Measurement of Penrose Superradiance in a Photon Superfluid
| Autor: | Maria Chiara Braidotti, Radivoje Prizia, Calum Maitland, Francesco Marino, Angus Prain, Ilya Starshynov, Niclas Westerberg, Ewan M. Wright, Daniele Faccio |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 128 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | The superradiant amplification in the scattering from a rotating medium was first elucidated by Sir Roger Penrose over 50 years ago as a means by which particles could gain energy from rotating black holes. Despite this fundamental process being ubiquitous also in wave physics, it has only been observed once experimentally, in a water tank, and never in an astrophysical setting. Here, we measure this amplification for a nonlinear optics experiment in the superfluid regime. In particular, by focusing a weak optical beam carrying orbital angular momentum onto the core of a strong pump vortex beam, negative norm modes are generated and trapped inside the vortex core, allowing for amplification of a reflected beam. Our experiment demonstrates amplified reflection due to a novel form of nonlinear optical four-wave mixing, whose phase-relation coincides with the Zel'dovich-Misner condition for Penrose superradiance in our photon superfluid, and unveil the role played by negative frequency modes in the process.} Comment: 11 pages, 4 figures |
| Databáze: | OpenAIRE |
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