Near-field nano-spectroscopy of strong mode coupling in phonon-polaritonic crystals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

4 Scopus Citations
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Author(s)

  • Xin Hu
  • Tsz Wing Lo
  • Andrea Mancini
  • Christopher R. Gubbin
  • Francesco Martini
  • Jian Zhang
  • Zhongmiao Gong
  • Alberto Politi
  • Simone De Liberato
  • Xuefeng Zhang
  • Stefan A. Maier

Detail(s)

Original languageEnglish
Article number021414
Journal / PublicationApplied Physics Reviews
Volume9
Issue number2
Online published24 May 2022
Publication statusPublished - Jun 2022

Abstract

Strongly coupled phonon polaritons in patterned polar dielectric nano-resonators give rise to the formation of hybridized energy states with intriguing properties. However, direct observation of mode coupling in these periodic nanostructures is still challenging for momentum-matching-required far-field spectroscopies. Here, we explore the near-field response of strong coupling between propagating and localized polariton modes sustained in SiC phonon polaritonic crystals (PhPCs) to reveal the evolution of Rabi splittings with the change of lattice constant in the near-field perspective. The near-field nano-spectra of PhPCs show distinct Rabi splitting near the forbidden bands of ∼16 cm-1 in the band structures. In particular, an exotic three-polariton-coupling effect is observed with three splitting peaks in the nano-spectra induced by the interaction between local monopolar modes in nano-pillars and zone-folded phonon polaritons. Furthermore, sharp dips indicating weak near-field scatterings appear in nano-spectra at the intrinsic frequencies of the monopolar modes with strong local-field enhancement, which are estimated to be bright scattering peaks intuitively. These results would inspire the dispersion engineering and characterization of coupled phononic nano-resonators for diverse nanophotonic applications.

Citation Format(s)

Near-field nano-spectroscopy of strong mode coupling in phonon-polaritonic crystals. / Hu, Xin; Lo, Tsz Wing; Mancini, Andrea et al.
In: Applied Physics Reviews, Vol. 9, No. 2, 021414, 06.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review