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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 30,
  • Issue 13,
  • pp. 2134-2142
  • (2012)

Confined and Propagating Modes of Microstructured Optical Fibers With Three-Dimensional Geometry Variation

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Abstract

Microstructured optical fiber inline cavity designs are presented with lengths less than 60 µm, mode volumes less than 3 (λ<sub>0</sub>/<i>n</i>)<sup>3</sup>, and <i>Q</i> factors exceeding 3000. The device geometries are consistent with the fiber postprocessing capabilities of focused ion beam or femtosecond micromachining. The devices are based on introducing a longitudinally periodic hole array into a microstructured optical fiber. The micromachined fiber dispersion is calculated using the 3-D finite-different time-domain method. Bandgap frequencies, confined cavity mode frequencies, and quality factors are presented. Application of the device as a fast-response-time refractometer is explored, and sensitivities of 150 nm per refractive index unit are predicted.

© 2012 IEEE

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