Generalized Fano lineshapes reveal exceptional points in photonic molecules

Niccolò Caselli (), Francesca Intonti, Federico La China, Francesco Biccari, Francesco Riboli, Annamaria Gerardino, Lianhe Li, Edmund H. Linfield, Francesco Pagliano, Andrea Fiore and Massimo Gurioli
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Niccolò Caselli: European Laboratory for Nonlinear Spectroscopy
Francesca Intonti: European Laboratory for Nonlinear Spectroscopy
Federico La China: European Laboratory for Nonlinear Spectroscopy
Francesco Biccari: European Laboratory for Nonlinear Spectroscopy
Francesco Riboli: European Laboratory for Nonlinear Spectroscopy
Annamaria Gerardino: CNR
Lianhe Li: University of Leeds
Edmund H. Linfield: University of Leeds
Francesco Pagliano: Eindhoven University of Technology
Andrea Fiore: Eindhoven University of Technology
Massimo Gurioli: University of Florence

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-02855-3

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