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

作者：Dennis Brian S; Czaplewski David A; Haftel Michael I; Lopez Daniel; Blumberg Girsh; Aksyuk Vladimir^*

来源：Optics Express, 2015, 23(17): 21899-21908.

DOI：10.1364/OE.23.021899

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.

• 出版日期2015-8-24
• 单位rutgers