Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities

P-M. Coulon, J. R. Pugh, M. Athanasiou, G. Kusch, E. D. Le Boulbar, A. Sarua, R. Smith, R. W. Martin, T. Wang, M. Cryan, D.W.E. Allsopp, P. A. Shields

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Microcavities based on group-III nitride material offer a notable platform for the investigation of light-matter interactions as well as the development of devices such as high efficiency light emitting diodes (LEDs) and low-threshold nanolasers. Disk or tube geometries in particular are attractive for low-threshold lasing applications due to their ability to support high finesse whispering gallery modes (WGMs) and small modal volumes. In this article we present the fabrication of homogenous and dense arrays of axial InGaN/GaN nanotubes via a combination of displacement Talbot lithography (DTL) for patterning and inductively coupled plasma top-down dry-etching. Optical characterization highlights the homogeneous emission from nanotube structures. Power-dependent continuous excitation reveals a non-uniform light distribution within a single nanotube, with vertical confinement between the bottom and top facets, and radial confinement within the active region. Finite-difference time-domain simulations, taking into account the particular shape of the outer diameter, indicate that the cavity mode of a single nanotube has a mixed WGM-vertical Fabry-Perot mode (FPM) nature. Additional simulations demonstrate that the improvement of the shape symmetry and dimensions primarily influence the Q-factor of the WGMs whereas the position of the active region impacts the coupling efficiency with one or a family of vertical FPMs. These results show that regular arrays of axial InGaN/GaN nanotubes can be achieved via a low-cost, fast and large-scale process based on DTL and top-down etching. These techniques open a new perspective for cost effective fabrication of nano-LED and nano-laser structures along with bio-chemical sensing applications.

LanguageEnglish
Pages28246-28257
Number of pages12
JournalOptics Express
Volume25
Issue number23
Early online date31 Oct 2017
DOIs
StatusPublished - 13 Nov 2017

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cavity resonators
nanotubes
whispering gallery modes
optical properties
cavities
light emitting diodes
lithography
etching
fabrication
thresholds
nitrides
lasing
Q factors
flat surfaces
platforms
simulation
tubes
costs
symmetry
geometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities. / Coulon, P-M.; Pugh, J. R.; Athanasiou, M. ; Kusch, G.; Le Boulbar, E. D.; Sarua, A.; Smith, R.; Martin, R. W.; Wang, T.; Cryan, M.; Allsopp, D.W.E.; Shields, P. A.

In: Optics Express, Vol. 25, No. 23, 13.11.2017, p. 28246-28257.

Research output: Contribution to journalArticle

Coulon, P-M, Pugh, JR, Athanasiou, M, Kusch, G, Le Boulbar, ED, Sarua, A, Smith, R, Martin, RW, Wang, T, Cryan, M, Allsopp, DWE & Shields, PA 2017, 'Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities', Optics Express, vol. 25, no. 23, pp. 28246-28257. https://doi.org/10.1364/OE.25.028246
Coulon P-M, Pugh JR, Athanasiou M, Kusch G, Le Boulbar ED, Sarua A et al. Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities. Optics Express. 2017 Nov 13;25(23):28246-28257. https://doi.org/10.1364/OE.25.028246
Coulon, P-M. ; Pugh, J. R. ; Athanasiou, M. ; Kusch, G. ; Le Boulbar, E. D. ; Sarua, A. ; Smith, R. ; Martin, R. W. ; Wang, T. ; Cryan, M. ; Allsopp, D.W.E. ; Shields, P. A. / Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities. In: Optics Express. 2017 ; Vol. 25, No. 23. pp. 28246-28257.
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