
Proceedings Paper
Photonics studies on dilute nitrides at long wavelength for telecommunicationFormat | Member Price | Non-Member Price |
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Paper Abstract
By adding a little nitrogen in InGaAs / GaAs quantum well (QW), a strong bandgap-bowing in the QW is
caused. However, the incorporation of nitrogen results in lower photonuminescence intensity and wider line
width as a result of increased non-radiative centers. In order to increase the efficiency of radiative
recombination and hence reduce the laser threshold, a post-growth heat treatment has to be applied. Such kind
of heat treatment results in a big blue shift due to interdiffusion and other effects. During growth, in order to
incorporate nitrogen into InGaAs, the growth temperature is much lower than normal InGaAs growth. Large
number of point defects is induced under such low temperature. This is the main cause of the interdiffusion at
the interfaces of InGaAsN / GaAs QW. There are some other facts to cause the blue shift during heat
treatment, such as local neighbourhood redistribution called short range ordered. In our study, different blue
shift behaviors were clearly observed due to different blue shift mechanism. Post-growth heat treatment also
affects the laser performance dramatically. Lower temperature treatment mainly decreases the absorption loss
and higher temperature treatment improves the conductivity of the cladding layers. Different heat treatment
also results in very different burn-in behavior. An optimized heat treatment will be concluded after the
annealing discussion on laser devices. In order to assure longer emission wavelength well as higher
emission efficiency, many efforts have been tried and will be discussed in this paper.
Paper Details
Date Published: 19 November 2007
PDF: 12 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67821M (19 November 2007); doi: 10.1117/12.754554
Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)
PDF: 12 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67821M (19 November 2007); doi: 10.1117/12.754554
Show Author Affiliations
C. S. Peng, Tampere Univ. of Technology (Finland)
M. Pessa, Tampere Univ. of Technology (Finland)
Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)
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