Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-08057-1
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Funding
- National Key Research and Development Program of China [2017YFA0205700]
- National Natural Science Foundation of China [61425023]
- European Research Council (the PLAQNAP project) [341054]
- University of Southern Denmark (SDU2020 funding)
- Chinese Scholarship Council (CSC) [201600160020, 201706320254]
- European Union's Horizon 2020 research and innovation program under the Marie SkA,odowska-Curie grant [713683]
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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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