Snapshot spectral imaging with parallel metasystems
Andrew McClung1, Sarath Samudrala1, Mahsa Torfeh1
1Department of Electrical and Computer Engineering, University of Massachusetts Amherst, 151 Holdsworth Way, Amherst, MA 01003, USA.
Science Advances
|September 19, 2020
Summary
We developed a compact snapshot spectral imager using metasystems. This lightweight instrument simultaneously captures 20 spectral channels, enabling advanced remote sensing and consumer electronics applications.
Area of Science:
- Optics and Photonics
- Metasurface Technology
- Remote Sensing Instrumentation
Background:
- Spectral imagers are crucial metrological tools in science, particularly for remote sensing.
- Existing spectral imagers can be bulky and suffer from issues like chromatic aberration.
Purpose of the Study:
- To propose and demonstrate a novel, compact snapshot spectral imager.
- To leverage parallel optical processing with metasystem arrays for improved spectral imaging.
Main Methods:
- Designed a multi-aperture spectral imager using arrays of metasystems.
- Integrated metasurface-tuned filters and metalens doublets for 20 spectral channels (795-980 nm).
- Incorporated absorptive field stops to minimize cross-talk between channels.
Main Results:
- Achieved a lightweight imager (<20 mg) capable of simultaneous multi-channel spectral acquisition.
- Demonstrated the instrument's functionality with both still images and video.
- Showcased mitigation of chromatic aberration through narrowband filtering.
Conclusions:
- Parallel optical processing with metasystem arrays enables novel, compact spectral imaging instruments.
- The developed imager holds promise for scientific studies and consumer electronics.
- Potential for aberration-free color cameras at visible wavelengths.
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