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Proceedings Paper

A robust full-vectorial mode solver for metalized fiber taper
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Paper Abstract

Conically tapered fibers with dielectric or metalized waists or tips of a sub-wavelength diameter have the potential of a range of applications, from optical probes for near-field detection to (bio)chemical sensing in extremely small volumes of analytes. For successful design, a robust modeling tool is a prerequisite. In such structures, strongly lossy modes with complex propagation constants with large imaginary parts may be excited. In this paper, a reliable eigenmode solver for cylindrical structures containing metal layers is described. An analytical function whose roots correspond to propagation constants of waveguide eigenmodes is formulated. Its roots are found with a help of Argument Principal Method. Due to the analyticity limitation, the waveguide structure has to be of a finite diameter with either electrically or magnetically conductive walls. The approach is implemented within the well-known modeling tool CAMFR. The feasibility of the method is demonstrated using the example of light propagation in the metalized fiber taper dipped in the surrounding medium.

Paper Details

Date Published: 18 November 2008
PDF: 8 pages
Proc. SPIE 7138, Photonics, Devices, and Systems IV, 713812 (18 November 2008); doi: 10.1117/12.818006
Show Author Affiliations
Petr Tobiska, Institute of Photonics and Electronics (Czech Republic)
Jirí Ctyroký, Institute of Photonics and Electronics (Czech Republic)

Published in SPIE Proceedings Vol. 7138:
Photonics, Devices, and Systems IV
Pavel Tománek; Dagmar Senderáková; Miroslav Hrabovský, Editor(s)

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