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Ultra-high-sensitivity refractive index sensor based on dual-microfiber coupler structure with the Vernier effect

Ultra-high-sensitivity refractive index sensor based on dual-microfiber coupler structure with the Vernier effect
Ultra-high-sensitivity refractive index sensor based on dual-microfiber coupler structure with the Vernier effect
We demonstrate a novel, to the best of our knowledge, refractive index (RI) sensor based on the Vernier effect in dual-microfiber coupler (MFC) structures. The sensor sensitivity was studied both theoretically and experimentally. The numerical results show that by tracing the wavelength shifts of the envelope formed by the Vernier effect, the sensitivity can be improved by several times compared to that obtained for normal coupler-based sensors. In this Letter, two MFCs with a width and free spectral range (FSR) of ~3.5µm and 6 nm, respectively, were fabricated. Based on the sensitivity of 5820 nm/RIU for a single coupler, we experimentally achieved an ultra-high sensitivity of 126,540 nm/RIU using dual MFCs by the Vernier effect in the RI range of 1.3350 to 1.3455, which shows good agreement with numerical simulations. The proposed all-fiber RI sensor has the advantages of high sensitivity and low cost and can find applications in chemical and biological detection as well as electronic/magnetic field measurement.
0146-9592
1268-1271
Jiang, Yuxuan
1cdd584c-b8de-4989-b4f3-1c38046290cd
Yi, Yating
5fd4439a-1dc9-477a-8a2f-716ac61751ca
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Jiang, Yuxuan
1cdd584c-b8de-4989-b4f3-1c38046290cd
Yi, Yating
5fd4439a-1dc9-477a-8a2f-716ac61751ca
Brambilla, G.
815d9712-62c7-47d1-8860-9451a363a6c8
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb

Jiang, Yuxuan, Yi, Yating, Brambilla, G. and Wang, Pengfei (2020) Ultra-high-sensitivity refractive index sensor based on dual-microfiber coupler structure with the Vernier effect. Optics Letters, 45 (5), 1268-1271. (doi:10.1364/OL.385345).

Record type: Article

Abstract

We demonstrate a novel, to the best of our knowledge, refractive index (RI) sensor based on the Vernier effect in dual-microfiber coupler (MFC) structures. The sensor sensitivity was studied both theoretically and experimentally. The numerical results show that by tracing the wavelength shifts of the envelope formed by the Vernier effect, the sensitivity can be improved by several times compared to that obtained for normal coupler-based sensors. In this Letter, two MFCs with a width and free spectral range (FSR) of ~3.5µm and 6 nm, respectively, were fabricated. Based on the sensitivity of 5820 nm/RIU for a single coupler, we experimentally achieved an ultra-high sensitivity of 126,540 nm/RIU using dual MFCs by the Vernier effect in the RI range of 1.3350 to 1.3455, which shows good agreement with numerical simulations. The proposed all-fiber RI sensor has the advantages of high sensitivity and low cost and can find applications in chemical and biological detection as well as electronic/magnetic field measurement.

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More information

Accepted/In Press date: 31 January 2020
e-pub ahead of print date: 31 January 2020
Published date: 1 March 2020

Identifiers

Local EPrints ID: 442052
URI: http://eprints.soton.ac.uk/id/eprint/442052
ISSN: 0146-9592
PURE UUID: 36a72eff-9d7f-4716-b527-471aeca090b0
ORCID for G. Brambilla: ORCID iD orcid.org/0000-0002-5730-0499

Catalogue record

Date deposited: 06 Jul 2020 16:31
Last modified: 28 Apr 2022 01:48

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Contributors

Author: Yuxuan Jiang
Author: Yating Yi
Author: G. Brambilla ORCID iD
Author: Pengfei Wang

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