Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels

Research output: Contribution to journalArticle

268 Citations (Scopus)

Abstract

We report a simple optical sensing device capable of measuring the refractive index of liquids propagating in microfluidic channels. The sensor is based on a single-mode optical fiber that is tapered to submicrometer dimensions and immersed in a transparent curable soft polymer. A channel for liquid analyte is created in the immediate vicinity of the taper waist. Light propagating through the tapered section of the fiber extends into the channel, making the optical loss in the system sensitive to the refractive-index difference between the polymer and the liquid. The fabrication process and testing of the prototype sensing devices are described. The sensor can operate both as a highly responsive on-off device and in the continuous measurement mode, with an estimated accuracy of refractive-index measurement of ∼5×10-4.

Original languageEnglish (US)
Pages (from-to)1273-1275
Number of pages3
JournalOptics Letters
Volume30
Issue number11
StatePublished - Jun 1 2005

Fingerprint

optical fibers
refractivity
liquids
sensors
polymers
tapering
prototypes
fabrication
fibers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

@article{a3e7ceb19a8f43649b0341d4e292b0a6,
title = "Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels",
abstract = "We report a simple optical sensing device capable of measuring the refractive index of liquids propagating in microfluidic channels. The sensor is based on a single-mode optical fiber that is tapered to submicrometer dimensions and immersed in a transparent curable soft polymer. A channel for liquid analyte is created in the immediate vicinity of the taper waist. Light propagating through the tapered section of the fiber extends into the channel, making the optical loss in the system sensitive to the refractive-index difference between the polymer and the liquid. The fabrication process and testing of the prototype sensing devices are described. The sensor can operate both as a highly responsive on-off device and in the continuous measurement mode, with an estimated accuracy of refractive-index measurement of ∼5×10-4.",
author = "Polynkin, {Pavel G} and Alexander Polynkin and Peyghambarian, {Nasser N} and Masud Mansuripur",
year = "2005",
month = "6",
day = "1",
language = "English (US)",
volume = "30",
pages = "1273--1275",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "The Optical Society",
number = "11",

}

TY - JOUR

T1 - Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels

AU - Polynkin, Pavel G

AU - Polynkin, Alexander

AU - Peyghambarian, Nasser N

AU - Mansuripur, Masud

PY - 2005/6/1

Y1 - 2005/6/1

N2 - We report a simple optical sensing device capable of measuring the refractive index of liquids propagating in microfluidic channels. The sensor is based on a single-mode optical fiber that is tapered to submicrometer dimensions and immersed in a transparent curable soft polymer. A channel for liquid analyte is created in the immediate vicinity of the taper waist. Light propagating through the tapered section of the fiber extends into the channel, making the optical loss in the system sensitive to the refractive-index difference between the polymer and the liquid. The fabrication process and testing of the prototype sensing devices are described. The sensor can operate both as a highly responsive on-off device and in the continuous measurement mode, with an estimated accuracy of refractive-index measurement of ∼5×10-4.

AB - We report a simple optical sensing device capable of measuring the refractive index of liquids propagating in microfluidic channels. The sensor is based on a single-mode optical fiber that is tapered to submicrometer dimensions and immersed in a transparent curable soft polymer. A channel for liquid analyte is created in the immediate vicinity of the taper waist. Light propagating through the tapered section of the fiber extends into the channel, making the optical loss in the system sensitive to the refractive-index difference between the polymer and the liquid. The fabrication process and testing of the prototype sensing devices are described. The sensor can operate both as a highly responsive on-off device and in the continuous measurement mode, with an estimated accuracy of refractive-index measurement of ∼5×10-4.

UR - http://www.scopus.com/inward/record.url?scp=20444458252&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=20444458252&partnerID=8YFLogxK

M3 - Article

C2 - 15981504

AN - SCOPUS:20444458252

VL - 30

SP - 1273

EP - 1275

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 11

ER -