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Proceedings Paper

Arrays of selectively grown GaN micro-pyramids: photonic and optical-frequency phonon properties
Author(s): D. Coquillat; M. Le Vassor d'Yerville; P. Arcade; M. Kazan; C. Liu; I. M. Watson; P. R. Edwards; R. W. Martin; H. M. H. Chong; R. M. De La Rue
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Paper Abstract

An array of GaN micro-pyramids containing a near-surface InxGa1-xN/GaN single quantum well has been fabricated using selective area epitaxial overgrowth above a patterned silica mask. The pyramid array has been studied by means of angle-resolved reflection measurements in the near- and mid- infrared optical ranges. We have found that the periodic array of flat-topped pyramids shows marked resonances in the near-infrared optical range due to resonant Bloch modes within the extraction cone and that the angular dispersion of these modes exhibits strong photonic crystal characteristics. The experimental results are in good agreement with the photonic band structure calculated using a scattering matrix formalism. The mid-infrared optical anisotropy properties of the micro-pyramids were investigated to probe the infrared active phonons of the pyramid array. The A1(LO) phonon of the InxGa1-xN/GaN single quantum well was identified and the InN mole fraction was estimated from the mode behaviour.

Paper Details

Date Published: 21 April 2008
PDF: 8 pages
Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 69890J (21 April 2008); doi: 10.1117/12.785775
Show Author Affiliations
D. Coquillat, Groupe d'Etude des Semiconducteurs, Univ. Montpellier II (France)
M. Le Vassor d'Yerville, Groupe d'Etude des Semiconducteurs, Univ. Montpellier II (France)
P. Arcade, Groupe d'Etude des Semiconducteurs, Univ. Montpellier II (France)
M. Kazan, Groupe d'Etude des Semiconducteurs, Univ. Montpellier II (France)
C. Liu, Univ. of Strathclyde (United Kingdom)
I. M. Watson, Univ. of Strathclyde (United Kingdom)
P. R. Edwards, Univ. of Strathclyde (United Kingdom)
R. W. Martin, Univ. of Strathclyde (United Kingdom)
H. M. H. Chong, Univ. of Glasgow (United Kingdom)
R. M. De La Rue, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 6989:
Photonic Crystal Materials and Devices VIII
Richard M. De La Rue; Ceferino López; Michele Midrio; Pierre Viktorovitch, Editor(s)

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