Universal light-guiding geometry for on-chip resonators having extremely high Q-factor

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By providing an effective way to leverage nonlinear phenomena in integrated devices, high-Q optical resonators have led to recent advances in on-chip photonics. However, developing fabrication processes to shape any new material into a resonator with extremely smooth surfaces on a chip has been an exceptionally challenging task. Here, we describe a universal method to implement ultra-high-Q resonators with any new material having desirable properties that can be deposited by physical vapor deposition. Using this method light-guiding cores with surface roughness on the molecular-scale are created automatically on pre-patterned substrates. Its efficacy has been verified using As2S3, a chalcogenide glass that has high-nonlinearity. The Q-factor of the As2S3 resonator so-developed approached the propagation loss record achieved in chalcogenide fibers which were limited by material losses. Owing to the boosted Q-factor, lasing by stimulated Brillouin scattering has been demonstrated with 100 times lower threshold power than the previous record. High-Q resonators are used to enhance nonlinear phenomena in photonics, but developing a fabrication process to shape a new material into a resonator is challenging and costly. Here, the authors present a method using vapour deposition on pre-patterned substrates to fabricate resonators with any new material.
Publisher
NATURE RESEARCH
Issue Date
2020-11
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.11, no.1, pp.5933

ISSN
2041-1723
DOI
10.1038/s41467-020-19799-2
URI
http://hdl.handle.net/10203/278419
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
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