Measuring the charge density of a tapered optical fiber using trapped microparticles

Kazuhiko Kamitani, Takuya Muranaka, Hideaki Takashima, Masazumi Fujiwara, Utako Tanaka, Shigeki Takeuchi, Shinji Urabe

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report the measurements of charge density of tapered optical fibers using charged particles confined in a linear Paul trap at ambient pressure. A tapered optical fiber is placed across the trap axis at a right angle, and polystyrene microparticles are trapped along the trap axis. The distance between the equilibrium position of a positively charged particle and the tapered fiber is used to estimate the amount of charge per unit length of the fiber without knowing the amount of charge of the trapped particle. The charge per unit length of a tapered fiber with a diameter of 1.6 μm was measured to be 2+3-1 × 10-11 C/m.

Original languageEnglish
Pages (from-to)4672-4679
Number of pages8
JournalOptics Express
Issue number5
Publication statusPublished - Mar 7 2016
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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