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Snapshot fiber spectral imaging using speckle correlations and compressive sensing

Snapshot fiber spectral imaging using speckle correlations and compressive sensing
Snapshot fiber spectral imaging using speckle correlations and compressive sensing

Snapshot spectral imaging is rapidly gaining interest for remote sensing applications. Acquiring spatial and spectral data within one image promotes fast measurement times, and reduces the need for stabilized scanning imaging systems. Many current snapshot technologies, which rely on gratings or prisms to characterize wavelength information, are difficult to reduce in size for portable hyperspectral imaging. Here, we show that a multicore multimode fiber can be used as a compact spectral imager with sub-nanometer resolution, by encoding spectral information within a monochrome CMOS camera. We characterize wavelength-dependent speckle patterns for up to 3000 fiber cores over a broad wavelength range. A clustering algorithm is employed in combination with l1-minimization to limit data collection at the acquisition stage for the reconstruction of spectral images that are sparse in the wavelength domain. We also show that in the non-compressive regime these techniques are able to accurately reconstruct broadband information.

1094-4087
32302-32316
French, Rebecca
d6d6a85a-e351-4cc8-ae4a-827c35fe6b64
Gigan, Sylvain
f2f2026a-fbe0-4fbe-b3a1-d8f7b35cdd58
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
French, Rebecca
d6d6a85a-e351-4cc8-ae4a-827c35fe6b64
Gigan, Sylvain
f2f2026a-fbe0-4fbe-b3a1-d8f7b35cdd58
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9

French, Rebecca, Gigan, Sylvain and Muskens, Otto L. (2018) Snapshot fiber spectral imaging using speckle correlations and compressive sensing. Optics Express, 26 (24), 32302-32316. (doi:10.1364/OE.26.032302).

Record type: Article

Abstract

Snapshot spectral imaging is rapidly gaining interest for remote sensing applications. Acquiring spatial and spectral data within one image promotes fast measurement times, and reduces the need for stabilized scanning imaging systems. Many current snapshot technologies, which rely on gratings or prisms to characterize wavelength information, are difficult to reduce in size for portable hyperspectral imaging. Here, we show that a multicore multimode fiber can be used as a compact spectral imager with sub-nanometer resolution, by encoding spectral information within a monochrome CMOS camera. We characterize wavelength-dependent speckle patterns for up to 3000 fiber cores over a broad wavelength range. A clustering algorithm is employed in combination with l1-minimization to limit data collection at the acquisition stage for the reconstruction of spectral images that are sparse in the wavelength domain. We also show that in the non-compressive regime these techniques are able to accurately reconstruct broadband information.

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More information

Accepted/In Press date: 14 October 2018
e-pub ahead of print date: 21 November 2018
Published date: 26 November 2018

Identifiers

Local EPrints ID: 426767
URI: https://eprints.soton.ac.uk/id/eprint/426767
ISSN: 1094-4087
PURE UUID: 27505e54-50f8-47dd-9531-f7ef78ef041b
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504

Catalogue record

Date deposited: 12 Dec 2018 17:30
Last modified: 14 Mar 2019 01:38

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