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Grating coupler design for low-cost fabrication in amorphous silicon photonic integrated circuits

2024-08-23Journal article Open access
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dc.contributor.authorAlmeida, Daniel
dc.contributor.authorLourenço, Paulo
dc.contributor.authorFantoni, Alessandro
dc.contributor.authorCosta, João
dc.contributor.authorVieira, Manuela
dc.date.accessioned2024-11-06T16:15:22Z
dc.date.available2024-11-06T16:15:22Z
dc.date.issued2024-08-23
dc.description.abstractPhotonic circuits find applications in biomedicine, manufacturing, quantum computing and communications. Photonic waveguides are crucial components, typically having cross-section orders of magnitude inferior when compared with other photonic components (e.g., optical fibers, light sources and photodetectors). Several light-coupling methods exist, consisting of either on-plane (e.g., adiabatic and end-fire coupling) or off-plane methods (e.g., grating and vertical couplers). The grating coupler is a versatile light-transference technique which can be tested at wafer level, not requiring specific fiber terminations or additional optical components, like lenses, polarizers or prisms. This study focuses on fully-etched grating couplers without a bottom reflector, made from hydrogenated amorphous silicon (a-Si:H), deposited over a silica substrate. Different coupler designs were tested, and of these we highlight two: the superimposition of two lithographic masks with different periods and an offset between them to create a random distribution and a technique based on the quadratic refractive-index variation along the device’s length. Results were obtained by 2D-FDTD simulation. The designed grating couplers achieve coupling efficiencies for the TE-like mode over −8 dB (mask overlap) and −3 dB (quadratic variation), at a wavelength of 1550 nm. The coupling scheme considers a 220 nm a-Si:H waveguide and an SMF-28 optical fiber.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAlmeida, D.; Lourenço, P.; Fantoni, A.; Costa, J.; Vieira, M. Grating Coupler Design for Low-Cost Fabrication in Amorphous Silicon Photonic Integrated Circuits. Photonics 2024, 11(9), 783. https://doi.org/10.3390/photonics11090783pt_PT
dc.identifier.doi10.3390/photonics11090783pt_PT
dc.identifier.eissn2304-6732
dc.identifier.urihttp://hdl.handle.net/10400.21/17851
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationSFRH/BD/07792/2021 - Fundação para a Ciência e a Tecnologiapt_PT
dc.relationCentre of Technology and Systems
dc.relationCentre of Technology and Systems
dc.relation.publisherversionhttps://www.mdpi.com/2304-6732/11/9/783pt_PT
dc.subjectGrating couplerpt_PT
dc.subjectLight couplingpt_PT
dc.subjectPhotonic waveguidept_PT
dc.subjectSilicon-on-insulatorpt_PT
dc.subjectAmorphous siliconpt_PT
dc.subjectOff-plane couplingpt_PT
dc.titleGrating coupler design for low-cost fabrication in amorphous silicon photonic integrated circuitspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Technology and Systems
oaire.awardTitleCentre of Technology and Systems
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00066%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00066%2F2020/PT
oaire.citation.endPage30pt_PT
oaire.citation.issue9pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titlePhotonicspt_PT
oaire.citation.volume11pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameLourenço
person.familyNameFantoni
person.familyNameCosta
person.familyNameVieira
person.givenNamePaulo
person.givenNameAlessandro
person.givenNameJoão
person.givenNameManuela
person.identifier10792
person.identifier.ciencia-id431F-5C2C-00FB
person.identifier.ciencia-id241E-E87C-552F
person.identifier.ciencia-id2314-A300-7C09
person.identifier.ciencia-id9516-E25E-BB8E
person.identifier.orcid0000-0002-8785-445X
person.identifier.orcid0000-0002-9938-0351
person.identifier.orcid0000-0002-8058-3685
person.identifier.orcid0000-0002-1150-9895
person.identifier.ridK-1105-2016
person.identifier.ridV-7860-2017
person.identifier.scopus-author-id7006535604
person.identifier.scopus-author-id35810047500
person.identifier.scopus-author-id7202140173
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationcf9e37d2-28dd-4672-a5e8-ef49ded4420f
relation.isAuthorOfPublication9f35eb1e-83e4-4342-a86d-265604301499
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