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A Spatiotemporal Tunable Filter Array Chip for Video-Rate Hyperspectral Imaging.

Zijian Lin^1,2,3, Tingbiao Guo¹, Zhi Zhang¹

¹Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310058, People's Republic of China.

|February 3, 2025

Summary

Researchers developed a novel spatiotemporal filter array chip for miniaturized hyperspectral imaging. This innovation overcomes resolution trade-offs, enabling simultaneous high spatial, temporal, and spectral performance.

Keywords:

chip hyperpectral imaging spatiotemporal tunable filter video rate

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Area of Science:

Optics and Photonics
Imaging Technology
Materials Science

Background:

Miniaturized spectral imagers face limitations in simultaneously achieving high spatial, temporal, and spectral resolutions.
Existing technologies struggle to balance these critical parameters for practical applications.

Purpose of the Study:

To address the inherent trade-offs among spatial, temporal, and spectral resolutions in miniaturized spectral imaging systems.
To introduce a novel spatiotemporal filter array chip for enhanced hyperspectral imaging capabilities.

Main Methods:

Integration of a 2 × 2 Fabry-Perot filter array within a tunable liquid crystal spectral modulator.
Development of a transmission-type tunable filter for increased filtering channels and modulation capabilities.
Hardware-based spatiotemporal channel enhancement for simultaneous resolution improvements.

Main Results:

Achieved a spectral resolution of approximately 0.5 nm in the visible spectrum.
Demonstrated a high frame rate of 60 Hz.
Obtained a spatial resolution of up to 25 line pairs per millimeter (lp/mm) without post-interpolation.

Conclusions:

The developed spatiotemporal filter array chip effectively overcomes resolution limitations in miniaturized hyperspectral imaging.
The proposed system offers a balanced and superior performance in spatial, temporal, and spectral resolutions.
This technology paves the way for more advanced and practical miniaturized hyperspectral imaging solutions.