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Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

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Chromatically multi-focal optics based on micro-lens array design.

Fang Duan, Wu-Le Zhu, Yanjun Han

|August 6, 2020

Summary

This summary is machine-generated.

This study introduces a micro-lens array (MLA) that corrects chromatic aberrations and separates color channels for Charge-Coupled Device (CCD) imaging. This innovation improves color accuracy by spatially distinguishing red, green, and blue light to individual pixels.

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Area of Science:

Optics
Optical Engineering
Image Sensors

Background:

Charge-Coupled Device (CCD) arrays use a Bayer pattern of red, green, and blue pixels for color imaging.
This pixel arrangement inherently limits the ability to precisely associate a single object point with its color information, even in aberration-free optical systems.
Chromatic aberrations further complicate accurate color reproduction in imaging systems.

Purpose of the Study:

To propose and demonstrate a novel micro-lens array (MLA) design.
To achieve simultaneous correction of chromatic aberrations and spatial separation of color channels onto distinct pixels.
To enhance color fidelity and object point localization in CCD-based imaging.

Main Methods:

Design of a micro-lens array (MLA) with micron-scale features etched onto a convex optical surface.
Utilizing a commercially available aspheric condenser lens as a base.
Fabrication via fluid jet polishing, achieving a surface form accuracy of 0.24 µm root mean square (rms).

Main Results:

Successful design and fabrication of a micro-lens array (MLA) with precise optical form.
Demonstration of simultaneous chromatic aberration correction and color channel separation.
Experimental validation showing distinct, spatially separated spots (10-15 µm diameter) for different wavelengths.

Conclusions:

The developed micro-lens array (MLA) effectively addresses the inherent limitations of CCD color encoding.
This MLA technology enables precise color channel separation and chromatic aberration correction.
The findings present a significant advancement for high-fidelity color imaging systems utilizing CCD sensors.