Design of large scale plasmonic nanoslit arrays for arbitrary mode conversion and demultiplexing

Pierre Wahl; Takuo Tanemura; Nathalie Vermeulen; Jürgen Van Erps; David A. B. Miller; Hugo Thienpont

doi:10.1117/12.2052104

2 May 2014 Design of large scale plasmonic nanoslit arrays for arbitrary mode conversion and demultiplexing

Pierre Wahl, Takuo Tanemura, Nathalie Vermeulen, Jürgen Van Erps, David A. B. Miller, Hugo Thienpont

Proceedings Volume 9126, Nanophotonics V; 91261F (2014) https://doi.org/10.1117/12.2052104
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

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.

Citation Download Citation

Pierre Wahl, Takuo Tanemura, Nathalie Vermeulen, Jürgen Van Erps, David A. B. Miller, and Hugo Thienpont "Design of large scale plasmonic nanoslit arrays for arbitrary mode conversion and demultiplexing", Proc. SPIE 9126, Nanophotonics V, 91261F (2 May 2014); https://doi.org/10.1117/12.2052104

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KEYWORDS

Surface plasmons

Electroluminescent displays

Metals

Finite-difference time-domain method

Interfaces

3D modeling

Optimization (mathematics)

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