High reflectivity III-nitride UV-C distributed Bragg reflectors for vertical cavity emitting lasers

被引：18
作者：
Franke, A. [1 ]
Hoffmann, M. P. [1 ]
Kirste, R. [2 ]
Bobea, M. [1 ]
Tweedie, J. [2 ]
Kaess, F. [1 ]
Gerhold, M. [3 ]
Collazo, R. [1 ]
Sitar, Z. [1 ]
机构：
[1] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
[2] Adroit Mat Inc, 2054 Kildaire Farm Rd,Suite 205, Cary, NC 27518 USA
[3] Army Res Off, Engn Sci Directorate, POB 12211, Res Triangle Pk, NC 27703 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2016年 / 120卷 / 13期
关键词：
GAN; MICROCAVITIES; WAVELENGTHS; SAPPHIRE; MIRRORS; GROWTH; INDEX; FILMS;
D O I：
10.1063/1.4963831
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
UV-C distributed Bragg reflectors (DBRs) for vertical cavity surface emitting laser applications and polariton lasers are presented. The structural integrity of up to 25 layer pairs of AlN/Al0.65Ga0.35N DBRs is maintained by balancing the tensile and compressive strain present between the single layers of the multilayer stack grown on top of an Al0.85Ga0.35N template. By comparing the structural and optical properties for DBRs grown on low dislocation density AlN and AlGaN templates, the criteria for plastic relaxation by cracking thick nitride Bragg reflectors are deduced. The critical thickness is found to be limited mainly by the accumulated strain energy during the DBR growth and is only negligibly affected by the dislocations. A reflectance of 97.7% at 273 nm is demonstrated. The demonstrated optical quality and an ability to tune the resonance wavelength of our resonators and microcavity structures open new opportunities for UV-C vertical emitters. Published by AIP Publishing.
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页数：5
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