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

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.
 [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.
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FA9550-09-1-0698; 70NANB14H030; 70NANB14H259; DMR-1104884
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 23; Journal Issue: 17; Journal ID: ISSN 1094-4087
Optical Society of America (OSA)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
42 ENGINEERING; electro-optical devices; integrated optics devices; optical microelectromechanical devices; plasmonics; nanophotonics and photonic crystals
OSTI Identifier: