Scientific Results

Hermitian and Non-Hermitian Mode Coupling in a Microdisk Resonator Due to Stochastic Surface Roughness Scattering

Year: 2019

Authors: Biasi S., Ramiro-Manzano F., Turri F., Larre PE., Ghulinyan M., Carusotto I., Pavesi L.

Autors Affiliation: Univ Trento, Nanosci Lab, Dipartimento Fis, I-38123 Povo, Italy; Univ Cergy Pontoise, Lab Phys Theor & Modelisat, CNRS, F-95302 Cergy Pontoise, France; Fdn Bruno Kessler, Adv Photon & Photovolta, I-38123 Povo, Italy;Univ Trento, INO CNR BEC Ctr, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy

Abstract: We make use of a phase-sensitive set-up to study the light transmission through a coupled waveguide-microdisk system. We observe a splitting of the transmission resonance leading to an unbalanced doublet of dips. The experimental data are analyzed by using a phasor diagram that correlates the real and the imaginary parts of the complex transmission. In addition, detailed features are evidenced by a complex inverse representation of the data that maps ideal resonances into straight lines and split resonances into complicated curves. Modeling with finite element method simulations suggests that the splitting and the unbalance is caused by an induced chirality in the propagation of the optical fields in the microdisk due to the interplay between the stochastic roughness and the intermodal dissipative coupling, which yield an asymmetric behavior. An analytical model based on the temporal coupled mode theory shows that both a reactive and a dissipative coupling of the counter-propagating modes by the surface roughness of the ring resonator are required to quantitatively reproduce the experimental observations and the numerical simulations.

Journal/Review: IEEE PHOTONICS JOURNAL

Volume: 11 (2)      Pages from: 6101114-1  to: 6101114-14

KeyWords: Optical resonator; backscattering; integrated optics
DOI: 10.1109/JPHOT.2018.2880281

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