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Oxide mediated spectral shifting in aluminum resonant optical antennas

Schwab, P.M.; Moosmann, C.; Dopf, K.; Eisler, H.-J.

As a key feature among metals showing good plasmonic behavior, aluminum extends the spectrum of achievable plasmon resonances of optical antennas into the deep ultraviolet. Due to degradation, a native oxide layer gives rise to a metal-core/oxide-shell nanoparticle and influences the spectral resonance peak position. In this work, we examine the role of the underlying processes by applying numerical nanoantenna models that are experimentally not feasible. Finite-difference time-domain simulations are carried out for a large variety of elongated single-arm and two-arm gap nanoantennas. In a detailed analysis, which takes into account the varying surface-to-volume ratio, we show that the overall spectral shift toward longer wavelengths is mainly driven by the higher index surrounding material rather than by the decrease of the initial aluminum volume. In addition, we demonstrate experimentally that this shifting can be minimized by an all-inert fabrication and subsequent proof-of-concept encapsulation. © 2015 Optical Society of America.

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DOI: 10.5445/IR/1000050814
DOI: 10.1364/OE.23.026533
Zitationen: 8
Web of Science
Zitationen: 7
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000050814
HGF-Programm 43.22.03 (POF III, LK 01) Printed Materials and Systems
Erschienen in Optics Express
Verlag The Optical Society of America (OSA)
Band 23
Heft 20
Seiten 26533-26543
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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