Scientific Results

Acoustic superradiance from optical vortices in self-defocusing cavities

Year: 2009

Authors: Marino F., Ciszak M., Ortolan A.

Autors Affiliation: European Laboratory for Nonlinear Spectroscopy, Via N. Carrara 1, Sesto Fiorentino, I-50019 Firenze, Italy; CNR–Istituto Nazionale di Ottica Applicata, L.go E. Fermi 6, I-50125 Firenze, Italy; Laboratori Nazionali di Legnaro, INFN, Viale dell’Università 2, Legnaro, I-35020 Padova, Italy

Abstract: In a self-defocusing optical cavity, optical-field perturbations on a vortex background behave as sound waves in a (2+1) rotating acoustic black-hole spacetime. Numerical integration of the associated Klein-Gordon equation using typical experimental parameters shows that optical perturbations in the appropriate frequency range are amplified through the mechanism of superradiance. These results suggest the possibility to observe this phenomenon in a common nonlinear optical system.

Journal/Review: PHYSICAL REVIEW A

Volume: 80 (6)      Pages from: 065802  to: 065802

KeyWords: Experimental parameters; Frequency ranges; Klein-Gordon equation; Nonlinear optical systems; Numerical integrations; Optical cavities; Optical field; Optical vortices; Self-defocusing; Sound waves; Spacetime, Acoustics; Optical systems; Radiation; Superradiance; Vortex flow, Numerical methods
DOI: 10.1103/PhysRevA.80.065802

Citations: 10
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