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High contrast mid-infrared chalcogenide waveguides for biosensing applications

High contrast mid-infrared chalcogenide waveguides for biosensing applications
High contrast mid-infrared chalcogenide waveguides for biosensing applications
Mid-infrared spectral band from 2 µm - 20 µm is ideal for label-free biosensing as the fundamental vibrations of many significant biomolecules take place in this region. Mid-infrared absorption spectroscopy using FTIR has been exploited for the last few decades to provide sensing capabilities for biomedical diagnostics. However, the sensitivity and the detection limit of the sample under test can be tremendously improved by using the evanescent field based integrated planar waveguide devices. In this paper, we present the fabrication and characterization results of chalcogenide waveguides transparent in the mid-infrared region for such applications. GeTe4 waveguides on ZnSe substrates were fabricated using lift-off technique. Lift-off resist was used to create the patterns on ZnSe substrate using photolithography and GeTe4 was deposited on these patterned samples using RF sputtering. The lift-off resist was stripped off to obtain the desired channels. The waveguides were characterized in both mid wave (2.5 µm - 3.7 µm) and long wave (6.4 µm - 7.5 µm) spectral bands using optical parametric oscillator-based laser source and quantum cascade laser, respectively [1]. Fig. 1 (a) and (b) show the cross-section and top view of the infrared camera images of the output facet of a GeTe4 channel waveguide showing light guidance at lambda = 3.5 µm and lambda = 6.5 µm, respectively.
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b

Mittal, Vinita, Wilkinson, James S. and Murugan, Ganapathy Senthil (2015) High contrast mid-infrared chalcogenide waveguides for biosensing applications. Glass Reflections, United Kingdom. 07 - 09 Sep 2015.

Record type: Conference or Workshop Item (Paper)

Abstract

Mid-infrared spectral band from 2 µm - 20 µm is ideal for label-free biosensing as the fundamental vibrations of many significant biomolecules take place in this region. Mid-infrared absorption spectroscopy using FTIR has been exploited for the last few decades to provide sensing capabilities for biomedical diagnostics. However, the sensitivity and the detection limit of the sample under test can be tremendously improved by using the evanescent field based integrated planar waveguide devices. In this paper, we present the fabrication and characterization results of chalcogenide waveguides transparent in the mid-infrared region for such applications. GeTe4 waveguides on ZnSe substrates were fabricated using lift-off technique. Lift-off resist was used to create the patterns on ZnSe substrate using photolithography and GeTe4 was deposited on these patterned samples using RF sputtering. The lift-off resist was stripped off to obtain the desired channels. The waveguides were characterized in both mid wave (2.5 µm - 3.7 µm) and long wave (6.4 µm - 7.5 µm) spectral bands using optical parametric oscillator-based laser source and quantum cascade laser, respectively [1]. Fig. 1 (a) and (b) show the cross-section and top view of the infrared camera images of the output facet of a GeTe4 channel waveguide showing light guidance at lambda = 3.5 µm and lambda = 6.5 µm, respectively.

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More information

e-pub ahead of print date: 2015
Venue - Dates: Glass Reflections, United Kingdom, 2015-09-07 - 2015-09-09
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 381817
URI: https://eprints.soton.ac.uk/id/eprint/381817
PURE UUID: 6e850c19-0b29-408e-b7eb-ca5d6e947bf9
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 Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273

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Date deposited: 14 Oct 2015 16:37
Last modified: 20 Nov 2018 01:37

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