Numerical Aperture of Single-Mode Photonic Crystal Fibers

Details Numerical Aperture of Single-Mode Photonic Crystal Fibers Numerical Aperture of Single-Mode Photonic Crystal Fibers

2002-02-28

arxiv.org/abs/physics/0202073v2

IEEE Photonics Technology Letters 14, 1094 (2002)

Physics

Optics

3 pages including 6 figures. Webpage at http://www.crystal-fibre.com

Scientific paper

10.1109/LPT.2002.1021980

We consider the problem of radiation into free space from the end-facet of a single-mode photonic crystal fiber (PCF). We calculate the numerical aperture NA=sin theta from the half-divergence angle theta ~ tan^{-1}(lambda/pi w) with pi w^2 being the effective area of the mode in the PCF. For the fiber first presented by Knight et al. we find a numerical aperture NA ~ 0.07 which compares to standard fiber technology. We also study the effect of different hole sizes and demonstrate that the PCF technology provides a large freedom for NA-engineering. Comparing to experiments we find good agreement.

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