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Hyperspectral imager with folded metasurface optics

Faraji-Dana, MohammadSadegh and Arbabi, Ehsan and Kwon, Hyounghan and Kamali, Seyedeh Mahsa and Arbabi, Amir and Bartholomew, John G. and Faraon, Andrei (2019) Hyperspectral imager with folded metasurface optics. ACS Photonics, 6 (8). pp. 2161-2167. ISSN 2330-4022.

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Hyperspectral imaging is a key characterization technique used in various areas of science and technology. Almost all implementations of hyperspectral imagers rely on bulky optics including spectral filters and moving or tunable elements. Here, we propose and demonstrate a line-scanning folded metasurface hyperspectral imager (HSI) that is fabricated in a single lithographic step on a 1 mm thick glass substrate. The HSI is composed of four metasurfaces, three reflective and one transmissive, that are designed to collectively disperse and focus light of different wavelengths and incident angles on a focal plane parallel to the glass substrate. With a total volume of 8.5 mm^3, the HSI has spectral and angular resolutions of ∼1.5 nm and 0.075°, over the 750–850 nm and −15° to +15° degree ranges, respectively. Being compact, light weight, and easy to fabricate and integrate with image sensors and electronics, the metasurface HSI opens up new opportunities for utilizing hyperspectral imaging where strict volume and weight constraints exist. In addition, the demonstrated HSI exemplifies the utilization of metasurfaces as high-performance diffractive optical elements for implementation of advanced optical systems.

Item Type:Article
Related URLs:
URLURL TypeDescription
Arbabi, Ehsan0000-0002-5328-3863
Kamali, Seyedeh Mahsa0000-0002-6968-811X
Arbabi, Amir0000-0001-8831-7552
Bartholomew, John G.0000-0003-0780-2471
Faraon, Andrei0000-0002-8141-391X
Additional Information:© 2019 American Chemical Society. Received: May 22, 2019; Published: July 30, 2019. This work was supported by Samsung Electronics. M.F. was partly supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). The device nanofabrication was performed at the Kavli Nanoscience Institute at Caltech. The authors thank Dr. Jonathan Kindem for his help in measurements using the tunable laser. Author Contributions: M.F., E.A., A.A., and A.F. conceived the experiment. M.F., E.A., and H.K. fabricated the samples. M.F., E.A., S.M.K., H.K., and J.G.B. performed the simulations and measurements and analyzed the data. M.F., E.A., A.A., and A.F. cowrote the manuscript. All authors discussed the results and commented on the manuscript. The authors declare no competing financial interest.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Samsung ElectronicsUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords:optical metasurfaces, diffractive optics, imaging spectrometer, nanoscale materials, hyperspectral imaging
Issue or Number:8
Record Number:CaltechAUTHORS:20190731-100331032
Persistent URL:
Official Citation:Hyperspectral Imager with Folded Metasurface Optics. MohammadSadegh Faraji-Dana, Ehsan Arbabi, Hyounghan Kwon, Seyedeh Mahsa Kamali, Amir Arbabi, John G. Bartholomew, and Andrei Faraon. ACS Photonics 2019 6 (8), 2161-2167. DOI: 10.1021/acsphotonics.9b00744
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97546
Deposited By: Tony Diaz
Deposited On:31 Jul 2019 20:00
Last Modified:03 Oct 2019 21:32

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