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

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.021899· OSTI ID:1215674
 [1];  [2];  [3];  [2];  [1];  [4]
  1. State Univ. of New York, Piscataway, NJ (United States). Dept. of Physics and Astronomy.
  2. Argonne National Lab., Argonne, IL (United States). Center for Nanoscale Materials.
  3. Univ. of Colorado, Colorado Springs, CO (United States). Dept. of Physics.
  4. National Institute of Standards, Gaithersburg, MD (United States). Center for Nanoscale Science and Technology.

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1215674
Alternate ID(s):
OSTI ID: 1391931
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 17 Vol. 23; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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