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

Published

Author(s)

Brian S. Dennis, David Czaplewski, Michael Haftel, Daniel Lopez, Girsh Blumberg, Vladimir Aksyuk

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 directing in two-dimensions. This is accomplished using a high numerical-aperture metal-dielectric-metal lens incorporated into a planar-waveguide device. Detailed fabrication via metal sputtering, oxide deposition, electron- and focused-ion- beam lithography, and argon ion-milling is reported. Diffraction-limited focusing is optically characterized by microscopically sampling out-coupled light. The measured focal distance and 0.9 um full-width-half-max spot size agree well with the calculated lens performance. The surface plasmon propagation length is measured by sampling light from multiple out-coupler slits.
Citation
Optics Express
Volume
23
Issue
17

Keywords

Electro-optical devices, Integrated optics devices, Optical microelectromechanical devices, Plasmonics, Nanophotonics and photonic crystals

Citation

Dennis, B. , Czaplewski, D. , Haftel, M. , Lopez, D. , Blumberg, G. and Aksyuk, V. (2015), Diffraction limited focusing and directing of gap plasmons by a metal-dielectric-metal lens, Optics Express, [online], https://doi.org/10.1364/OE.23.021899, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918737 (Accessed February 21, 2024)
Created August 23, 2015, Updated October 12, 2021