18 November 2008 A robust full-vectorial mode solver for metalized fiber taper
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Proceedings Volume 7138, Photonics, Devices, and Systems IV; 713812 (2008) https://doi.org/10.1117/12.818006
Event: Photonics, Devices, and Systems IV, 2008, Prague, Czech Republic
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.
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Petr Tobiska, Petr Tobiska, Jirí Ctyroký, Jirí Ctyroký, } "A robust full-vectorial mode solver for metalized fiber taper", Proc. SPIE 7138, Photonics, Devices, and Systems IV, 713812 (18 November 2008); doi: 10.1117/12.818006; https://doi.org/10.1117/12.818006
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