Photon-pair generation in nonlinear metal-dielectric 1D photonic structures
Dalibor Jav\r{u}rek, Jan Pe\v{r}ina Jr., Ji\v{r}\'i Svozil\'ik
TL;DR
This paper demonstrates that nonlinear metal-dielectric layered structures can efficiently generate entangled photon pairs with narrow spectra and strong directionality, suitable for photon-atom interactions, by enhancing electric fields despite metal losses.
Contribution
It introduces a method to generate entangled photon pairs in layered metal-dielectric structures with enhanced efficiency and spectral control, addressing loss issues in metal layers.
Findings
Efficient entangled photon-pair generation in layered structures.
Narrow spectral and directional photon-pair emission.
High electric-field enhancement compensates metal losses.
Abstract
Nonlinear metal-dielectric layered structures are shown to be able to efficiently generate entangled photon pairs using spontaneous parametric down-conversion. Increase of electric-field amplitudes in these structures enhanced by the presence of metal layers is sufficient to compensate for losses inside thin metal layers. As an example, photon pairs emitted from a structure composed of alternating nonlinear dielectric GaN layers and metal Ag layers are analyzed in spectral, temporal as well as spatial domains. Also correlations and entanglement between two photons in a pair are determined. Very narrow photon-pair spectra together with strong directionality of photon-pair emission are observed making the photons suitable for photon-atom interactions. Highly enhanced electric-field amplitudes provide high photon-pair generation efficiencies.
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