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arXiv · 1507.08691

Diffraction limited focusing and routing of gap plasmons by a metal-dielectric-metal lens

Brian S. Dennis·David A. Czaplewski·Michael I. Haftel·Daniel Lopez·Girsh Blumberg·Vladimir Aksyuk
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Abstract

Passive optical elements can play key roles in photonic applications such as plasmonic integrated circuits. Here we experimentally demonstrate passive gap-plasmon focusing and routing in two-dimensions. This is accomplished using a high numerical-aperture metal-dielectric-metal lens incorporated into a planar-waveguide device. Fabrication via metal sputtering, oxide deposition, electron- and focused-ion- beam lithography, and argon ion-milling is reported on in detail. Diffraction-limited focusing is optically characterized by sampling out-coupled light with a microscope. The measured focal distance and full-width-half-maximum spot size agree well with the calculated lens performance. The surface plasmon polariton propagation length is measured by sampling light from multiple out-coupler slits.

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Brian S. Dennis, David A. Czaplewski, Michael I. Haftel, Daniel Lopez, Girsh Blumberg, Vladimir Aksyuk. 2015-07-30. Diffraction limited focusing and routing of gap plasmons by a metal-dielectric-metal lens. https://doi.org/10.1364/oe.23.021899

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