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  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper ef_3_3

Rotating spacetime and wave amplification in superfluids of light

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Abstract

Penrose superradiance is the amplification of waves scattered by a rapidly rotating object. This process was proposed in 1969 by Penrose for a rotating black hole [1] and in 1971 by Zel’dovich for electromagnetic waves scattered by a metallic rotating cylinder [2]. Wave whose angular frequency 𝜔 satisfies the condition 𝜔 < 𝑚Ω are amplified, where 𝑚 is the waves’ angular momentum and Ω is the cylinder’s angular velocity. Superradiant scattering is not unique to for electromagnetic waves. Recently a direct measurement of superradiance in water waves has been reported in a draining bathtub experiment [3].

© 2019 IEEE

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