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Integrated switching circuit for low-noise self-referenced mid-infrared absorption sensing using silicon waveguides

Integrated switching circuit for low-noise self-referenced mid-infrared absorption sensing using silicon waveguides
Integrated switching circuit for low-noise self-referenced mid-infrared absorption sensing using silicon waveguides

We report a new method of accurately measuring the mid-infrared absorption of fluid analytes using on-chip waveguides that allows measurements to be referenced for noise and drift reduction whilst using only a single external detector. A silicon-on-insulator waveguide circuit integrated with a microfluidic channel is made in which a pair of switches alternate light between an evanescent absorption sensor waveguide and a reference waveguide at a rate of a few kHz, thus allowing low frequency common noise components to be removed from the measurement, and leading to a reduction in the noise floor by a factor of 11 compared to a simple waveguide absorption sensor. The device was verified by using it to detect an Isopropyl alcohol (IPA) absorption peak at a wavelength of 3.77 μm.

Absorption, Absorption Spectroscopy, Frequency measurement, Microfluidics, Mid-infrared, Optical Switching, Optical switches, Optical waveguides, Silicon Photonics, Waveguide lasers, Wavelength measurement, optical switching, absorption spectroscopy, silicon photonics, microfluidics
1943-0655
Qi, Yanli
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Zheng, Zhexuan
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Banakar, Mehdi
ad56fc0a-728c-4abb-8be5-74318bb2758e
Wu, Yangbo
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Gangnaik, Anushka
8b44e462-2a3f-4295-a9ff-1a2f7c09f14d
Rowe, David
a0e0fe82-5e29-42b8-b370-5236a722f015
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Butement, Jonathan
581ce321-f1af-4a2f-870a-9d8d45133586
Wilkinson, James S
73483cf3-d9f2-4688-9b09-1c84257884ca
Mashanovich, Goran
c806e262-af80-4836-b96f-319425060051
Nedeljković, Miloš
b64e21c2-1b95-479d-a35c-3456dff8c796
Qi, Yanli
e4be1a4a-3af6-44e5-9597-8e41bd10a8b7
Zheng, Zhexuan
946c6efa-fbb3-409b-8577-7377c74aea79
Banakar, Mehdi
ad56fc0a-728c-4abb-8be5-74318bb2758e
Wu, Yangbo
69808be6-a1e0-4622-b753-ab31a275d41a
Gangnaik, Anushka
8b44e462-2a3f-4295-a9ff-1a2f7c09f14d
Rowe, David
a0e0fe82-5e29-42b8-b370-5236a722f015
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Butement, Jonathan
581ce321-f1af-4a2f-870a-9d8d45133586
Wilkinson, James S
73483cf3-d9f2-4688-9b09-1c84257884ca
Mashanovich, Goran
c806e262-af80-4836-b96f-319425060051
Nedeljković, Miloš
b64e21c2-1b95-479d-a35c-3456dff8c796

Qi, Yanli, Zheng, Zhexuan, Banakar, Mehdi, Wu, Yangbo, Gangnaik, Anushka, Rowe, David, Mittal, Vinita, Butement, Jonathan, Wilkinson, James S, Mashanovich, Goran and Nedeljković, Miloš (2021) Integrated switching circuit for low-noise self-referenced mid-infrared absorption sensing using silicon waveguides. IEEE Photonics Journal, 13 (6), [6600110]. (doi:10.1109/JPHOT.2021.3121331).

Record type: Article

Abstract

We report a new method of accurately measuring the mid-infrared absorption of fluid analytes using on-chip waveguides that allows measurements to be referenced for noise and drift reduction whilst using only a single external detector. A silicon-on-insulator waveguide circuit integrated with a microfluidic channel is made in which a pair of switches alternate light between an evanescent absorption sensor waveguide and a reference waveguide at a rate of a few kHz, thus allowing low frequency common noise components to be removed from the measurement, and leading to a reduction in the noise floor by a factor of 11 compared to a simple waveguide absorption sensor. The device was verified by using it to detect an Isopropyl alcohol (IPA) absorption peak at a wavelength of 3.77 μm.

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More information

Accepted/In Press date: 15 October 2021
e-pub ahead of print date: 19 October 2021
Published date: 1 December 2021
Keywords: Absorption, Absorption Spectroscopy, Frequency measurement, Microfluidics, Mid-infrared, Optical Switching, Optical switches, Optical waveguides, Silicon Photonics, Waveguide lasers, Wavelength measurement, optical switching, absorption spectroscopy, silicon photonics, microfluidics

Identifiers

Local EPrints ID: 452992
URI: http://eprints.soton.ac.uk/id/eprint/452992
ISSN: 1943-0655
PURE UUID: f22a2f31-7525-41dc-83b5-2df6140deb09
ORCID for David Rowe: ORCID iD orcid.org/0000-0002-1167-150X
ORCID for Vinita Mittal: ORCID iD orcid.org/0000-0003-4836-5327
ORCID for James S Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697
ORCID for Miloš Nedeljković: ORCID iD orcid.org/0000-0002-9170-7911

Catalogue record

Date deposited: 07 Jan 2022 12:10
Last modified: 28 Apr 2022 02:11

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Contributors

Author: Yanli Qi
Author: Zhexuan Zheng
Author: Mehdi Banakar
Author: Yangbo Wu
Author: Anushka Gangnaik
Author: David Rowe ORCID iD
Author: Vinita Mittal ORCID iD
Author: Jonathan Butement

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