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Optical sensing with Anderson-localised light

Optical sensing with Anderson-localised light
Optical sensing with Anderson-localised light
We show that fabrication imperfections in silicon nitride photonic crystal waveguides can be used as a resource to efficiently confine light in the Anderson-localised regime and add functionalities to photonic devices. Our results prove that disorder-induced localisation of light can be utilised to realise an alternative class of high-quality optical sensors operating at room temperature. We measure wavelength shifts of optical resonances as large as 15.2 nm, more than 100 times the spectral linewidth of 0.15 nm, for a refractive index change of about 0.38. By studying the temperature dependence of the optical properties of the system, we report wavelength shifts of up to about 2 nm and increases of more than a factor 2 in the quality factor of the cavity resonances, when going from room to cryogenic temperatures. Such a device can allow simultaneous sensing of both local contaminants and temperature variations, monitored by tens of optical resonances spontaneously appearing along a single photonic crystal waveguide. Our findings demonstrate the potential of Anderson-localised light in photonic crystals for scalable and efficient optical sensors operating in the visible and near-infrared range of wavelengths.
0003-6951
Trojak, Oliver, Joe
795f56e4-951b-48ec-95c3-8af4e0d8f3d5
Crane, Tom
9f60e57e-6c22-4dc2-8290-2224b3a181e6
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac
Trojak, Oliver, Joe
795f56e4-951b-48ec-95c3-8af4e0d8f3d5
Crane, Tom
9f60e57e-6c22-4dc2-8290-2224b3a181e6
Sapienza, Luca
a2e0cf6c-1f22-4a5a-87a2-ffab0e24e6ac

Trojak, Oliver, Joe, Crane, Tom and Sapienza, Luca (2017) Optical sensing with Anderson-localised light. Applied Physics Letters, 111 (14), [141103]. (doi:10.1063/1.4999936).

Record type: Article

Abstract

We show that fabrication imperfections in silicon nitride photonic crystal waveguides can be used as a resource to efficiently confine light in the Anderson-localised regime and add functionalities to photonic devices. Our results prove that disorder-induced localisation of light can be utilised to realise an alternative class of high-quality optical sensors operating at room temperature. We measure wavelength shifts of optical resonances as large as 15.2 nm, more than 100 times the spectral linewidth of 0.15 nm, for a refractive index change of about 0.38. By studying the temperature dependence of the optical properties of the system, we report wavelength shifts of up to about 2 nm and increases of more than a factor 2 in the quality factor of the cavity resonances, when going from room to cryogenic temperatures. Such a device can allow simultaneous sensing of both local contaminants and temperature variations, monitored by tens of optical resonances spontaneously appearing along a single photonic crystal waveguide. Our findings demonstrate the potential of Anderson-localised light in photonic crystals for scalable and efficient optical sensors operating in the visible and near-infrared range of wavelengths.

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sensing_Sept21_2017 - Accepted Manuscript
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More information

Accepted/In Press date: 22 September 2017
e-pub ahead of print date: 4 October 2017
Published date: October 2017

Identifiers

Local EPrints ID: 414396
URI: http://eprints.soton.ac.uk/id/eprint/414396
ISSN: 0003-6951
PURE UUID: 2e10ac1a-89ee-48bb-8119-0ae323c2ae6c
ORCID for Oliver, Joe Trojak: ORCID iD orcid.org/0000-0003-2296-6036

Catalogue record

Date deposited: 28 Sep 2017 16:31
Last modified: 21 Nov 2021 08:44

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Contributors

Author: Oliver, Joe Trojak ORCID iD
Author: Tom Crane
Author: Luca Sapienza

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