The University of Southampton
University of Southampton Institutional Repository

Mid-infrared waveguide evanescent wave sensing

Mid-infrared waveguide evanescent wave sensing
Mid-infrared waveguide evanescent wave sensing
Mid-Infrared (Mid-IR) techniques have gained considerable attention because of their inherent molecular selectivity and their potential for rapid label-free detection in applications such as water quality and environmental monitoring, security, food safety, and point-of-care diagnostics. Waveguide evanescent-field-based Mid-IR spectroscopy can detect analytes at very low concentrations using molecular absorption fingerprints, potentially offering high sensitivity and selectivity over a wide range of compounds. Moreover, significant footprint reduction compared to ATR-based FTIR measurements can be achieved with optical waveguide-based Mid-IR sensing through integration of various optoelectronic and microfluidic components realizing fully packaged lab-on-a-chip systems.
Recently we have developed low-loss chalcogenide optical waveguides and demonstrated waveguiding in the mid-wave and long-wave infrared spectral bands. High contrast GeTe4 and ZnSe channel waveguides were fabricated on bulk substrates and on silicon wafers (with suitable optical isolation layers) using lift-off and dry etching techniques after photolithographically patterning the thin films. These waveguides were exhibiting optical losses as low as 0.6 dB/cm in the mid-wave IR band and were validated for the Mid-IR evanescent wave spectroscopy with water and IPA. We have also demonstrated the effectiveness of simple paper-based fluidics with our waveguides.
In addition, we investigate a new family of free-standing Ta2O5 rib waveguides for trace gas detection with evanescent field overlap with the surrounding medium (air) up to about 70%. The waveguides are being fabricated and the fabrication and characterization results will be presented.
10914-13
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Vlk, Marek
9c00e823-44fc-48cb-8ced-f3f906077335
Jágerská, Jana
c77f075d-7018-4703-8745-ed4cd6398228
Wilkinson, James S
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Vlk, Marek
9c00e823-44fc-48cb-8ced-f3f906077335
Jágerská, Jana
c77f075d-7018-4703-8745-ed4cd6398228
Wilkinson, James S
73483cf3-d9f2-4688-9b09-1c84257884ca

Murugan, Ganapathy Senthil, Mittal, Vinita, Vlk, Marek, Jágerská, Jana and Wilkinson, James S (2019) Mid-infrared waveguide evanescent wave sensing. Photonics West, The Moscone Center, United States. 01 - 06 Feb 2019. pp. 10914-13 . (doi:10.1117/12.2508591).

Record type: Conference or Workshop Item (Paper)

Abstract

Mid-Infrared (Mid-IR) techniques have gained considerable attention because of their inherent molecular selectivity and their potential for rapid label-free detection in applications such as water quality and environmental monitoring, security, food safety, and point-of-care diagnostics. Waveguide evanescent-field-based Mid-IR spectroscopy can detect analytes at very low concentrations using molecular absorption fingerprints, potentially offering high sensitivity and selectivity over a wide range of compounds. Moreover, significant footprint reduction compared to ATR-based FTIR measurements can be achieved with optical waveguide-based Mid-IR sensing through integration of various optoelectronic and microfluidic components realizing fully packaged lab-on-a-chip systems.
Recently we have developed low-loss chalcogenide optical waveguides and demonstrated waveguiding in the mid-wave and long-wave infrared spectral bands. High contrast GeTe4 and ZnSe channel waveguides were fabricated on bulk substrates and on silicon wafers (with suitable optical isolation layers) using lift-off and dry etching techniques after photolithographically patterning the thin films. These waveguides were exhibiting optical losses as low as 0.6 dB/cm in the mid-wave IR band and were validated for the Mid-IR evanescent wave spectroscopy with water and IPA. We have also demonstrated the effectiveness of simple paper-based fluidics with our waveguides.
In addition, we investigate a new family of free-standing Ta2O5 rib waveguides for trace gas detection with evanescent field overlap with the surrounding medium (air) up to about 70%. The waveguides are being fabricated and the fabrication and characterization results will be presented.

Full text not available from this repository.

More information

Published date: 5 February 2019
Additional Information: Invited
Venue - Dates: Photonics West, The Moscone Center, United States, 2019-02-01 - 2019-02-06

Identifiers

Local EPrints ID: 438110
URI: http://eprints.soton.ac.uk/id/eprint/438110
PURE UUID: de3fcd4b-789e-41ce-adf1-09b03a508acc
ORCID for Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273
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

Catalogue record

Date deposited: 28 Feb 2020 17:31
Last modified: 13 Aug 2020 16:37

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×