Mid-infrared radiative emission from bright hot plasmons in graphene

Laura Kim, Seyoon Kim, Pankaj K. Jha, Victor W. Brar, Harry A. Atwater

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Carrier excitation and decay processes in graphene are of broad interest since relaxation pathways that are not present in conventional materials are enabled by a gapless Dirac electronic band structure. Here, we report that a previously unobserved decay pathway—hot plasmon emission—results in Fermi-level-dependent mid-infrared emission in graphene. Our observations of non-thermal contributions to Fermi-level-dependent radiation are an experimental demonstration of hot plasmon emission arising from a photo-inverted carrier distribution in graphene achieved via ultrafast optical excitation. Our calculations indicate that the reported plasmon emission process can be several orders of magnitude brighter than Planckian emission mechanisms in the mid-infrared spectral range. Both the use of gold nanodisks to promote scattering and localized plasmon excitation and polarization-dependent excitation measurements provide further evidence for bright hot plasmon emission. These findings define an approach for future work on ultrafast and ultrabright graphene emission processes and mid-infrared light source applications.

Original languageEnglish (US)
Pages (from-to)805-811
Number of pages7
JournalNature Materials
Volume20
Issue number6
DOIs
StatePublished - Jun 2021
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Mid-infrared radiative emission from bright hot plasmons in graphene'. Together they form a unique fingerprint.

Cite this