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Narrowband multispectral filter set for visible band.

K Walls¹, Q Chen, J Grant

¹School of Engineering, University of Glasgow, Glasgow G12 8LT, UK.

|October 6, 2012

Summary

Researchers developed a novel narrowband Fabry-Pérot multispectral filter set for visible light, ideal for image sensors. This design simplifies fabrication by adjusting optical length, yielding 23 filters with narrow bandwidths.

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Area of Science:

Optics and Photonics
Materials Science
Electrical Engineering

Background:

Fabry-Pérot filters are crucial for spectral imaging but often require complex fabrication.
Integration with complementary-metal oxide-semiconductor (CMOS) image sensors demands compact and efficient filter solutions.
Existing multispectral filter sets can be bulky and costly, limiting their application.

Purpose of the Study:

To design and fabricate a narrowband Fabry-Pérot multispectral filter set for the visible spectrum (400-750 nm).
To develop a fabrication method suitable for integration with CMOS image sensors.
To achieve high-performance filters with reduced fabrication complexity.

Main Methods:

A simplified fabrication approach was employed by fixing the physical cavity length and tuning the effective optical length.
Electron-beam lithography was used to pattern sub-wavelength hole arrays in a silicon nitride cavity layer.
The cavity was backfilled with poly(methyl methacrylate) and bounded by aluminum mirrors to create 23 distinct filters.

Main Results:

The fabricated filters exhibit full-width half-maximum (FWHM) bandwidths ranging from 22-46 nm.
The novel design successfully created 23 narrowband filters within the visible spectrum.
For colorimetric reproduction, a set of 10 filters achieved a color difference (CIEDE2000) of 0.072, outperforming trichromatic filters.

Conclusions:

A simplified fabrication process for narrowband Fabry-Pérot multispectral filters has been successfully demonstrated.
The developed filter set is suitable for integration with CMOS image sensors, offering improved colorimetric reproduction.
This technology advances multispectral imaging capabilities for various applications, including consumer electronics and scientific instrumentation.