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Imaging through highly scattering environments using ballistic and quasi-ballistic light in a common-path Sagnac interferometer

Imaging through highly scattering environments using ballistic and quasi-ballistic light in a common-path Sagnac interferometer
Imaging through highly scattering environments using ballistic and quasi-ballistic light in a common-path Sagnac interferometer
The survival of time-reversal symmetry in the presence of strong multiple scattering lies at the heart of some of the most robust interference effects of light in complex media. Here, the use of time-reversed light paths for imaging in highly scattering environments is investigated. A common-path Sagnac interferometer is constructed that is able to detect objects behind a layer of strongly scattering material at up to 14 mean free paths of total attenuation length. A spatial offset between the two light paths is used to suppress non-specific scattering contributions, limiting the signal to the volume of overlap. Scaling of the specific signal intensity indicates a transition from ballistic to quasi-ballistic contributions as the scattering thickness is increased. The characteristic frequency dependence for the coherent modulation signal provides a path length dependent signature, while the spatial overlap requirement allows for short-range 3D imaging. The technique of common-path, bistatic interferometry offers a conceptually novel approach that could open new applications in diverse areas such as medical imaging, machine vision, sensors, and lidar.
1094-4087
10386-10399
Dykes, Jesse
2bcd5bbb-340b-4558-9aea-a4688d6a868f
Nazer, Zeina
1f81566d-fd03-4203-a5f3-52180e539f63
Mosk, Allard P.
dfd74ce2-7d3f-4880-a3ca-c69ec9344cfc
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Dykes, Jesse
2bcd5bbb-340b-4558-9aea-a4688d6a868f
Nazer, Zeina
1f81566d-fd03-4203-a5f3-52180e539f63
Mosk, Allard P.
dfd74ce2-7d3f-4880-a3ca-c69ec9344cfc
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9

Dykes, Jesse, Nazer, Zeina, Mosk, Allard P. and Muskens, Otto L. (2020) Imaging through highly scattering environments using ballistic and quasi-ballistic light in a common-path Sagnac interferometer. Optics Express, 28 (7), 10386-10399. (doi:10.1364/OE.387503).

Record type: Article

Abstract

The survival of time-reversal symmetry in the presence of strong multiple scattering lies at the heart of some of the most robust interference effects of light in complex media. Here, the use of time-reversed light paths for imaging in highly scattering environments is investigated. A common-path Sagnac interferometer is constructed that is able to detect objects behind a layer of strongly scattering material at up to 14 mean free paths of total attenuation length. A spatial offset between the two light paths is used to suppress non-specific scattering contributions, limiting the signal to the volume of overlap. Scaling of the specific signal intensity indicates a transition from ballistic to quasi-ballistic contributions as the scattering thickness is increased. The characteristic frequency dependence for the coherent modulation signal provides a path length dependent signature, while the spatial overlap requirement allows for short-range 3D imaging. The technique of common-path, bistatic interferometry offers a conceptually novel approach that could open new applications in diverse areas such as medical imaging, machine vision, sensors, and lidar.

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More information

Accepted/In Press date: 2 March 2020
e-pub ahead of print date: 25 March 2020
Published date: 30 March 2020

Identifiers

Local EPrints ID: 439480
URI: http://eprints.soton.ac.uk/id/eprint/439480
ISSN: 1094-4087
PURE UUID: a6174ee6-c6d5-4dfa-bc97-ddba8a45440b
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504

Catalogue record

Date deposited: 24 Apr 2020 16:30
Last modified: 07 Oct 2020 01:56

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