Generalized Fano lineshapes reveal exceptional points in photonic molecules

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...

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Bibliographic Details
Published in:Nature communications 2018-01, Vol.9 (1), p.396-8, Article 396
Main Authors: Caselli, Niccolò, Intonti, Francesca, La China, Federico, Biccari, Francesco, Riboli, Francesco, Gerardino, Annamaria, Li, Lianhe, Linfield, Edmund H., Pagliano, Francesco, Fiore, Andrea, Gurioli, Massimo
Format: Article
Language:English
Subjects:
132/124
147/136
639/624/1107/527/1989
639/766/400/1021
Coupling (molecular)
Humanities and Social Sciences
Metamaterials
multidisciplinary
Nanostructures
Optical Phenomena
Phase transitions
Photonics
Photons
Physics
Resonant frequencies
Science
Science (multidisciplinary)
Semiconductors
Spectrum Analysis
Transparency
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Summary: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. Fano lineshapes are found in many photonic systems where discrete and extended spectra interfere. Here, the authors extend this description and introduce generalized Fano lineshapes to describe the results from hyperspectral mapping around an exceptional point in a coupled-cavity system.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-018-02855-3