Characteristics of effective-medium-clad dielectric waveguides

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dc.contributor.authorGao, W.
dc.contributor.authorLee, W.S.L.
dc.contributor.authorYu, X.
dc.contributor.authorFujita, M.
dc.contributor.authorNagatsuma, T.
dc.contributor.authorFumeaux, C.
dc.contributor.authorWithayachumnankul, W.
dc.date.issued2021
dc.description.abstractEffective-medium-clad dielectric waveguides are purely built into a single high-resistivity float-zone silicon wafer with their claddings defined by deep subwavelength perforations. The waveguides are substrate-free while supporting both E x 11 and E y 11 modes with low loss and low dispersion. This article extends the investigations of the waveguides by analyzing the dispersion, cross-polarization, and crosstalk together with the characteristics of bends and crossings over an operation frequency range of 220- 330 GHz (WR-3 band). Taking the E x 11 mode as an example, the experimental results show an average measured attenuation coefficient of 0.075 dB/cm and a group velocity dispersion ranging from around ±10 ps/THz/mm across the whole band. A crosstalk level below -10 dB is measured for parallel waveguides with a separation of 0.52λ 0 at 300 GHz. The realized waveguides show a bending loss ranging from 0.500 to 0.025 dB per bend and a crosstalk at crossing below -15 dB from 220 to 330 GHz. Due to the different dispersion characteristics, the E y 11 mode has similar performances but with its operation frequency range reduced to 260-330 GHz. Limited by the measurement setup, a cross-coupling between the E x 11 and E y 11 modes is measured to be below -20 dB over the whole band. This in-depth investigation of effective-medium-clad waveguides will form a basis for terahertz-integrated platforms.
dc.description.statementofresponsibilityWeijie Gao, Wendy S. L. Lee, Xiongbin Yu, Masayuki Fujita, Tadao Nagatsuma, Christophe Fumeaux ... et al.
dc.identifier.citationIEEE Transactions on Terahertz Science and Technology, 2021; 11(1):28-41
dc.identifier.doi10.1109/TTHZ.2020.3023917
dc.identifier.issn2156-342X
dc.identifier.issn2156-3446
dc.identifier.orcidGao, W. [0000-0002-6082-6993]
dc.identifier.orcidLee, W.S.L. [0000-0001-7760-6121]
dc.identifier.orcidFumeaux, C. [0000-0001-6831-7213]
dc.identifier.orcidWithayachumnankul, W. [0000-0003-1155-567X]
dc.identifier.urihttp://hdl.handle.net/2440/129998
dc.language.isoen
dc.publisherInstitute of Electrical and Electronics Engineers
dc.relation.granthttp://purl.org/au-research/grants/arc/ARC DP180103561
dc.rights© 2021, IEEE
dc.source.urihttps://doi.org/10.1109/tthz.2020.3023917
dc.subjectOptical waveguides; silicon; dispersion; dielectrics; permittivity; crosstalk
dc.titleCharacteristics of effective-medium-clad dielectric waveguides
dc.typeJournal article
pubs.publication-statusPublished

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