Arrays of selectively grown GaN micro-pyramids: photonic and optical-frequency phonon properties

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

doi:10.1117/12.785775

21 April 2008 Arrays of selectively grown GaN micro-pyramids: photonic and optical-frequency phonon properties

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

Author Affiliations +

Proceedings Volume 6989, Photonic Crystal Materials and Devices VIII; 69890J (2008) https://doi.org/10.1117/12.785775
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

An array of GaN micro-pyramids containing a near-surface In_xGa_1-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 In_xGa_1-xN/GaN single quantum well was identified and the InN mole fraction was estimated from the mode behaviour.

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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, and R. M. De La Rue "Arrays of selectively grown GaN micro-pyramids: photonic and optical-frequency phonon properties", Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 69890J (21 April 2008); https://doi.org/10.1117/12.785775

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