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Photonic crystal waveguides as sources of counterpropagating factorizable biphoton states

: Saravi, S.; Pertsch, T.; Setzpfandt, F.


Optics Letters 44 (2019), No.1, pp.69-72
ISSN: 0146-9592
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
FKZ 03ZZ0434
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
FKZ 13N14877
Deutsche Forschungsgemeinschaft DFG
SE 2749/1 - 1
Journal Article
Fraunhofer IOF ()

We demonstrate numerically that photonic crystal slab waveguides can generate spectrally unentangled biphoton states, highly desired for heralding of single photons. We achieve this by modally phase matching a counterpropagating spontaneous parametric down-conversion process, in a fully integrated scheme and without the need for periodic poling. Such a configuration is an ideal integrated source of heralded single photons, as it spatially separates the photons of a pair at the source without any extra components, while allowing for generation of spectrally narrow photons on a very short length scale.