Benvenuti nell'Anagrafe della Ricerca d'Ateneo
La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.
EnglishWe have designed and fabricated a set of AlGaAs multilayer waveguides, which can serve as a source of entangled photons at 1.55 mu m through parametric fluorescence. In our scheme two counterpropagating, orthogonally polarized signal/idler modes are nonlinearly generated by a pump wave impinging on the upper surface of the waveguide. To check the compliance with design specifications on phase-matching wavelength and parametric gain, we have systematically measured effective indices and surface-emitting second-harmonic generation, respectively. This characterization allowed us to single out a nominal sample with optimum performances, which we numerically modeled for counterpropagating parametric fluorescence. We predict a pair generation efficiency eta(PF)=4x10(-13) (signal photons per pump photon). For a 1 W (peak), 100 ns pump pulse at normal incidence, this corresponds to about 14 photons per dark count with state-of-the-art avalanche photodiodes.
Ravaro M, Seurin Y, Ducci S, Leo G, Berger V, De Rossi A, et al. (2005). Nonlinear AlGaAs waveguide for the generation of counterpropagating twin photons in the telecom range. JOURNAL OF APPLIED PHYSICS, 98(6).
| Titolo: | Nonlinear AlGaAs waveguide for the generation of counterpropagating twin photons in the telecom range | |
| Autori: | ||
| Data di pubblicazione: | 2005 | |
| Rivista: | ||
| Citazione: | Ravaro M, Seurin Y, Ducci S, Leo G, Berger V, De Rossi A, et al. (2005). Nonlinear AlGaAs waveguide for the generation of counterpropagating twin photons in the telecom range. JOURNAL OF APPLIED PHYSICS, 98(6). | |
| Abstract: | We have designed and fabricated a set of AlGaAs multilayer waveguides, which can serve as a source of entangled photons at 1.55 mu m through parametric fluorescence. In our scheme two counterpropagating, orthogonally polarized signal/idler modes are nonlinearly generated by a pump wave impinging on the upper surface of the waveguide. To check the compliance with design specifications on phase-matching wavelength and parametric gain, we have systematically measured effective indices and surface-emitting second-harmonic generation, respectively. This characterization allowed us to single out a nominal sample with optimum performances, which we numerically modeled for counterpropagating parametric fluorescence. We predict a pair generation efficiency eta(PF)=4x10(-13) (signal photons per pump photon). For a 1 W (peak), 100 ns pump pulse at normal incidence, this corresponds to about 14 photons per dark count with state-of-the-art avalanche photodiodes. | |
| Handle: | http://hdl.handle.net/11590/133312 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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