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Fourier-transform on-chip microspectrometers

Fourier-transform on-chip microspectrometers
Fourier-transform on-chip microspectrometers
We present some of the latest developments in silicon-based Fourier-transform microspectrometers for the near and mid-infrared. The devices comprise waveguide arrays of Mach-Zehnder interferometers with linearly increasing optical path differences, enabling scan-less spectral retrieval with large radiant throughput. Resolutions down to 40pm are experimentally demonstrated. Spatial heterodyne Fourier-transform (SHFT) spectrometry is an interferometric technique which circumvents the need of moving elements and provides an increased έtendue. The SHFT scheme can be implemented with a waveguide array of Mach-Zehnder interferometers (MZI) with linearly increasing optical path differences. The high refractive index contrast of the SOI platform and the waveguide bend radius of ~ 5 µm readily allow achieving high resolutions in a reduced footprint. We report three alternative implementations of the SHFT principle in SOI waveguides. Firstly, a SHFT chip with Si-wire microphotonic spirals, reaching a resolution of 40 pm at a central wavelength near 1.5 µm. Secondly, a SHFT micro-spectrometer with subwavelength gratings for refractive index engineering of the optical delay lines. Finally, an extension of the SHFT scheme to the mid-infrared, addressing specific challenges of this spectral region such as efficient coupling and power splitting structures, and robust performance over a substantially broader free spectral range. SHFT spectrometers are promising for a wide range of applications, including chemical and biological sensing, astronomy, communications, hand-held spectroscopy, and sensing from satellites or planetary rowers. Furthermore, the resolution of these devices can be readily scaled up to very long optical delays, opening a new pathway toward possibly overcoming current resolution limits of state-of-the-art spectroscopic instruments.
Velasco, A.V.
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Cheben, P.
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Calvo, M.L.
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Delage, A.
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Schmid, J.H.
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Lapointe, J.
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Janz, S.
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Xu, D-X.
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Vachon, M.
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Nedeljković, M.
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Khokhar, A.Z.
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Mashanovich, G.Z.
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Herrero-Bermello, A.
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Corredera, P.
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Velasco, A.V.
b211e06c-bed5-4056-b5b1-253aafb8de5e
Cheben, P.
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Calvo, M.L.
7624ea93-6e3e-43a0-916e-f1725b3c346b
Delage, A.
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Schmid, J.H.
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Lapointe, J.
05cca97f-c371-4ae9-9747-af3a5c6b38fb
Janz, S.
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Xu, D-X.
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Vachon, M.
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Nedeljković, M.
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Khokhar, A.Z.
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Mashanovich, G.Z.
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Herrero-Bermello, A.
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Corredera, P.
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Velasco, A.V., Cheben, P., Calvo, M.L., Delage, A., Schmid, J.H., Lapointe, J., Janz, S., Xu, D-X., Vachon, M., Nedeljković, M., Khokhar, A.Z., Mashanovich, G.Z., Herrero-Bermello, A. and Corredera, P. (2016) Fourier-transform on-chip microspectrometers. Progress in Electromagnetic Research Symposium, , Shanghai, China. 07 - 10 Aug 2016. (doi:10.1109/PIERS.2016.7734234).

Record type: Conference or Workshop Item (Paper)

Abstract

We present some of the latest developments in silicon-based Fourier-transform microspectrometers for the near and mid-infrared. The devices comprise waveguide arrays of Mach-Zehnder interferometers with linearly increasing optical path differences, enabling scan-less spectral retrieval with large radiant throughput. Resolutions down to 40pm are experimentally demonstrated. Spatial heterodyne Fourier-transform (SHFT) spectrometry is an interferometric technique which circumvents the need of moving elements and provides an increased έtendue. The SHFT scheme can be implemented with a waveguide array of Mach-Zehnder interferometers (MZI) with linearly increasing optical path differences. The high refractive index contrast of the SOI platform and the waveguide bend radius of ~ 5 µm readily allow achieving high resolutions in a reduced footprint. We report three alternative implementations of the SHFT principle in SOI waveguides. Firstly, a SHFT chip with Si-wire microphotonic spirals, reaching a resolution of 40 pm at a central wavelength near 1.5 µm. Secondly, a SHFT micro-spectrometer with subwavelength gratings for refractive index engineering of the optical delay lines. Finally, an extension of the SHFT scheme to the mid-infrared, addressing specific challenges of this spectral region such as efficient coupling and power splitting structures, and robust performance over a substantially broader free spectral range. SHFT spectrometers are promising for a wide range of applications, including chemical and biological sensing, astronomy, communications, hand-held spectroscopy, and sensing from satellites or planetary rowers. Furthermore, the resolution of these devices can be readily scaled up to very long optical delays, opening a new pathway toward possibly overcoming current resolution limits of state-of-the-art spectroscopic instruments.

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More information

Published date: 2016
Venue - Dates: Progress in Electromagnetic Research Symposium, , Shanghai, China, 2016-08-07 - 2016-08-10

Identifiers

Local EPrints ID: 442564
URI: http://eprints.soton.ac.uk/id/eprint/442564
PURE UUID: 0c1224f8-c06b-400f-8e48-17a56a7a21e5
ORCID for M. Nedeljković: ORCID iD orcid.org/0000-0002-9170-7911

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Date deposited: 20 Jul 2020 16:30
Last modified: 13 Dec 2021 03:13

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Contributors

Author: A.V. Velasco
Author: P. Cheben
Author: M.L. Calvo
Author: A. Delage
Author: J.H. Schmid
Author: J. Lapointe
Author: S. Janz
Author: D-X. Xu
Author: M. Vachon
Author: M. Nedeljković ORCID iD
Author: A.Z. Khokhar
Author: A. Herrero-Bermello
Author: P. Corredera

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