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

Dae-Gon Kim, Sangyoon Han, Joonhyuk Hwang, In Hwan Do, Dongin Jeong, Ji-Hun Lim, Yong-Hoon Lee, Muhan Choi, Yong-Hee Lee, Duk-Yong Choi () and Hansuek Lee ()
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Dae-Gon Kim: Korea Advanced Institute of Science and Technology (KAIST)
Sangyoon Han: Korea Advanced Institute of Science and Technology (KAIST)
Joonhyuk Hwang: Korea Advanced Institute of Science and Technology (KAIST)
In Hwan Do: Korea Advanced Institute of Science and Technology (KAIST)
Dongin Jeong: Korea Advanced Institute of Science and Technology (KAIST)
Ji-Hun Lim: Kyungpook National University
Yong-Hoon Lee: Kyungpook National University
Muhan Choi: Kyungpook National University
Yong-Hee Lee: Korea Advanced Institute of Science and Technology (KAIST)
Duk-Yong Choi: Australian National University
Hansuek Lee: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-19799-2

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