Strong photonic crystal behavior in regular arrays of core-shell and quantum disc InGaN/GaN nanorod light-emitting diodes

Lewins, C. J. and Le Boulbar, E. D. and Lis, S. M. and Edwards, P. R. and Martin, R. W. and Shields, P. A. and Allsopp, D. W. E. (2014) Strong photonic crystal behavior in regular arrays of core-shell and quantum disc InGaN/GaN nanorod light-emitting diodes. Journal of Applied Physics, 116 (4). 044305. ISSN 0021-8979

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    Abstract

    We show that arrays of emissive nanorod structures can exhibit strong photonic crystal behavior, via observations of the far-field luminescence from core-shell and quantum disc InGaN/GaN nanorods. The conditions needed for the formation of directional Bloch modes characteristic of strong photonic behavior are found to depend critically upon the vertical shape of the nanorod sidewalls. Index guiding by a region of lower volume-averaged refractive index near the base of the nanorods creates a quasi-suspended photonic crystal slab at the top of the nanorods which supports Bloch modes. Only diffractive behavior could be observed without this region. Slab waveguide modelling of the vertical structure shows that the behavioral regime of the emissive nanorod arrays depends strongly upon the optical coupling between the nanorod region and the planar layers below. The controlled crossover between the two regimes of photonic crystal operation enables the design of photonic nanorod structures formed on planar substrates that exploit either behavior depending on device requirements.

    Creators(s): Lewins, C. J., Le Boulbar, E. D., Lis, S. M., Edwards, P. R. ORCID logoORCID: https://orcid.org/0000-0001-7671-7698, Martin, R. W. ORCID logoORCID: https://orcid.org/0000-0002-6119-764X, Shields, P. A. and Allsopp, D. W. E.;
    Item type:Article
    ID code:49269
    Keywords:nanorods, photonic crystals, light emitting diodes , III-V semiconductors, light diffraction, Solid state physics. Nanoscience, Physics and Astronomy(all)
    Subjects:Science > Physics > Solid state physics. Nanoscience
    Department:Faculty of Science > Physics
    Technology and Innovation Centre > Bionanotechnology
    Technology and Innovation Centre > Photonics
    Depositing user: Pure Administrator
    Date deposited:17 Sep 2014 12:57
    Last modified:16 Nov 2020 02:09
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/49269
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