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Modelling of a miniature mid-IR thermo-optic spectrometer on chip based on a GaAs/In0.49Ga0.51P waveguide platform

Modelling of a miniature mid-IR thermo-optic spectrometer on chip based on a GaAs/In0.49Ga0.51P waveguide platform
Modelling of a miniature mid-IR thermo-optic spectrometer on chip based on a GaAs/In0.49Ga0.51P waveguide platform

Spectrometers based on integrated optical waveguides, as opposed to free space optics, provide many advantages including robustness, compactness, and low cost, combined with alignment-free and low-power operation. Interest in such a chip-based approach for integrated spectrometers is growing, but the integrated spectrometers demonstrated so far have largely been limited to operation at wavelengths up to about 5μm due to intrinsic material absorption. In this work, we design and model an on-chip thermo-optically tuneable spectrometer based on a novel waveguide material platform consisting of GaAs (core) on InGaP (cladding), with potential to operate in the wavelength range between 1 and 17μm to fully cover the Mid-IR molecular fingerprint region. The strong thermo-optic effect exhibited by both of these materials makes the platform a very promising candidate for on-chip spectroscopy. A series of simulations were performed to predict the optical and thermal properties of the device. We show that with the proper optical and thermal optimisation of the platform and by using an interferometer with spiralled waveguides of 60 mm length, the device can effectively achieve a resolution of 10 cm −1 with a maximum temperature excursion of about 83 K and at the cost of a few tens of Watts of power.

MZI, Mid-infrared, Modelling, Semiconductors, Spectrometer, Thermo-optic
0030-4018
Mourgelas, Vasileios
7f9f5519-f86c-4c96-8a5d-a97c0ec9fdb5
Sessions, Neil
ee737092-56b4-403e-a2f9-764e07e42625
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Mourgelas, Vasileios
7f9f5519-f86c-4c96-8a5d-a97c0ec9fdb5
Sessions, Neil
ee737092-56b4-403e-a2f9-764e07e42625
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b

Mourgelas, Vasileios, Sessions, Neil, Wilkinson, James S. and Murugan, Ganapathy Senthil (2021) Modelling of a miniature mid-IR thermo-optic spectrometer on chip based on a GaAs/In0.49Ga0.51P waveguide platform. Optics Communications, 495, [127044]. (doi:10.1016/j.optcom.2021.127044).

Record type: Article

Abstract

Spectrometers based on integrated optical waveguides, as opposed to free space optics, provide many advantages including robustness, compactness, and low cost, combined with alignment-free and low-power operation. Interest in such a chip-based approach for integrated spectrometers is growing, but the integrated spectrometers demonstrated so far have largely been limited to operation at wavelengths up to about 5μm due to intrinsic material absorption. In this work, we design and model an on-chip thermo-optically tuneable spectrometer based on a novel waveguide material platform consisting of GaAs (core) on InGaP (cladding), with potential to operate in the wavelength range between 1 and 17μm to fully cover the Mid-IR molecular fingerprint region. The strong thermo-optic effect exhibited by both of these materials makes the platform a very promising candidate for on-chip spectroscopy. A series of simulations were performed to predict the optical and thermal properties of the device. We show that with the proper optical and thermal optimisation of the platform and by using an interferometer with spiralled waveguides of 60 mm length, the device can effectively achieve a resolution of 10 cm −1 with a maximum temperature excursion of about 83 K and at the cost of a few tens of Watts of power.

Text
Modelling of a miniature mid-IR thermo-optic spectrometer on chip based on a GaAs In0.49Ga0.51P waveguide platform - Accepted Manuscript
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More information

Accepted/In Press date: 18 April 2021
e-pub ahead of print date: 21 April 2021
Published date: 15 September 2021
Keywords: MZI, Mid-infrared, Modelling, Semiconductors, Spectrometer, Thermo-optic

Identifiers

Local EPrints ID: 448793
URI: http://eprints.soton.ac.uk/id/eprint/448793
ISSN: 0030-4018
PURE UUID: 15b56dbe-c365-4658-88fa-74247bba4f09
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

Catalogue record

Date deposited: 06 May 2021 16:30
Last modified: 08 Jun 2021 04:01

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