Detail publikace

Singular and Nonsingular Transitions in the Infrared Plasmons of Nearly Touching Nanocube Dimers

WU, Y. KONEČNÁ, A. CHO, S. MILLIRON, D. HACHTEL, J. DE ABAJO, F.

Originální název

Singular and Nonsingular Transitions in the Infrared Plasmons of Nearly Touching Nanocube Dimers

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Narrow gaps between plasmon-supporting materials can confine infrared electromagnetic energy at the nanoscale, thus enabling applications in areas such as optical sensing. However, in nanoparticle dimers, the nature of the transition between touching (zero gap) and nearly nontouching (nonzero gap less than or similar to 15 nm) regimes is still a subject of debate. Here, we observe both singular and nonsingular transitions in infrared plasmons confined to dimers of fluorine-doped indium oxide nanocubes when moving from touching to nontouching configurations depending on the dimensionality of the contact region. Through spatially resolved electron energy-loss spectroscopy, we find a continuous spectral evolution of the lowest-order plasmon mode across the transition for finite touching areas, in excellent agreement with the simulations. This behavior challenges the widely accepted idea that a singular transition always emerges in the near-touching regime of plasmonic particle dimers. The apparent contradiction is resolved by theoretically examining different types of gap morphologies, revealing that the presence of a finite touching area renders the transition nonsingular, while one-dimensional and point-like contacts produce a singular behavior in which the lowest-order dipolar mode in the touching configuration, characterized by a net induced charge in each of the particles, becomes unphysical as soon as they are separated. Our results provide valuable insights into the nature of dimer plasmons in highly doped semiconductors.

Klíčová slova

infrared plasmons; nanodimers; fluorine-dopedindium oxide; electron energy-loss spectroscopy (EELS); confined optical modes

Autoři

WU, Y.; KONEČNÁ, A.; CHO, S.; MILLIRON, D.; HACHTEL, J.; DE ABAJO, F.

Vydáno

28. 5. 2024

Nakladatel

AMER CHEMICAL SOC

Místo

WASHINGTON

ISSN

1936-0851

Periodikum

ACS Nano

Ročník

18

Číslo

23

Stát

Spojené státy americké

Strany od

15130

Strany do

15138

Strany počet

9

URL

https://pubs.acs.org/doi/10.1021/acsnano.4c02644

BibTex

@article{BUT189999,
  author="Yina {Wu} and Andrea {Konečná} and Shin Hum {Cho} and Delia J. {Milliron} and Jordan A. {Hachtel} and F. Javier García {de Abajo}",
  title="Singular and Nonsingular Transitions in the Infrared Plasmons of Nearly Touching Nanocube Dimers",
  journal="ACS Nano",
  year="2024",
  volume="18",
  number="23",
  pages="15130--15138",
  doi="10.1021/acsnano.4c02644",
  issn="1936-0851",
  url="https://pubs.acs.org/doi/10.1021/acsnano.4c02644"
}