TY - GEN
T1 - Extremely efficient coupling of silica toroid microresonator to silicon chip with photonic crystal waveguide
AU - Zhuang, Yuyang
AU - Kumazaki, Hajime
AU - Fujii, Shun
AU - Tanabe, Takasumi
N1 - Publisher Copyright:
© 2019 IEEE
PY - 2019
Y1 - 2019
N2 - Compact and low-loss coupling to whispering gallery mode (WGM) microresonators is important for a wide range of applications from fundamental physics to sensing and lasing, including a microresonator frequency comb. High-Q microresonators have been fabricated with silica and crystalline WGMs but highly efficient, robust, and compact coupling remained a challenge [1]. Although coupling to a silicon (Si) chip will allow a variety of applications, the major challenge is the large refractive index mismatch between high-Q microresonators (e.g., silica; nsilica = 1.44) and the commonly used photonic platforms (e.g., Si; nSi = 3.48) [2]. The large refractive index difference leads to a large phase mismatch. Here we found and demonstrated experimentally that extremely efficient coupling between a WGM and a Si chip is possible by using a 2D photonic crystal (PhC) waveguide (WG).
AB - Compact and low-loss coupling to whispering gallery mode (WGM) microresonators is important for a wide range of applications from fundamental physics to sensing and lasing, including a microresonator frequency comb. High-Q microresonators have been fabricated with silica and crystalline WGMs but highly efficient, robust, and compact coupling remained a challenge [1]. Although coupling to a silicon (Si) chip will allow a variety of applications, the major challenge is the large refractive index mismatch between high-Q microresonators (e.g., silica; nsilica = 1.44) and the commonly used photonic platforms (e.g., Si; nSi = 3.48) [2]. The large refractive index difference leads to a large phase mismatch. Here we found and demonstrated experimentally that extremely efficient coupling between a WGM and a Si chip is possible by using a 2D photonic crystal (PhC) waveguide (WG).
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M3 - Conference contribution
AN - SCOPUS:85084562509
T3 - Optics InfoBase Conference Papers
BT - The European Conference on Lasers and Electro-Optics, CLEO_Europe_2019
PB - OSA - The Optical Society
T2 - The European Conference on Lasers and Electro-Optics, CLEO_Europe_2019
Y2 - 23 June 2019 through 27 June 2019
ER -