Topological Control of 2D Perovskite Emission in the Strong Coupling Regime

Seongheon Kim, Byung Hoon Woo, Soo Chan An, Yeonsoo Lim, In Cheol Seo, Dai Sik Kim, Seokjae Yoo, Q. Han Park, Young Chul Jun

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Momentum space topology can be exploited to manipulate radiation in real space. Here we demonstrate topological control of 2D perovskite emission in the strong coupling regime via polaritonic bound states in the continuum (BICs). Topological polarization singularities (polarization vortices and circularly polarized eigenstates) are observed at room temperature by measuring the Stokes parameters of photoluminescence in momentum space. Particularly, in symmetry-broken structures, a very large degree of circular polarization (DCP) of ∼0.835 is achieved in the perovskite emission, which is the largest in perovskite materials to our knowledge. In the strong coupling regime, lower polariton modes shift to the low-loss spectral region, resulting in strong emission enhancement and large DCP. Our reciprocity analysis reveals that DCP is limited by material absorption at the emission wavelength. Polaritonic BICs based on 2D perovskite materials combine unique topological features with exceptional material properties and may become a promising platform for active nanophotonic devices.

Original languageEnglish
Pages (from-to)10076-10085
Number of pages10
JournalNano Letters
Issue number23
Publication statusPublished - 2021 Dec 8


  • 2D organic-inorganic hybrid perovskites
  • bound states in the continuum
  • exciton polaritons
  • photoluminescence
  • strong coupling
  • topological polarization singularities

ASJC Scopus subject areas

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


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