Journal
ACS PHOTONICS
Volume 6, Issue 8, Pages 2126-2132Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b00674
Keywords
light scattering; cloaking; anapole; superscattering; tuning; phase-change materials; Kerker regime
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Funding
- Air Force Office of Scientific Research
- National Science Foundation
- Ministry of Education and Science of Russian Federation [2.2267.2017/4.6]
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Phase-change materials (PCMs) can switch between different crystalline states as a function of an external bias, offering a pronounced change of their dielectric function. To take full advantage of these features for active photonics and information storage, stand-alone PCMs are not sufficient because the phase transition requires strong pump fields. Here, we explore hybrid metal-semiconductor core-shell nanoantennas loaded with PCMs, enabling a drastic switch in scattering features as the load changes its phase. Large scattering, beyond the limits of small resonant particles, is achieved by spectrally matching different Mie resonances, while scattering cancellation and cloaking is achieved at anapole state with out-of-phase electric dipole oscillations in the PCM shell and Ag core. We show that by tuning the PCM crystallinity, we can largely vary total (similar to 15 times) and forward (similar to 100 times) scattering. Remarkably, a substantial reconfiguration of the scattering pattern from Kerker (zero backward) to anti-Kerker (almost zero forward) regimes with little change (similar to 5%) in crystallinity is predicted, which makes this structure promising for low-intensity nonlinear photonics.
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