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Plasmon-Interband Coupling in Nickel Nanoantennas

Zhaleh Pirzadeh (Institutionen för teknisk fysik, Bionanofotonik) ; Tavakol Pakizeh (Institutionen för teknisk fysik, Bionanofotonik) ; Vladimir D. Miljkovic (Institutionen för teknisk fysik, Bionanofotonik) ; Christoph Langhammer (Institutionen för teknisk fysik, Kemisk fysik) ; Alexandre Dmitriev (Institutionen för teknisk fysik, Bionanofotonik)
Acs Photonics (2330-4022). Vol. 1 (2014), 3, p. 158-162.
[Artikel, refereegranskad vetenskaplig]

Plasmonic excitations are usually attributed to the free electron response at visible frequencies in the classic plasmonic metals Au and Ag. However, the vast majority of metals exhibit spectrally localized interband transitions or broad interband transition backgrounds in the energy range of interest for nanoplasmonics. Nevertheless, the interaction of interband transitions with localized plasmons in optical nanoantennas has hitherto received relatively little attention, probably because interband transitions are regarded as highly unwanted due to their strong damping effect on the localized plasmons. However, with an increasing number of metals (beyond Au and Ag) being considered for nanoplasmonic applications such as hydrogen sensing (Pd), UV-SERS (Al), or magnetoplasmonics (Ni, Fe, Co), a deeper conceptual understanding of the interactions between a localized plasmon mode and an interband transition is very important. Here, as a generic example, we examine the interaction of a localized (in energy space) interband transition with spectrally tunable localized plasmonic excitations and unearth the underlying physics in a phenomenological approach for the case of Ni disk nanoantennas. We find that plasmon interband interactions can be understood in the classical picture of two coupled harmonic oscillators, exhibiting the typical energy anticrossing fingerprint of a coupled system approaching the strong-coupling regime.

Nyckelord: localized surface plasmon resonance, interband transition, nickel, nanoantenna, strong coupling



Denna post skapades 2014-07-03. Senast ändrad 2014-11-01.
CPL Pubid: 200114

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur