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Integrated Photonic Platform for Rare-Earth Ions in Thin Film Lithium Niobate

TitleIntegrated Photonic Platform for Rare-Earth Ions in Thin Film Lithium Niobate
Publication TypeJournal Article
Year of Publication2020
AuthorsS. Dutta, E. A. Goldschmidt, S. Barik, U. Saha, and E. Waks
JournalNano Lett.
Volume20
Pagination741-747
Date PublishedJAN
Type of ArticleArticle
ISSN1530-6984
Keywordsintegrated photonics, optical signal processing, Rare-earth ions, spectral hole burning quantum information processing, thin film lithium niobate
Abstract

Rare-earth ion ensembles doped in single crystals are a promising materials system with widespread applications in optical signal processing, lasing, and quantum information processing. Incorporating rare-earth ions into integrated photonic devices could enable compact lasers and modulators, as well as on-chip optical quantum memories for classical and quantum optical applications. To this end, a thin film single crystalline wafer structure that is compatible with planar fabrication of integrated photonic devices would be highly desirable. However, incorporating rare-earth ions into a thin film form-factor while preserving their optical properties has proven challenging. We demonstrate an integrated photonic platform for rare-earth ions doped in a single crystalline thin film lithium niobate on insulator. The thin film is composed of lithium niobate doped with Tm3+. The ions in the thin film exhibit optical lifetimes identical to those measured in bulk crystals. We show narrow spectral holes in a thin film waveguide that require up to 2 orders of magnitude lower power to generate than previously reported bulk waveguides. Our results pave the way for scalable on-chip lasers, optical signal processing devices, and integrated optical quantum memories.

DOI10.1021/acs.nanolett.9b04679