Ultrathin graphene diaphragm-based extrinsic Fabry-Perot interferometer for ultra-wideband fiber optic acoustic sensing | Zendy

Wenjun Ni | Zendy; Ping Lü | Zendy; Xin Fu | Zendy; Wei Zhang | Zendy; Perry Ping Shum | Zendy; Handong Sun | Zendy; Chunyong Yang | Zendy; Deming Liu | Zendy; Jiangshan Zhang | Zendy

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Ultrathin graphene diaphragm-based extrinsic Fabry-Perot interferometer for ultra-wideband fiber optic acoustic sensing

Author(s) -

Wenjun Ni,

Ping Lü,

Xin Fu,

Wei Zhang,

Perry Ping Shum,

Handong Sun,

Chunyong Yang,

Deming Liu,

Jiangshan Zhang

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.020758

Subject(s) - materials science , optics , diaphragm (acoustics) , interferometry , fabry–pérot interferometer , wideband , optical fiber , fiber optic sensor , graphene , optoelectronics , acoustics , wavelength , vibration , nanotechnology , physics

An ultra-wideband fiber optic acoustic sensor based on graphene diaphragm with a thickness of 10nm has been proposed and experimentally demonstrated. The two reflectors of the extrinsic Fabry-Perot interferometer is consist of fiber endface and graphene diaphragm, and the cavity is like a horn-shape. The radius of the effective area of the ultrathin graphene diaphragm is 1mm. Attributed to the strong van der Waals force between the diaphragm and the ceramic ferrule, the sensor head can be applied not only in the air but also underwater. Experimental results illustrate that ultra-wideband frequency response is from 5Hz to 0.8MHz, covering the range from infrasound to ultrasound. The noise-limited minimum detectable pressure level of 0.77Pa/Hz 1/2 @5Hz and 33.97μPa/Hz 1/2 @10kHz can be achieved, and the applied sound pressure is 114dB and 65.8dB, respectively. The fiber optic acoustic sensor may have a great potential in seismic wave monitoring, photoacoustic spectroscopy and photoacoustic imaging application due to its compact structure, simple manufacturing, and low cost.

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