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Enhancement of the photon pair generation rate by spontaneous four-wave mixing in bent waveguides

Paszkiewicz, Maria ORCID iD icon 1,2; Rockstuhl, Carsten ORCID iD icon 1,3
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)
2 Scientific Computing Center (SCC), Karlsruher Institut für Technologie (KIT)
3 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Enhancing nonlinear optical effects is critical to improving the performance of many functional devices for nonlinear and quantum optical applications. Here, we study the possibility of bending a waveguide to enhance the photon pair generation rate in a spontaneous four-wave mixing process. Whereas intuition might suggest that bending makes the process less efficient because the waveguides are more lossy when bent, we show that the increase in the effective nonlinearity outperforms the loss disadvantage for moderate bending radii. That can be explained by a better localization of the guided eigenmodes, leading to a reduced mode area. By studying selected waveguide devices with a fixed length, we demonstrate an improvement in the photon pair generation rate between 5% and 210% for an optimal bending radius. These findings have implications for the future design of integrated photonic devices for quantum optical applications, especially in cases where the chip estate tends to be a limiting factor.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2025
Sprache Englisch
Identifikator ISSN: 2469-9926
KITopen-ID: 1000178476
HGF-Programm 46.21.01 (POF IV, LK 01) Domain-Specific Simulation & SDLs and Research Groups
Erschienen in Physical Review A
Band 111
Heft 1
Seiten Art.-Nr.: 013507
Vorab online veröffentlicht am 07.01.2025
Nachgewiesen in Scopus
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Originalveröffentlichung
DOI: 10.1103/PhysRevA.111.013507
Seitenaufrufe: 17
seit 29.01.2025
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