title: Magnesium as Novel Material for Active Plasmonics in the Visible Wavelength Range.
abstract: Investigating new materials plays an important role for advancing the field of nanoplasmonics. In this work, we fabricate nanodisks from magnesium and demonstrate tuning of their plasmon resonance throughout the whole visible wavelength range by changing the disk diameter. Furthermore, we employ a catalytic palladium cap layer to transform the metallic Mg particles into dielectric MgH2 particles when exposed to hydrogen gas. We prove that this transition can be reversed in the presence of oxygen. This yields plasmonic nanostructures with an extinction spectrum that can be repeatedly switched on or off or kept at any intermediate state, offering new perspectives for active plasmonic metamaterials.
authors: Fourth Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors: Florian
authors: F
authors: Sterl
authors: Fourth Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors: Nikolai
authors: N
authors: Strohfeldt
authors: Fourth Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors: Ramon
authors: R
authors: Walter
authors: Faculty of Sciences, Division of Physics and Astronomy, VU University , De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
authors: Ronald
authors: R
authors: Griessen
authors: Fourth Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors: Andreas
authors: A
authors: Tittl
authors: Fourth Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors: Harald
authors: H
authors: Giessen
keywords: Magnesium; active plasmonics; chemical reaction sensing; hydrogen loading; nanochemistry; nanofabrication; nanooptics