TY - JOUR
T1 - Optimal Design of GaN-AlGaN Bragg-Confined Structures for Intersubband Absorption in the Near-Infrared Spectral Range
AU - Radovanović, Jelena
AU - Milanović, Vitomir
AU - Ikonić, Zoran
AU - Indjin, Dragan
AU - Jovanović, Vladimir
AU - Harrison, Paul
N1 - Funding Information:
The authors are grateful to the Royal Society (U.K.), and the Ministry of Science and Technology (Serbia) for support. Three of the authors, D. Indjin, Z. Ikonić, and P. Harrison, would also like to thank QEDI for advice on software implementation.
PY - 2003/10/1
Y1 - 2003/10/1
N2 - A method is proposed for the design and optimization of structural parameters of GaN-AlGaN Bragg-confined structures with respect to peak intersubband absorption from the ground to the first excited state, 1 → 2 electronic transition, in the near infrared spectral range. An above-the-barrier bound state was used to extend the range of transition energies above the values available in conventional quantum wells. Intrinsic polarization fields and nonparabolicity effects were taken into account. The selection of optimal parameters, maximizing the absorption at wavelengths of 1.55 and 1.3 μm, was performed by using a simulated annealing algorithm, and optimal structures with infinite superlattices as confinement regions were thus designed. These optimal parameters were then used to set realistic, finite structures with a small number of layers, the performance of which was re-evaluated by solving the Schrödinger-Poisson equation self-consistently for a few different levels and profiles of doping.
AB - A method is proposed for the design and optimization of structural parameters of GaN-AlGaN Bragg-confined structures with respect to peak intersubband absorption from the ground to the first excited state, 1 → 2 electronic transition, in the near infrared spectral range. An above-the-barrier bound state was used to extend the range of transition energies above the values available in conventional quantum wells. Intrinsic polarization fields and nonparabolicity effects were taken into account. The selection of optimal parameters, maximizing the absorption at wavelengths of 1.55 and 1.3 μm, was performed by using a simulated annealing algorithm, and optimal structures with infinite superlattices as confinement regions were thus designed. These optimal parameters were then used to set realistic, finite structures with a small number of layers, the performance of which was re-evaluated by solving the Schrödinger-Poisson equation self-consistently for a few different levels and profiles of doping.
KW - Bragg-confined structures
KW - GaN quantum wells
KW - Intersubband absorption
UR - http://www.scopus.com/inward/record.url?scp=0141883986&partnerID=8YFLogxK
U2 - 10.1109/JQE.2003.817584
DO - 10.1109/JQE.2003.817584
M3 - Article
AN - SCOPUS:0141883986
VL - 39
SP - 1297
EP - 1304
JO - IEEE Journal of Quantum Electronics
JF - IEEE Journal of Quantum Electronics
SN - 0018-9197
IS - 10
M1 - 1233734
ER -