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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tian J,Luo H,Yang Y,Ding F,Qu Y,Zhao D,Qiu M,Bozhevolnyi SI

doi

10.1038/s41467-018-08057-1

subject

Has Abstract

pub_date

2019-01-23 00:00:00

pages

396

issue

1

issn

2041-1723

pii

10.1038/s41467-018-08057-1

journal_volume

10

pub_type

杂志文章

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