Imaging Strongly Coupled Plasmon-Phonon Modes in Mid-Infrared Double Antennas

Maureen J. Lagos, Philip E. Batson, Zihan Lyu, Ulrich Hohenester

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Strong-coupling effects alter the polaritonic states of metal-dielectric nanostructures and, therefore, can be used to tailor the response of infrared (IR) photonic elements. We report on the development of a simple IR double-nanoantenna platform that achieves strong coupling between plasmon and phonon polaritons using extreme aspect ratio Al and amorphous SiO2 antennas of modest quality-factor, equaling coupling performance of platforms using novel materials. Our spatially resolved spectroscopy studies reveal Rabi splitting (26 meV) and offer a detailed study of the strongly coupled mode structure within the nanoantenna, with unprecedented spatial sensitivity (<10 nm). We imaged the spatial distribution of strongly coupled modes, accessing the local electromagnetic density of states of the system, obtaining key information on photonic population. Our study obtains strong-coupling behavior in hybrid nanosystems using geometry, rather than materials properties, promising high performance using cheaper and more abundant materials.

Original languageEnglish (US)
Pages (from-to)1293-1300
Number of pages8
JournalACS Photonics
Issue number5
StatePublished - May 19 2021

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Rabi states
  • mid-IR photonics
  • plasmon-phonon coupling
  • strong-coupling
  • terahertz photonics
  • vibrational EELS


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