Open AccessMeasuring the charge density of a tapered optical fiber using trapped microparticles
Author(s) -
Kazuhiko Kamitani,
Takuya Muranaka,
Hideaki Takashima,
Shinji Ito,
U. Tanaka,
Shigeki Takeuchi,
Shinji Urabe
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.004672
Subject(s) - materials science , optics , fiber , optical fiber , polystyrene , particle (ecology) , optical force , charge density , charge (physics) , optical tweezers , atomic physics , physics , polymer , composite material , oceanography , quantum mechanics , geology
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 2-1+3×10 -11 C/m.