Importance of substrates for the visibility of "dark" plasmonic modes

Importance of substrates for the visibility of "dark" plasmonic modes

Dark plasmonic modes have interesting properties, including longer lifetimes and narrower linewidths than their radiative counterpart, and little to no radiative losses. However, they have not been extensively studied yet due to their optical inaccessibility. In this work, we systematically investig...

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Veröffentlicht in:Optics express 2020-04, Vol.28 (9), p.13938-13948
Hauptverfasser: Fiedler, Saskia, Raza, Søren, Ai, Ruoqi, Wang, Jianfang, Busch, Kurt, Stenger, Nicolas, Mortensen, N Asger, Wolff, Christian
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container_end_page 13948
container_issue 9
container_start_page 13938
container_title Optics express
container_volume 28
creator Fiedler, Saskia
Raza, Søren
Ai, Ruoqi
Wang, Jianfang
Busch, Kurt
Stenger, Nicolas
Mortensen, N Asger
Wolff, Christian
description Dark plasmonic modes have interesting properties, including longer lifetimes and narrower linewidths than their radiative counterpart, and little to no radiative losses. However, they have not been extensively studied yet due to their optical inaccessibility. In this work, we systematically investigated the dark radial breathing modes (RBMs) in monocrystalline gold nanodisks, specifically their outcoupling behavior into the far-field by cathodoluminescence spectroscopy. Increasing the substrate thickness resulted in an up to 4-fold enhanced visibility. This is attributed to breaking the mirror symmetry by the high-index substrate, creating an effective dipole moment. Furthermore, the resonance energy of the dark RMBs can be easily tuned by varying the nanodisk diameter, making them promising candidates for nanophotonic applications.
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title Importance of substrates for the visibility of "dark" plasmonic modes
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