Scientific Results

Generalized Fano lineshapes reveal exceptional points in photonic molecules

Year: 2018

Authors: Caselli N., Intonti F., La China F., Biccari F., Riboli F., Gerardino A., Li LH., Linfield EH., Pagliano F., Fiore A., Gurioli M.

Autors Affiliation: [Caselli, Niccolo; Intonti, Francesca; La China, Federico; Biccari, Francesco; Riboli, Francesco] European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, FI, Italy.
[Caselli, Niccolo; Intonti, Francesca; La China, Federico; Biccari, Francesco; Gurioli, Massimo] Univ Florence, Dept Phys, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.
[Caselli, Niccolo] CSIC, Inst Ciencia Mat Madrid, Calle Sor Juana Ines de la Cruz 3, Madrid 28049, Spain.
[Riboli, Francesco] CNR, Ist Nazl Ott, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
[Gerardino, Annamaria] CNR, Inst Photon & Nanotechnol, Via Cineto Romano 42, I-00156 Rome, Italy.
[Li, Lianhe; Linfield, Edmund H.] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England.
[Pagliano, Francesco; Fiore, Andrea] Eindhoven Univ Technol, Dept Appl Phys, Inst Photon Integrat, NL-5600 MB Eindhoven, Netherlands.

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.

Journal/Review: NATURE COMMUNICATIONS

Volume: 9      Pages from: 396-1  to: 396-8

KeyWords: electromagnetically induced transparency; disordered media; resonance; symmetry; systems
DOI: 10.1038/s41467-018-02855-3

Citations: 11
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