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Open AccessLetter

The Role of Electron Transfer in the Nonlinear Response of Ge2Sb2Te5-Mediated Plasmonic Dimers

1
Department of Physics and Astronomy, Rice University, 6100 Main St, Houston, TX 77005, USA
2
Department of Electrical and Computer Engineering, Rice University, 6100 Main St, Houston, TX 77005, USA
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(2), 52; https://doi.org/10.3390/photonics6020052
Received: 29 April 2019 / Revised: 13 May 2019 / Accepted: 14 May 2019 / Published: 16 May 2019
Here, we study the possibility of exquisitely selective harmonic generation based on the concept of charge transfer plasmons (CTPs) in bridged nanoparticle assemblies. By choosing plasmonic dimer nanoantenna, as a fundamental member of the nanocluster family, and bridging the capacitive gap space between the proximal nanoparticles with an optothermally controllable substance, we judiciously showed that variations in the generation of third harmonic light in the visible regime can be possible by considering distinct states of the functional bridge. To this end, the conductive connection between the nanoparticles is mediated with Ge2Sb2Te5 (GST) with inherently opposite optical and electrical properties below (dielectric, amorphous state) and above 477 °C (conductive, crystalline state). This helped to actively control the transition of charges across the bridge and thereby control the excitation of CTP resonances and provide a switching feature between dipolar and CTP modes. This versatile approach also allowed for production of the intended harmonic signal at different wavelengths depending on the conductivity of the interparticle nanojunction. View Full-Text
Keywords: charge transfer plasmons; phase-change material; Ge2Sb2Te5; harmonic generation; nonlinear plasmonics charge transfer plasmons; phase-change material; Ge2Sb2Te5; harmonic generation; nonlinear plasmonics
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Gerislioglu, B.; Ahmadivand, A. The Role of Electron Transfer in the Nonlinear Response of Ge2Sb2Te5-Mediated Plasmonic Dimers. Photonics 2019, 6, 52.

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