Abstract
An approximate pattern of calculation of the field behavior in waveguides of variable radius is proposed. It is based on the assumption of a slow dependence of the radius on the longitudinal coordinate and is reduced to the solution of an ordinary differential equation. The dependences of the waveguide transmission on the frequency of radiation, entrance and exit radii, as well as the rate of radius variation along the axis are studied. The analysis is carried out within the range of parameters typical for optical fibers used in optical near‐field microscopy. It is shown that the increase in the rate of radius variation with the longitudinal coordinate will cause the transmission coefficient of the tapered waveguide to increase.
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Kuznetsova, T.I., Lebedev, V.S. Light Penetration through a Tapered Waveguide. J Russ Laser Res 22, 123–138 (2001). https://doi.org/10.1023/A:1011355905164
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DOI: https://doi.org/10.1023/A:1011355905164