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Proceedings Paper

Numerical modeling of photoluminescence in anisotropic nano-layered aluminum-doped zinc-oxide metamaterial with hyperbolic dispersion
Author(s): Evan Zarate; Natalie Best; Priscilla Kelly; Lyuba Kuznetsova
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Paper Abstract

Aluminum-doped ZnO (AZO), a wide direct bandgap semiconductor which emits laser light in the ultraviolet range at room temperature, presents a promising optical gain material for creating lasers for applications in photonics, information storage, biology and medical therapeutics. AZO exhibits an excitonic photoluminescence peak in the ultraviolet region and a defect related photoluminescence peak in the visible region. In addition, a recently developed aluminum-doped ZnO nano-layered structure has a unique optical property namely that the dispersion of the dielectric constant exhibits an optical topological transition in the isofrequency surface from an ellipsoid to a hyperboloid. This unusual optical property provides a unique opportunity for creating nanoscale cavities with dimensions significantly smaller than the wavelength of light which could lead to potential applications such as efficient and compact ultraviolet lasers and LEDs. In this work, we investigate the photoluminescence properties of the anisotropic nano-layered aluminum-doped zinc oxide. In order to describe the influence of the aluminum dopants, a complete model for photoluminescence based on the set of rate equations for electron-hole recombination is developed. The set of coupled rate equations is solved numerically using the fourth order Runge Kutta technique for various optical pump intensities. Our calculations predict that the near-band-edge intensity increases with the addition of aluminum (aluminum filling factor up to ~3%) which indicates that the band gap energy increases as the aluminum content is increased.

Paper Details

Date Published: 22 February 2017
PDF: 8 pages
Proc. SPIE 10098, Physics and Simulation of Optoelectronic Devices XXV, 100981G (22 February 2017); doi: 10.1117/12.2252657
Show Author Affiliations
Evan Zarate, San Diego State Univ. (United States)
Natalie Best, San Diego State Univ. (United States)
Priscilla Kelly, San Diego State Univ. (United States)
Lyuba Kuznetsova, San Diego State Univ. (United States)

Published in SPIE Proceedings Vol. 10098:
Physics and Simulation of Optoelectronic Devices XXV
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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