Metamaterial engineered silicon photonic coupler for whispering gallery mode microsphere and disk resonators

From National Research Council Canada

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DOI	Resolve DOI: https://doi.org/10.1364/OPTICA.438395
Author	Search for: Farnesi, D.ORCID identifier: https://orcid.org/0000-0001-8439-0453; Search for: Pelli, S.; Search for: Soria, S.ORCID identifier: https://orcid.org/0000-0002-4838-2197; Search for: Nunzi Conti, G.ORCID identifier: https://orcid.org/0000-0002-2239-7622; Search for: Le Roux, X.; Search for: Montesinos Ballester, M.; Search for: Vivien, L.; Search for: Cheben, P.¹ORCID identifier: https://orcid.org/0000-0003-4232-9130; Search for: Alonso-Ramos, C.
Affiliation	National Research Council of Canada. Advanced Electronics and Photonics
Funder	Search for: Agence Nationale de la Recherche
Format	Text, Article
Abstract	Optical microresonators with high quality factors are key in photonic circuits requiring fine spectral filtering or resonant storage of optical power. Silicon (Si) photonics provides high-performance optoelectronic circuits but yields planar Si microresonators with rather low quality factors (Q<10⁵). On the other hand, bulk resonators achieve exceptionally high quality factors, Q>10⁷. Si photonic waveguides and bulk resonators have very different sizes and refractive indices that preclude efficient coupling. Here, we show an efficient method to couple bulk resonators and Si waveguides based on subwavelength metamaterial engineering. We demonstrate up to 99% light coupling efficiency for microspheres and microdisks made of silica, lithium niobate, and calcium fluoride, with 0.3−3.6mm diameter. This achievement could enable the heterogeneous integration of bulk resonators and silicon photonic circuits, with potential applications in sensing, communications, and quantum information.
Publication date	2021-11-23
Publisher	Optica Publishing Group
Licence	Creative Commons, Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
In	Optica 8, no. 12 (23 November 2021): 1511–1514.
Language	English
Peer reviewed	Yes
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Record identifier	5dad2136-0f2f-4713-86da-e59e216b7916
Record created	2022-10-25
Record modified	2022-10-25

Date modified:: 2025-11-17