Active control of anapole states by structuring the phase-change alloy Ge2Sb2Te5

Jingyi Tian, Hao Luo, Yuanqing Yang (), Fei Ding, Yurui Qu, Ding Zhao, Min Qiu () and Sergey I. Bozhevolnyi
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Jingyi Tian: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University
Hao Luo: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University
Yuanqing Yang: SDU Nano Optics, University of Southern Denmark
Fei Ding: SDU Nano Optics, University of Southern Denmark
Yurui Qu: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University
Ding Zhao: DTU Danchip/Cen, Technical University of Denmark
Min Qiu: State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University
Sergey I. Bozhevolnyi: SDU Nano Optics, University of Southern Denmark

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract 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 (Δλ/λ ~ 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.

Date: 2019
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DOI: 10.1038/s41467-018-08057-1

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