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Issue 34, 2016
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Slanted gold mushroom array: a switchable bi/tridirectional surface plasmon polariton splitter

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Abstract

Surface plasmon polaritons (SPPs) show great promise in providing an ultracompact platform for integrated photonic circuits. However, challenges remain in easily and efficiently coupling light into and subsequently routing SPPs. Here, we theoretically propose and experimentally demonstrate a switchable bi/tridirectional beam splitter which can simultaneously perform both tasks. The photonic device consists of a periodic array of slanted gold ‘mushrooms’ composed of angled dielectric pillars with gold caps extruding from a periodic array of perforations in a gold film. The unidirectional coupling results from the interference of the in-plane guided modes scattered by a pair of dislocated gold gratings, while the output channel is determined by the polarization of the incident beam. This device, in combination with dynamic polarization modulation techniques, has the potential to serve as a router or switch in plasmonic integrated circuits.

Graphical abstract: Slanted gold mushroom array: a switchable bi/tridirectional surface plasmon polariton splitter

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Article information


Submitted
29 Apr 2016
Accepted
03 Aug 2016
First published
03 Aug 2016

Nanoscale, 2016,8, 15505-15513
Article type
Communication

Slanted gold mushroom array: a switchable bi/tridirectional surface plasmon polariton splitter

Y. Shen, G. Fang, A. Cerjan, Z. Chi, S. Fan and C. Jin, Nanoscale, 2016, 8, 15505
DOI: 10.1039/C6NR03488H

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