Coupling of Germanium Quantum Dots with Collective Sub-radiant Modes of Silicon Nanopillar Arrays

Viktoriia Rutckaia; Frank Heyroth; Georg Schmidt; Alexey Novikov; Mikhail Shaleev; Roman S Savelev; Joerg Schilling; Mihail Petrov

doi:10.1021/acsphotonics.0c01319

Coupling of Germanium Quantum Dots with Collective Sub-radiant Modes of Silicon Nanopillar Arrays

ACS Photonics. 2020 Dec 9;8(1):209-217. doi: 10.1021/acsphotonics.0c01319. eCollection 2021 Jan 20.

Authors

Viktoriia Rutckaia¹, Frank Heyroth², Georg Schmidt³, Alexey Novikov^{4

5}, Mikhail Shaleev⁴, Roman S Savelev⁶, Joerg Schilling¹, Mihail Petrov⁶

Affiliations

¹ Centre for Innovation Competence SiLi-nano, Martin-Luther-University Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Strasse 3, 06120 Halle (Saale), Germany.
² Interdisciplinary center of material science, Martin-Luther-University Halle-Wittenberg, Heinrich-Damerow-Strasse 4, 06120 Halle (Saale), Germany.
³ Institute of Physics, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 3, 06120 Halle (Saale), Germany.
⁴ Institute for Physics of Microstructures of the Russian Academy of Sciences, Academicheskaya Str. 7, Nizhny Novgorod 603950, Russia.
⁵ Lobachevsky University, Gagarin av. 23, Nizhny Novgorod 603950, Russia.
⁶ Department of Physics and Engineering, ITMO University, St. Petersburg 197101, Russia.

Abstract

In this paper, we demonstrate the infrared photoluminescence emission from Ge(Si) quantum dots coupled with collective Mie modes of silicon nanopillars. We show that the excitation of band edge dipolar modes of a linear nanopillar array results in strong reshaping of the photoluminescence spectra. Among other collective modes, the magnetic dipolar mode with the polarization along the array axis contributes the most to the emission spectrum, exhibiting an experimentally measured Q-factor of around 500 for an array of 11 pillars. The results belong to the first experimental evidence of light emission enhancement of quantum emitters applying collective Mie resonances in finite nanoresonators and therefore represent an important contribution to the new field of active all-dielectric meta-optics.