Optical fiber milled by focused ion beam and its application for Fabry-Pérot refractive index sensor

Wu Yuan, Fei Wang, Alexey Savenko, Dirch Hjorth Petersen, Ole Bang

Research output: Contribution to journalArticlepeer-review

Abstract

We introduce a highly compact fiber-optic Fabry-Pérot refractive index sensor integrated with a fluid channel that is fabricated directly near the tip of a 32 μm in diameter single-mode fiber taper. The focused ion beam technique is used to efficiently mill the microcavity from the fiber side and finely polish the end facets of the cavity with a high spatial resolution. It is found that a fringe visibility of over 15 dB can be achieved and that the sensor has a sensitivity of ∼1731 nmRIU (refractive index units) and a detection limit of ∼5.78 × 10-6 RIU. This miniature integrated all-in-fiber optofludic sensor may find use in minimal-invasive biomedical applications.

Original languageEnglish (US)
Article number076103
JournalReview of Scientific Instruments
Volume82
Issue number7
DOIs
StatePublished - Jul 2011

ASJC Scopus subject areas

  • Instrumentation

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