Novel multiphase D-shaped fiber optic sensor realized by femtosecond laser machining

Chien Hsing Chen, Tzu Ting Weng, Jian Neng Wang, Chung-Wei Cheng, Jaw Luen Tang*, Lai Kwan Chau, Wei Te Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A novel class of multiphase D-shaped optical fiber suitable for refractive index measurements is presented. The multiphase D-shaped optical fiber was constructed by forming six D-sections in a multimode optical fiber at localized regions with femtosecond laser pulses. Each D-shaped zone covered a sensor volume of 100 μm depth, 245 μm width, and 1 mm length. Each bottom plane of a D-shaped zone forms an angle of 60 degree with the bottom plane of an adjacent D-shaped zone. The multiphase D-shaped optical fiber as a highly sensitive refractive-index sensor to detect changes in the surrounding refractive index was studied. Results show that a refractive index resolution of 2.82 × 10-4 RIU was achieved for sucrose solutions with refractive indices in the range of 1.333 to 1.403, suggesting that the multiphase D-shaped fibers are attractive for chemical, biological, and biochemical sensing.

Original languageEnglish
Pages (from-to)81-86
Number of pages6
JournalJournal of Laser Micro Nanoengineering
Issue number1
StatePublished - 1 Mar 2011


  • Femtosecond laser
  • Multiphase D-shaped fiber
  • Sensor

Fingerprint Dive into the research topics of 'Novel multiphase D-shaped fiber optic sensor realized by femtosecond laser machining'. Together they form a unique fingerprint.

Cite this