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Tailoring of surface plasmon resonances in TiN/(Al0.72Sc0.28)N multilayers by dielectric layer thickness variation
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2837-3656
KIT, Germany; TUD, Germany.
Virginia Tech, VA 24061 USA; Virginia Tech, VA 24061 USA.
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2018 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 6, p. 4001-4009Article in journal (Refereed) Published
Abstract [en]

Alternative designs of plasmonic metamaterials for applications in solar energy-harvesting devices are necessary due to pure noble metal-based nanostructures incompatibility with CMOS technology, limited thermal and chemical stability, and high losses in the visible spectrum. In the present study, we demonstrate the design of a material based on a multilayer architecture with systematically varying dielectric interlayer thicknesses that result in a continuous shift of surface plasmon energy. Plasmon resonance characteristics of metal/semiconductor TiN/(Al,Sc)N multilayer thin films with constant TiN and increasing (Al,Sc)N interlayer thicknesses were analyzed using aberration-corrected and monochromated scanning transmission electron microscopy-based electron energy loss spectroscopy (EELS). EEL spectrum images and line scans were systematically taken across layer interfaces and compared to spectra from the centers of the respective adjacent TiN layer. While a constant value for the TiN bulk plasmon resonance of about 2.50 eV was found, the surface plasmon resonance energy was detected to continuously decrease with increasing (Al,Sc)N interlayer thickness until 2.16 eV is reached. This effect can be understood to be the result of resonant coupling between the TiN bulk and surface plasmons across the dielectric interlayers at very low (Al,Sc)N thicknesses. That energy interval between bulk and decreasing surface plasmon resonances corresponds to wavelengths in the visible spectrum. This shows the potential of tailoring the materials plasmonic response by controlling the (Al,Sc)N interlayer thickness, making TiN-based multilayers good prospects for plasmonic metamaterials in energy devices.

Place, publisher, year, edition, pages
SPRINGER , 2018. Vol. 53, no 6, p. 4001-4009
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-144129DOI: 10.1007/s10853-017-1837-4ISI: 000418294200006OAI: oai:DiVA.org:liu-144129DiVA, id: diva2:1172549
Note

Funding Agencies|Swedish Research Council [2011-6505, 2013-4018]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 2009-00971]; National Science Foundation; U.S. Department of Energy [CBET-1048616]; Swedish Foundation for International Cooperation in Research and Higher Education (STINT); Karlsruhe Nano Micro Facility [2015-015-010151]

Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-01-31

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