Rare earth ions are known as promising candidates for building quantum light-matter interface. However, tunable photonic cavity access to rare earth ions in their desired host crystal remains challenging. Here, we demonstrate the integration of erbium doped yttrium orthosilicate (Er 3+ :Y 2 SiO 5 ) with thin-film lithium niobate photonic circuit by plasma-activated direct flip chip bonding. Resonant coupling to erbium ions is realized by on-chip electro-optically tuned high Q lithium niobate micro-ring resonators. Fluorescence and absorption of erbium ions at 1536.48 nm are measured in the waveguides, while the collective ion-cavity cooperativity with micro-ring resonators is assessed to be 0.36. This work presents a versatile scheme for future rare earth ion integrated quantum devices.
@article{osti_1781896,
author = {Yang, Likai and Wang, Sihao and Shen, Mohan and Xu, Yuntao and Xie, Jiacheng and Tang, Hong X.},
title = {Photonic integration of Er <sup>3+</sup> :Y <sub>2</sub> SiO <sub>5</sub> with thin-film lithium niobate by flip chip bonding},
annote = { Rare earth ions are known as promising candidates for building quantum light-matter interface. However, tunable photonic cavity access to rare earth ions in their desired host crystal remains challenging. Here, we demonstrate the integration of erbium doped yttrium orthosilicate (Er 3+ :Y 2 SiO 5 ) with thin-film lithium niobate photonic circuit by plasma-activated direct flip chip bonding. Resonant coupling to erbium ions is realized by on-chip electro-optically tuned high Q lithium niobate micro-ring resonators. Fluorescence and absorption of erbium ions at 1536.48 nm are measured in the waveguides, while the collective ion-cavity cooperativity with micro-ring resonators is assessed to be 0.36. This work presents a versatile scheme for future rare earth ion integrated quantum devices. },
doi = {10.1364/OE.423659},
url = {https://www.osti.gov/biblio/1781896},
journal = {Optics Express},
issn = {ISSN OPEXFF},
number = {10},
volume = {29},
place = {United States},
publisher = {Optical Society of America},
year = {2021},
month = {05}}