Optica Publishing Group

Spatial coherence from Nd3+ quantum emitters mediated by a plasmonic chain

Posted on 2021-07-30 - 15:21
Controlling the coherence properties of Rare Earth emitters in solid-state platforms in the absence of an optical cavity is highly desirable for quantum light-matter interfaces and photonic networks. Here, we demonstrate the possibility of generating directional and spatially coherent light from Nd3+ ions coupled to the longitudinal plasmonic mode of a chain of interacting Ag nanoparticles. The effect of the plasmonic chain on the Nd3+ emission is analyzed by Fourier microscopy, revealing the presence of an interference pattern in which the Nd3+ emission is enhanced at specific directions, as a distinctive signature of spatial coherence. Numerical simulations corroborate the need of near-field coherent coupling of the emitting ions with the plasmonic chain mode. The work provides fundamental insights for controlling the coherence properties of quantum emitters at room temperature and opens new avenues towards Rare Earth based nanoscale hybrid devices for quantum information or optical communication in nanocircuits.


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Javier Fernández-Martínez
Sol Carretero-Palacios
Laura Sánchez-García
Jorge Bravo-Abad
Pablo Molina
Niels van Hoof
Mariola Ramirez
Jaime Rivas
Luisa Bausa
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