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Optical nanofiber coupler sensors operating in the cut-off wavelength region

Optical nanofiber coupler sensors operating in the cut-off wavelength region
Optical nanofiber coupler sensors operating in the cut-off wavelength region
An ultrasensitive optical nanofiber coupler (NFC) for thermal and refractive index sensing with nanoscale dimension is proposed and experimentally demonstrated. The NFC operating near the cut-off region of the higher order modes is fabricated by fusing and pulling two standard telecom fibers using the modified flame brushing technique. Due to the sub-micron diameter, the NFC exhibits an anomalous behavior in close proximity to the odd supermode cut-off wavelength, where the high extinction ratio spectral oscillations exhibit very slow oscillations. The sensitivity of this region is exploited for thermal sensing over a broad range of temperatures (84 °C–661 °C). An average temperature sensitivity of 55 pm/°C and a maximum sensitivity of 60 pm/°C at the highest temperature were demonstrated. Owing to its small size, the thermal sensor exhibits a fast response time of ~7.2 ms. The sensor capability for detecting refractive index changes is also examined with different ethanol concentrations. A record sensitivity of 4.80×105 nm/RIU was achieved, which is the highest reported value in all optical fiber refractometers.
nanofiber coupler, temperature sensor, refractive index sensor, broad temperature, large dynamic range
1530-437X
2782-2787
Talataisong, Wanvisa
e1fa515e-5650-431b-a354-24683c83d714
Ismaeel, Rand
c1fb0984-a4c0-484a-8aef-625d48a62086
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Talataisong, Wanvisa
e1fa515e-5650-431b-a354-24683c83d714
Ismaeel, Rand
c1fb0984-a4c0-484a-8aef-625d48a62086
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8

Talataisong, Wanvisa, Ismaeel, Rand, Lee, Timothy, Beresna, Martynas and Brambilla, Gilberto (2018) Optical nanofiber coupler sensors operating in the cut-off wavelength region. IEEE Sensors Journal, 18 (7), 2782-2787. (doi:10.1109/JSEN.2018.2802724).

Record type: Article

Abstract

An ultrasensitive optical nanofiber coupler (NFC) for thermal and refractive index sensing with nanoscale dimension is proposed and experimentally demonstrated. The NFC operating near the cut-off region of the higher order modes is fabricated by fusing and pulling two standard telecom fibers using the modified flame brushing technique. Due to the sub-micron diameter, the NFC exhibits an anomalous behavior in close proximity to the odd supermode cut-off wavelength, where the high extinction ratio spectral oscillations exhibit very slow oscillations. The sensitivity of this region is exploited for thermal sensing over a broad range of temperatures (84 °C–661 °C). An average temperature sensitivity of 55 pm/°C and a maximum sensitivity of 60 pm/°C at the highest temperature were demonstrated. Owing to its small size, the thermal sensor exhibits a fast response time of ~7.2 ms. The sensor capability for detecting refractive index changes is also examined with different ethanol concentrations. A record sensitivity of 4.80×105 nm/RIU was achieved, which is the highest reported value in all optical fiber refractometers.

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NFC_sensors_operating_near_cut_off_Wanvisa_Talataisong - Accepted Manuscript
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Accepted/In Press date: 1 February 2018
e-pub ahead of print date: 12 February 2018
Published date: 1 April 2018
Keywords: nanofiber coupler, temperature sensor, refractive index sensor, broad temperature, large dynamic range

Identifiers

Local EPrints ID: 419268
URI: http://eprints.soton.ac.uk/id/eprint/419268
ISSN: 1530-437X
PURE UUID: 1f1c56c2-dfcf-420d-912e-acc24061ff9e

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Date deposited: 09 Apr 2018 16:30
Last modified: 16 Dec 2019 18:22

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