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Unravelling the Role of Electric and Magnetic Dipoles in Biosensing with Si Nanoresonators
KTH, School of Engineering Sciences (SCI), Applied Physics. ICFO - Institut de Ciències Fotòniques, Barcelona Institute of Science and Technology, Castelldefels Barcelona, 08860, Spain.ORCID iD: 0000-0002-4437-6291
2019 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 13, no 4, p. 4582-4588Article in journal (Refereed) Published
Abstract [en]

High refractive index dielectric nanoresonators are attracting much attention due to their ability to control both electric and magnetic components of light. Due to the combination of confined modes with reduced absorption losses, they have recently been proposed as an alternative to nanoplasmonic biosensors. In this context, we study the use of semirandom silicon nanocylinder arrays, fabricated with simple and scalable colloidal lithography for the efficient and reliable detection of biomolecules in biological samples. Interestingly, electric and magnetic dipole resonances are associated with two different transduction mechanisms: extinction decrease and resonance red shift. By contrasting both observables, we identify clear advantages in tracking changes in the extinction magnitude. Our data demonstrate that, despite its simplicity, the proposed platform is able to detect prostate-specific antigen in human serum with limits of detection meeting clinical needs.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 13, no 4, p. 4582-4588
Keywords [en]
biosensing, dielectric nanophotonics, lab-on-a-chip, Mie resonances, optical nanoresonators, silicon nanoresonators
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URN: urn:nbn:se:kth:diva-251886DOI: 10.1021/acsnano.9b00572ISI: 000466052900083Scopus ID: 2-s2.0-85064132834OAI: oai:DiVA.org:kth-251886DiVA, id: diva2:1318185
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QC 20190527

Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2020-02-19Bibliographically approved

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