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Proceedings Paper

Design of large scale plasmonic nanoslit arrays for arbitrary mode conversion and demultiplexing
Author(s): Pierre Wahl; Takuo Tanemura; Nathalie Vermeulen; Jürgen Van Erps; David A. B. Miller; Hugo Thienpont
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Paper Abstract

We present an iterative design method for the coupling and the mode conversion of arbitrary modes to focused surface plasmons using a large array of aperiodically randomly located slits in a thin metal lm. As the distance between the slits is small and the number of slits is large, significant mutual coupling occurs between the slits which makes an accurate computation of the field scattered by the slits difficult. We use an accurate modal source radiator model to efficiently compute the fields in a significantly shorter time compared with three-dimensional (3D) full-field rigorous simulations, so that iterative optimization is efficiently achieved. Since our model accounts for mutual coupling between the slits, the scattering by the slits of both the source wave and the focused surface plasmon can be incorporated in the optimization scheme. We apply this method to the design of various types of couplers for arbitrary fiber modes and a mode demultiplexer that focuses three orthogonal fiber modes to three different foci. Finally, we validate our design results using fully vectorial 3D nite-difference time-domain (FDTD) simulations.

Paper Details

Date Published: 2 May 2014
PDF: 14 pages
Proc. SPIE 9126, Nanophotonics V, 91261F (2 May 2014); doi: 10.1117/12.2052104
Show Author Affiliations
Pierre Wahl, Vrije Univ. Brussel (Belgium)
Stanford Univ. (United States)
Takuo Tanemura, The Univ. of Tokyo (Japan)
Nathalie Vermeulen, Vrije Univ. Brussel (Belgium)
Jürgen Van Erps, Vrije Univ. Brussel (Belgium)
David A. B. Miller, Stanford Univ. (United States)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 9126:
Nanophotonics V
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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