Whispering gallery modes in a single silica microparticle attached to an optical microfiber and their application for highly sensitive displacement sensing | Zendy

Ningyu Liu | Zendy; Lei Shi | Zendy; Song Zhu | Zendy; XinBiao Xu | Zendy; Shixing Yuan | Zendy; Xinliang Zhang | Zendy

Open Access

Whispering gallery modes in a single silica microparticle attached to an optical microfiber and their application for highly sensitive displacement sensing

Author(s) -

Ningyu Liu,

Lei Shi,

Song Zhu,

XinBiao Xu,

Shixing Yuan,

Xinliang 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.26.000195

Subject(s) - microfiber , whispering gallery wave , materials science , optics , whispering gallery , optical fiber , extinction ratio , displacement (psychology) , fiber optic sensor , interferometry , repeatability , silica fiber , free spectral range , optoelectronics , wavelength , fiber laser , physics , composite material , resonator , psychology , chemistry , chromatography , psychotherapist

A compact and relatively stable structure is experimentally demonstrated to excite whispering gallery modes (WGMs) in a single chemically fabricated silica microparticles with a diameter of around 10.6 μm attached to an optical microfiber. The resonance dip with an extinction ratio of 14 dB and Q factor of around 300 has been achieved. Based on the WGMs in this structure, an in-line fiber-optic displacement sensor is presented with a high sensitivity of 33 dB/mm and a measurement range of over 400 μm. The measurement resolution of this displacement sensor can reach to ~10 μm. The good reversibility and repeatability are also verified. This work offers a scheme to observe the WGMs in a single silica microparticles and demonstrates their application for in-line highly-sensitive displacement sensing.

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