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Scientific highlights

Correlating structure and optical emission of nanometric Quantum Emitters

QD.jpg

We have measured the cathodoluminescence of individual GaN quantum discs embedded in GaN/AlGaN nanowires. The measured sizes of the individual QDiscs, which could be as small as 1 nm (4 monolayers) were correlated one to one to their emission wavelengths, showing a marked Quantum confined Starck effect and a clear effect of the local strain on the optical properties of QDiscs. The results just appeared in (L. F. Zagonel et al., Nano Letters (2011)). A video of a recent seminar by L. F. Zagonel has been recently released. Read more »

Publications

Tararan, A., et al. Optical gap and optically active intragap defects in cubic BN. Physical Review B 982121, (2018). Download: PhysRevB.98.094106.pdf (2.16 MB)
Kociak, M. & Zagonel, L.F. Cathodoluminescence in the scanning transmission electron microscope. Ultramicroscopy 176, 112-131 (2017). Download: STEMCL_8.pdf (2.43 MB)
Meuret, S., et al. Lifetime Measurements Well below the Optical Diffraction Limit. ACS Photonics (2016).doi:10.1021/acsphotonics.6b00212 Download: ph500141j.pdf (7.44 MB)
Zhang, X., et al. InGaN nanowires with high InN molar fraction: growth, structural and optical properties. Nanotechnology 27, 195704 (2016). Download: nano_27_19_195704.pdf (2.66 MB)
Tizei, L.H.G., et al. A polarity-driven nanometric luminescence asymmetry in AlN/GaN heterostructures. Applied Physics Letters 105, 143106 (2014). Download: Tizei_GaNQWCLAsymmetry_APL_2014.pdf (1.74 MB)
Kociak, M., et al. Seeing and measuring in colours: Electron microscopy and spectroscopies applied to nano-optics. Comptes Rendus Physique 15, 158 - 175 (2014). Download: 1-s2.0-S1631070513001515-main.pdf (2.66 MB)
Tizei, L.H.G., et al. Spatial modulation of above-the-gap cathodoluminescence in InP nanowires. Journal of Physics: Condensed Matter 25, 505303 (2013). Download: Tizei2013_2.pdf (613.65 KB)
Pierret, A., et al. Structural and optical properties of Al x Ga 1- x N nanowires. physica status solidi (RRL) - Rapid Research Letters n/a - n/a (2013).doi:10.1002/pssr.201308009
Tourbot, G., et al. Growth mechanism and properties of InGaN insertions in GaN nanowires. Nanotechnology 23, 135703 (2012). Download: Nanotechnology 2012 Tourbot.pdf (802.75 KB)
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