Generalized Fano lineshapes reveal exceptional points in photonic molecules

N. Caselli, F. Intonti, Federico La China, F. Biccari, F. Riboli, A. Gerardino, L. Li, E.H. Linfield, F. Pagliano, A. Fiore, M. Gurioli

Research output: Contribution to journalArticleAcademicpeer-review

39 Citations (Scopus)
192 Downloads (Pure)


The optical behavior of coupled systems, in which the breaking of parity and time-reversal symmetry occurs, is drawing increasing attention to address the physics of the exceptional point singularity, i.e., when the real and imaginary parts of the normal-mode eigenfrequencies coincide. At this stage, fascinating phenomena are predicted, including electromagnetic-induced transparency and phase transitions. To experimentally observe the exceptional points, the near-field coupling to waveguide proposed so far was proved to work only in peculiar cases. Here, we extend the interference detection scheme, which lies at the heart of the Fano lineshape, by introducing generalized Fano lineshapes as a signature of the exceptional point occurrence in resonant-scattering experiments. We investigate photonic molecules and necklace states in disordered media by means of a near-field hyperspectral mapping. Generalized Fano profiles in material science could extend the characterization of composite nanoresonators, semiconductor nanostructures, and plasmonic and metamaterial devices.

Original languageEnglish
Article number396
Number of pages8
JournalNature Communications
Issue number1
Publication statusPublished - 1 Dec 2018


  • Nanostructures
  • Optical Phenomena
  • Photons
  • Semiconductors
  • Spectrum Analysis


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