High sensitivity evanescent field refractometer based on modal interference in micro-capillary wall

Wei Peng, Yun Liu, Xinpu Zhang, Fang Cheng, Ming Han

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present a novel fiber-optic refractive index (RI) sensor based on a short piece of fused-silica micro-capillary (FSC) spliced between single mode fibers (SMFs). The sensing element is the tubing wall of the FSC where multiple modes excited from the lead-in SMF interfere to form fringes that are collected by the lead-out SMF. Two types of sensors with symmetric and asymmetric structures are fabricated and tested. A single lead-in SMF is used in the symmetric structure, whereas two lead-in SMFs are used in the asymmetric structure. Experimental results show that both types of sensors have high RI sensitivities, the symmetric structure sensor has a quadrature response with a higher sensitivity in the tested RI range from 1.33 to 1.37, and the asymmetric structure has a linear RI response with a sensitivity of 580.41 nm/RIU in the same RI range. The RI sensing platform demonstrated here can be further developed as a miniaturized fiber optic biosensor for biological and biochemical analysis.

Original languageEnglish (US)
Article number6615930
Pages (from-to)430-435
Number of pages6
JournalIEEE Sensors Journal
Volume14
Issue number2
DOIs
StatePublished - Feb 1 2014

Fingerprint

Refractometers
Evanescent fields
refractometers
Single mode fibers
Refractive index
refractivity
interference
sensitivity
fibers
sensors
Sensors
Fused silica
Fiber optics
fiber optics
silicon dioxide
bioassay
Tubing
bioinstrumentation
Biosensors
quadratures

Keywords

  • Fiber optic sensor
  • Interference
  • Microcapillary
  • Refractive index

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

High sensitivity evanescent field refractometer based on modal interference in micro-capillary wall. / Peng, Wei; Liu, Yun; Zhang, Xinpu; Cheng, Fang; Han, Ming.

In: IEEE Sensors Journal, Vol. 14, No. 2, 6615930, 01.02.2014, p. 430-435.

Research output: Contribution to journalArticle

Peng, Wei ; Liu, Yun ; Zhang, Xinpu ; Cheng, Fang ; Han, Ming. / High sensitivity evanescent field refractometer based on modal interference in micro-capillary wall. In: IEEE Sensors Journal. 2014 ; Vol. 14, No. 2. pp. 430-435.
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