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

C. J. Lewins, E. D. Le Boulbar, S. M. Lis, P. R. Edwards, R. W. Martin, P. A. Shields, D. W. E. Allsopp

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Article number044305
Number of pages7
JournalJournal of Applied Physics
Volume116
Issue number4
Early online date24 Jul 2014
DOIs
Publication statusPublished - 2014

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nanorods
light emitting diodes
photonics
crystals
slabs
optical coupling
far fields
crossovers
refractivity
luminescence
waveguides
requirements

Keywords

  • nanorods
  • photonic crystals
  • light emitting diodes
  • III-V semiconductors
  • light diffraction

Cite this

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title = "Strong photonic crystal behavior in regular arrays of core-shell and quantum disc InGaN/GaN nanorod light-emitting diodes",
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.",
keywords = "nanorods, photonic crystals, light emitting diodes , III-V semiconductors, light diffraction",
author = "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.}",
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doi = "10.1063/1.4891236",
language = "English",
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journal = "Journal of Applied Physics",
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Strong photonic crystal behavior in regular arrays of core-shell and quantum disc InGaN/GaN nanorod light-emitting diodes. / Lewins, C. J.; Le Boulbar, E. D.; Lis, S. M.; Edwards, P. R.; Martin, R. W.; Shields, P. A.; Allsopp, D. W. E.

In: Journal of Applied Physics, Vol. 116, No. 4, 044305, 2014.

Research output: Contribution to journalArticle

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T1 - Strong photonic crystal behavior in regular arrays of core-shell and quantum disc InGaN/GaN nanorod light-emitting diodes

AU - Lewins, C. J.

AU - Le Boulbar, E. D.

AU - Lis, S. M.

AU - Edwards, P. R.

AU - Martin, R. W.

AU - Shields, P. A.

AU - Allsopp, D. W. E.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

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