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.
- State Univ. of New York, Piscataway, NJ (United States). Dept. of Physics and Astronomy.
- Argonne National Lab., Argonne, IL (United States). Center for Nanoscale Materials.
- Univ. of Colorado, Colorado Springs, CO (United States). Dept. of Physics.
- 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: