Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas

Light, Science & Applications
Germann HergertPeter Schaaf

Abstract

We report long-lived, highly spatially localized plasmon states on the surface of nanoporous gold nanoparticles-nanosponges-with high excitation efficiency. It is well known that disorder on the nanometer scale, particularly in two-dimensional systems, can lead to plasmon localization and large field enhancements, which can, in turn, be used to enhance nonlinear optical effects and to study and exploit quantum optical processes. Here, we introduce promising, three-dimensional model systems for light capture and plasmon localization as gold nanosponges that are formed by the dewetting of gold/silver bilayers and dealloying. We study light-induced electron emission from single nanosponges, a nonlinear process with exponents of n≈5...7, using ultrashort laser pulse excitation to achieve femtosecond time resolution. The long-lived electron emission process proves, in combination with optical extinction measurements and finite-difference time-domain calculations, the existence of localized modes with lifetimes of more than 20 fs. These electrons couple efficiently to the dipole antenna mode of each individual nanosponge, which in turn couples to the far-field. Thus, individual gold nanosponges are cheap and robust disordered nanoant...Continue Reading

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Citations

Dec 10, 2020·Nanomaterials·Sergey SyubaevAleksandr Kuchmizhak
Jan 18, 2018·Nano Letters·Cynthia VidalThomas A Klar

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Methods Mentioned

BETA
surface plasmon
scanning electron microscopy
light scattering
coherent plasmon scattering

Software Mentioned

Meep

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