Quantum Optoelectronics

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Cavity modes of tapered ZnO nanowires

New Journal of Physics 12 (2010)

Authors:

X Xu, FSF Brossard, DA Williams, DP Collins, MJ Holmes, RA Taylor, X Zhang

Abstract:

We report on a cavity mode mapping of ZnO tapered nanowires using micro-photoluminescence spectroscopy at room temperature. Both the Fabry-Perot (FP) and the whispering gallery (WG) modes are identified in a single wire. The emission spectra from single nanowires comprise regular Lorentzian peaks, which arise from the FP interference between the ends of the nanowire. The overall intensity along the tapered wire varies periodically. This variation is ascribed to WG mode resonances across the nanowire. The results agree well with the theoretical calculations using the finite-difference time-domain method. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
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Optical properties of bulk‐like GaN nanorods grown on Si(111) substrates by rf‐plasma assisted molecular beam epitaxy

physica status solidi (c) Wiley 7:7‐8 (2010) 2211-2213

Authors:

Young S Park, TW Kang, Hyunsik Im, Mark J Holmes, Robert A Taylor
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Strongly coupled single quantum dot in a photonic crystal waveguide cavity

(2010)

Authors:

FSF Brossard, XL Xu, DA Williams, M Hadjipanayi, M Hopkinson, X Wang, RA Taylor
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Quantum confined Stark effect of InGaN/GaN multi-quantum disks grown on top of GaN nanorods.

Nanotechnology 21:11 (2010) 115401

Authors:

Young S Park, Mark J Holmes, Tae W Kang, Robert A Taylor

Abstract:

We have investigated, using micro-photoluminescence, the quantum confined Stark effect in an In(x)Ga(1-x)N/GaN multi-quantum disk structure at the tip of a single GaN nanorod. A strong and sharp emission line from the In(x)Ga(1-x)N/GaN quantum disks near 3.26 eV was observed. The peak energy of the emission line was observed to blue-shift with increasing excitation power, indicating a quantum confined Stark effect. Furthermore, both the blue-shift and the intensity of the emission saturate with increasing excitation power. The temperature-dependence of the 3.26 eV emission line has also been investigated.
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Quantum confined Stark effect of InGaN/GaN multi-quantum disks grown on top of GaN nanorods

Nanotechnology 21:11 (2010)

Authors:

YS Park, MJ Holmes, TW Kang, RA Taylor

Abstract:

We have investigated, using micro-photoluminescence, the quantum confined Stark effect in an InxGa1 - xN/GaN multi-quantum disk structure at the tip of a single GaN nanorod. A strong and sharp emission line from the InxGa1 - xN/GaN quantum disks near 3.26eV was observed. The peak energy of the emission line was observed to blue-shift with increasing excitation power, indicating a quantum confined Stark effect. Furthermore, both the blue-shift and the intensity of the emission saturate with increasing excitation power. The temperature-dependence of the 3.26eV emission line has also been investigated. © 2010 IOP Publishing Ltd.
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