Epitaxial single-crystal rare-earth oxide in horizontal slot waveguide for silicon-based integrated active photonic devices
We have epitaxially grown high-quality single-crystal rare-earth oxide thin films, including Gd O and erbium-incorporated (ErGd) O , on silicon-on-insulator substrate, and investigated their optical properties when embedded in horizontal slot waveguides. (ErGd) O with an erbium concentration in the...
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Published in | Optics express Vol. 28; no. 10; pp. 14448 - 14460 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
11.05.2020
|
Online Access | Get full text |
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Summary: | We have epitaxially grown high-quality single-crystal rare-earth oxide thin films, including Gd
O
and erbium-incorporated (ErGd)
O
, on silicon-on-insulator substrate, and investigated their optical properties when embedded in horizontal slot waveguides. (ErGd)
O
with an erbium concentration in the mid-10
cm
range shows well-resolved Stark-split photoluminescence emission peaks in the telecommunications band and a photoluminescence lifetime-concentration product as large as 2.67×10
s·cm
at room-temperature. Using these materials, horizontal slot waveguides with strong optical confinement in low-refractive-index rare-earth oxide layers, have been fabricated for silicon-based integrated active photonic devices. Thanks to the strong light-matter interaction, a large waveguide modal absorption of 88 dB/cm related to erbium ions is achieved, leading to a large potential optical gain. Intense emissions from the waveguides are also observed, with a radiation efficiency on the order of 10
. These results indicate that a combination of epitaxial rare-earth oxide thin films and horizontal slot waveguides provides a promising platform for light amplification and generation on silicon. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1094-4087 1094-4087 |
DOI: | 10.1364/oe.389765 |