PC fiber filled with nanomagnetic fluid becomes a magnetic-field sensor

A photonic-crystal (PC) fiber-based magnetic-field sensor created by scientists at the Defence Institute of Advanced Technology and Fergusson College (both in Pune, India) combines the flexibility of optical fiber with the sensing capabilities of optofluidics. The nanomagnetic fluid is prepared by combining an iron-salt solution with distilled water and ammonia, resulting in 20-nm-diameter suspended iron oxide particles. A polarization-maintaining PC fiber with two enlarged air holes is filled with the nanomagnetic fluid via syringe. The 23.5 cm fiber section is terminated on both ends with fiber polarizers (forming a birefringent interferometer), the input polarizer rotated to 45º, and a laser-swept interrogator with a broadband 1510–1590 nm source measures the interference between the two polarization modes at the output end.

The filling process fills only the two larger holes in the PC fiber, resulting in a reduced form birefringence intrinsic to the PC fiber, and the introduction of a magnetic-field-dependent birefringence. The wavelength spacing of the interference fringes after fiber filling is 37.979 nm. Upon application of a DC magnetic field, the fringe pattern shifts toward the blue. A magnetic-field sensitivity of 242 pm/mT was measured in one of the prototype devices. Contact Harneet Thakur at gahir08@gmail.com.

PC fiber filled with nanomagnetic fluid becomes a magnetic-field sensor

Most Popular Articles


Opportunities in the Mid-IR

The technology for exploiting the mid-IR is developing rapidly:  it includes quantum-cascade lasers and other sources, spectroscopic instruments of many...

Fiber Optic Sensors – Fundamentals, Principles and Applications

In this webcast, sponsored by Nufern, we focus on optical fiber sensing technology.  Fundamental concepts will be presented first, followed by the under...

Infinite Possibilities – Easily Combining Scanner and Servo Motion

High precision motion control applications such as laser micromachining, 2-photon polymerization, glass panel and film patterning, and additive manufacturing...

Solutions in Search of Problems: What Spectroscopy Can Do for You

Spectroscopy is so pervasive that most of us take it for granted. We use it for routine laboratory and test measurements without appreciating how those same ...

Technical Digests

HIGH-ENERGY LASER COATINGS: Eliminating laser damage proactively

High-power and high-energy thin-film antireflection coatings for laser optics require careful des...
Sponsored by

LIBS -- spectroscopy for remote identification of materials

Laser-induced-breakdown spectroscopy (LIBS) uses a pulsed laser to vaporize a small sample of a s...
Sponsored by

Laser Tools for Materials Processing

Laser materials processing requires not only the appropriate industrial laser system, but also a ...
Sponsored by

Click here to have your products listed in the Laser Focus World Buyers Guide.


UV/VIS/NIR Spectrometers, Light sources and Accessories

UV/VIS/NIR Spectrometers, Light sources and Accessories

Light Measurement Instrumentation

Gigahertz-Optik manufactures innovative light measurement instrumentation for specifica...

Custom Low Loss AR Coatings for High Power Lenses

For CW applications requiring very low absorption coatings, PPC utilizes in house Photo...


Stanford Photonics Inc

Provides leading-edge electronic imaging equipment, digital microscope cameras, and pho...

Photon Control Inc

Designs and builds precision measuring sensors, flow meters and other measurement tools...

Instrument Systems GmbH

Manufactures a line of measurement solutions to determine radiometric and photometric p...

Social Activity

Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS