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Updated: Jul 31, 2025

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

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Published on: July 5, 2016

GRIN-lens-based in-line digital holographic microscopy.

Ali Akbar Khorshad, Nicholas Devaney

|May 3, 2023

Summary

This summary is machine-generated.

Gradient-index (GRIN) rod lens in-line digital holographic microscopy (DHM) offers improved resolution for imaging micro-particles. This compact and cost-effective setup achieves micrometer-scale resolution, outperforming conventional systems.

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Area of Science:

Optics and Photonics
Microscopy Techniques
Holography

Background:

In-line digital holographic microscopy (DHM) offers 3D imaging with large fields of view and depth of field.
Traditional DHM systems often rely on pinholes, which can limit resolution and complicate alignment.
Gradient-index (GRIN) rod lenses present an alternative for compact and potentially higher-resolution DHM setups.

Purpose of the Study:

To develop and experimentally demonstrate an in-line DHM system utilizing a GRIN rod lens.
To compare the resolution and image quality of the GRIN-based DHM with a conventional pinhole-based DHM.
To investigate the theoretical and experimental factors influencing resolution in DHM systems.

Main Methods:

Development of theoretical framework for GRIN rod lens in-line DHM.
Experimental implementation of both GRIN-based and pinhole-based in-line DHM configurations.
Holographic imaging of polystyrene micro-particles (2.0 and 3.0 µm) using the optimized GRIN setup.
Systematic investigation of the effect of source-detector and sample-detector distances on resolution.

Main Results:

The optimized GRIN-based DHM achieved a resolution of approximately 1.38 µm in a high-magnification regime.
The GRIN-based setup demonstrated superior resolution compared to the pinhole-based system under specific conditions.
Experimental results for resolution and imaging of micro-particles showed good agreement with theoretical predictions.
The study successfully imaged dilute polystyrene micro-particles with high fidelity.

Conclusions:

GRIN rod lens in-line DHM is a viable and effective technique for high-resolution 3D imaging.
The GRIN-based approach offers advantages in resolution and potentially compactness over pinhole-based DHM.
Understanding the impact of optical distances is crucial for optimizing DHM resolution.
This technology holds promise for applications requiring detailed micro-particle analysis.