Freiburg 2019 – wissenschaftliches Programm
FM 53.6: Talk
Mittwoch, 25. September 2019, 15:30–15:45, 1010
Photon-pair generation mediated by coupling of emitters to nonlinear photonic nanostructures — •Sina Saravi1,4, Alexander Poddubny2,3, Thomas Pertsch1, Frank Setzpfandt1, and Andrey A. Sukhorukov4 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, Germany — 2ITMO University, St. Petersburg, Russia — 3Ioffe Institute, St. Petersburg, Russia — 4Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australia
We theoretically investigate a hybrid system of an atom-like emitter coupled to a nanostructured nonlinear photonic system. In our proposed configuration, the response of the nonlinear optical system is suppressed to achieve a regime where the response of the hybrid system is dominating. Using a rigorous Green's function quantization method to model the system, we show that in photonic nanostructures with spectral gaps with zero optical density-of-states, nonlinear effects like spontaneous photon-pair generation are prohibited if the frequency of one of the generated photons is in the gap. Moreover, we show that a coupled emitter with a transition frequency in the photonic gap mediates the otherwise forbidden generation of photon pairs, where one photon directly excites the emitter and the other occupies an optical mode. This effect can serve as a sensitive indicator for the presence and excitation of single atoms. Furthermore, this scheme could be used to directly interface quantum memories with photon-pair sources or to realize a deterministic and tunable single-photon source.