm within a 200 nm range.
The developed system shows superior performance, achieving threefold improvement over plane reflector methods.

Conclusions:

The novel method based on total internal reflection filters and confocal microscopy offers superior axial resolution for displacement measurements.
The developed prototype system is feasible, accurate, and stable for high-precision metrology.
This technique represents a significant advancement in achieving sub-nanometer displacement resolution.