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Tuning the near-infrared absorption of aromatic amines on tapered fibers sculptured with gold nanoparticles

Tuning the near-infrared absorption of aromatic amines on tapered fibers sculptured with gold nanoparticles
Tuning the near-infrared absorption of aromatic amines on tapered fibers sculptured with gold nanoparticles

We discover an unexpected enhancement of the absorption of near-infrared light by aromatic amine overtones on photonic microfibers sculptured with gold nanoparticles. The adsorbed nanoparticles make the near-infrared spectroscopy of aromatic amines on microfibers feasible despite the small absorption cross-section of the molecular vibration overtones. We demonstrate that in the presence of gold nanomediators, the absorption of light by weak overtone transitions in N-methylaniline as a model analyte is dramatically enhanced. We attribute this effect to the increase of the mean trajectory of light in a microfiber due to its resonant scattering on metallic nanoparticles. The spectrally integrated transmittance scales with the concentration of nanoparticles to the power 1/6 - the phenomenon of diffusive propagation of light. Practical applications of the discovered effect will include the detection of aromatic amines for efficient treatment of metabolic disorders resulting from the amino acids deficiency, research in biomedicine, and a number of bedside applications.

diffusive propagation, light-matter interaction, Microfibers, N-methylaniline, nanoparticles, overtone spectroscopy, vibration spectroscopy
2330-4022
2200-2207
Karabchevsky, Alina
26a2c158-ef26-43be-8f10-b37e04baa017
Katiyi, Aviad
41a80d8c-255d-4476-8731-b722e70b260d
Bin Abdul Khudus, Muhammad Imran Mustafa
2fe6e286-f479-4cd9-b03f-9278547cfd1c
Kavokin, Alexey V.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Karabchevsky, Alina
26a2c158-ef26-43be-8f10-b37e04baa017
Katiyi, Aviad
41a80d8c-255d-4476-8731-b722e70b260d
Bin Abdul Khudus, Muhammad Imran Mustafa
2fe6e286-f479-4cd9-b03f-9278547cfd1c
Kavokin, Alexey V.
70ffda66-cfab-4365-b2db-c15e4fa1116b

Karabchevsky, Alina, Katiyi, Aviad, Bin Abdul Khudus, Muhammad Imran Mustafa and Kavokin, Alexey V. (2018) Tuning the near-infrared absorption of aromatic amines on tapered fibers sculptured with gold nanoparticles. ACS Photonics, 5 (6), 2200-2207. (doi:10.1021/acsphotonics.8b00025).

Record type: Article

Abstract

We discover an unexpected enhancement of the absorption of near-infrared light by aromatic amine overtones on photonic microfibers sculptured with gold nanoparticles. The adsorbed nanoparticles make the near-infrared spectroscopy of aromatic amines on microfibers feasible despite the small absorption cross-section of the molecular vibration overtones. We demonstrate that in the presence of gold nanomediators, the absorption of light by weak overtone transitions in N-methylaniline as a model analyte is dramatically enhanced. We attribute this effect to the increase of the mean trajectory of light in a microfiber due to its resonant scattering on metallic nanoparticles. The spectrally integrated transmittance scales with the concentration of nanoparticles to the power 1/6 - the phenomenon of diffusive propagation of light. Practical applications of the discovered effect will include the detection of aromatic amines for efficient treatment of metabolic disorders resulting from the amino acids deficiency, research in biomedicine, and a number of bedside applications.

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More information

e-pub ahead of print date: 29 March 2018
Published date: 20 June 2018
Keywords: diffusive propagation, light-matter interaction, Microfibers, N-methylaniline, nanoparticles, overtone spectroscopy, vibration spectroscopy

Identifiers

Local EPrints ID: 422281
URI: http://eprints.soton.ac.uk/id/eprint/422281
ISSN: 2330-4022
PURE UUID: 6d814bbe-cffe-4e24-b859-28ff3f4f8824

Catalogue record

Date deposited: 20 Jul 2018 16:30
Last modified: 09 Nov 2021 13:48

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Contributors

Author: Alina Karabchevsky
Author: Aviad Katiyi
Author: Muhammad Imran Mustafa Bin Abdul Khudus

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