Paper
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 +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Gallium nitride

Phonons

Silica

Photonic crystals

Polarization

Mid-IR

Dispersion

Back to Top