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Related Experiment Video

Updated: Oct 20, 2025

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

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

Published on: July 5, 2016

A Compact Raster Lensless Microscope Based on a Microdisplay.

Anna Vilà^1,2, Sergio Moreno¹, Joan Canals¹

¹Department of Electronic and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.

Sensors (Basel, Switzerland)

|September 10, 2021

Summary

This summary is machine-generated.

This study demonstrates the smallest practical lensless microscope, achieving 800 nm resolution in a millimeter-high device. This raster optical microscopy approach simplifies imaging without complex light reconstruction.

Keywords:

microdisplay illumination minute microscope raster image scan optical microscopy

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Last Updated: Oct 20, 2025

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Published on: September 8, 2017

Area of Science:

Optics
Microscopy
Imaging Technology

Background:

Lensless microscopy offers a simplified optical configuration using only a light source, sample, and image sensor.
Traditional lensless methods often require complex light backpropagation for image reconstruction.

Purpose of the Study:

To demonstrate the smallest practical lensless microscope.
To achieve high resolution in a compact device without traditional lenses.

Main Methods:

Utilized raster optical microscopy with a single-pixel detector and a microdisplay.
Positioned the object near the lighting source, differing from standard lensless microscopy setups.
Optimized resolution by controlling LED size and sample-to-microdisplay proximity.

Main Results:

Achieved resolutions down to 800 nm within a millimeter-high microscope.
Demonstrated successful imaging with large detectors (138 μm × 138 μm).
Field of view was determined by the microdisplay size, simplifying the optical path.

Conclusions:

The developed microscope represents a significant miniaturization in lensless imaging.
The raster optical microscopy technique provides high resolution without requiring light backpropagation.
Further technological advancements could reduce measurement times for this compact microscopy system.