Laser-quality low-loss epitaxial Bragg mirrors exhibiting a broad omnidirectional stop band in the midinfrared at wavelengths around are presented. The mirror layers, composed of PbTe and EuTe, exhibit a high refractive index contrast of 80%. Thus, with only three layer pairs, reflectances higher than 99% are achieved for angles of incidence up to 40° and higher than 98% for angles of incidence up to 60°. The angle dependence of the reflectance is accurately determined by analyzing the width of the cavity resonance in a half-wavelength microcavity, formed by two such Bragg mirrors. The experimentally determined omnidirectional stop bandwidth is as high as 50% of the target wavelength. The results are in good agreement to analytical calculations based on the transfer matrix method.
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31 July 2006
Research Article|
August 02 2006
Highly efficient epitaxial Bragg mirrors with broad omnidirectional reflectance bands in the midinfrared
E. W. Baumgartner;
E. W. Baumgartner
Institut für Halbleiter- und Festkörperphysik,
Johannes Kepler Universität Linz
, A-4040 Linz, Austria
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T. Schwarzl;
T. Schwarzl
a)
Institut für Halbleiter- und Festkörperphysik,
Johannes Kepler Universität Linz
, A-4040 Linz, Austria
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G. Springholz;
G. Springholz
Institut für Halbleiter- und Festkörperphysik,
Johannes Kepler Universität Linz
, A-4040 Linz, Austria
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W. Heiss
W. Heiss
Institut für Halbleiter- und Festkörperphysik,
Johannes Kepler Universität Linz
, A-4040 Linz, Austria
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a)
Electronic mail: thomas.schwarzl@jku.at
Appl. Phys. Lett. 89, 051110 (2006)
Article history
Received:
April 13 2006
Accepted:
June 21 2006
Citation
E. W. Baumgartner, T. Schwarzl, G. Springholz, W. Heiss; Highly efficient epitaxial Bragg mirrors with broad omnidirectional reflectance bands in the midinfrared. Appl. Phys. Lett. 31 July 2006; 89 (5): 051110. https://doi.org/10.1063/1.2335410
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