Emission Enhancement of Ge/Si Quantum Dots in Hybrid Structures with Subwavelength Lattice of Al Nanodisks

• Published in: Nanomaterials (Basel, Switzerland) Vol. 13; no. 17; p. 2422
• Main Authors: Zinovyev, Vladimir A., Smagina, Zhanna V., Zinovieva, Aigul F., Bloshkin, Aleksei A., Dvurechenskii, Anatoly V., Rodyakina, Ekaterina E., Stepikhova, Margarita V., Peretokin, Artem V., Novikov, Alexey V.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 25-08-2023; MDPI
• Subjects: Al nanoparticles; Aluminum; Analysis; bound states in the continuum (BICs); Comparative analysis; Electric fields; Emissions; Germanium; Hybrid structures; Lattice vibration; Lattices; Molecular beam epitaxy; Optical properties; Photoluminescence; photonic waveguide modes; Photons; plasmonic; Quantum dots; Radiation; Radiation sources; Resonant interactions; Silicon; Spectra; Spectroscopy; Waveguides; Russia
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano13172422

The effects of resonance interaction of plasmonic and photonic modes in hybrid metal-dielectric structures with square Al nanodisk lattices coupled with a Si waveguide layer were investigated using micro-photoluminescence (micro-PL) spectroscopy. As radiation sources, GeSi quantum dots were embedded in the waveguide. A set of narrow PL peaks superimposed on the broad bands were observed in the range of quantum dot emissions. At optimal parameters of Al nanodisks lattices, almost one order increasing of PL intensity was obtained. The experimental PL spectra are in good agreement with results of theoretical calculations. The realization of high-quality bound states in the continuum was confirmed by a comparative analysis of the experimental spectra and theoretical dispersion dependences. The results demonstrated the perspectives of these type structures for a flat band realization and supporting the slow light.