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Active control of anapole states by structuring the phase-change alloy Ge2Sb2Te5
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Zhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China..
Univ Southern Denmark, SDU Nano Opt, Campusvej 55, DK-5230 Odense, Denmark..ORCID iD: 0000-0001-7139-1254
Univ Southern Denmark, SDU Nano Opt, Campusvej 55, DK-5230 Odense, Denmark..
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 396Article in journal (Refereed) Published
Abstract [en]

High-index dielectric nanoparticles supporting a distinct series of Mie resonances have enabled a new class of optical antennas with unprecedented functionalities. The great wealth of multipolar responses has not only brought in new physical insight but also spurred practical applications. However, how to make such a colorful resonance palette actively tunable is still elusive. Here, we demonstrate that the structured phase-change alloy Ge2Sb2Te5 (GST) can support a diverse set of multipolar Mie resonances with active tunability. By harnessing the dramatic optical contrast of GST, we realize broadband (del lambda/lambda similar to 15%) mode shifting between an electric dipole resonance and an anapole state. Active control of higher-order anapoles and multimodal tuning are also investigated, which make the structured GST serve as a multispectral optical switch with high extinction contrasts (>6 dB). With all these findings, our study provides a new direction for realizing active nanophotonic devices.

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NATURE PUBLISHING GROUP , 2019. Vol. 10, article id 396
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URN: urn:nbn:se:kth:diva-243948DOI: 10.1038/s41467-018-08057-1ISI: 000456395200002PubMedID: 30674900Scopus ID: 2-s2.0-85060373127OAI: oai:DiVA.org:kth-243948DiVA, id: diva2:1293916
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QC 20190305

Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05Bibliographically approved

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Tian, Jingyi

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