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Exciton-polariton behaviour in bulk and polycrystalline ZnO

McGlynn, Enda and Fryar, James and Henry, Martin O. and Mosnier, Jean-Paul and Lunney, James G. and O'Mahony, Donagh and de Posada, Eduardo (2003) Exciton-polariton behaviour in bulk and polycrystalline ZnO. Physica B: Condensed Matter, 340-342 . pp. 230-234. ISSN 0921-4526

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Abstract

We report detailed reflectance studies of the exciton–polariton structure of thin film polycrystalline ZnO and comparison with bulk crystal behaviour. Near-normal incidence reflectance spectra of these samples are fitted using a two-band dielectric response function. Our data show that the reflectance data in polycrystalline ZnO differ substantially from the bulk material, with Fabry–Perot oscillations at energies below the transverse A exciton and above the longitudinal B exciton in the films. In the strong interaction regime between these energies no evidence is seen of the normally rapid oscillations associated with the anomalous waves. We demonstrate that the strong interaction of the damped exciton with the photon leads to polaritons in this region with substantial damping such that the Fabry–Perot modes are eliminated. Good qualitative agreement is achieved between the model and data. The importance of the polariton model in understanding the reflectance data of polycrystalline material is clearly seen

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:excitons; polaritons; thin films; ZnO
Subjects:Physical Sciences > Thin films
Physical Sciences > Physics
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.physb.2003.09.019
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:4
Deposited On:26 Oct 2006 by DORAS Administrator. Last Modified 29 Jan 2009 16:04

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