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Measurement of optical nonlinearities from intersubband transitions in GaN/AlGaN quantum wells at 1.5 μm
Author(s) -
Chen Gang,
Rapaport R.,
Mitrofanov O.,
Gmachl C.,
Ng H. M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200303371
Subject(s) - dephasing , quantum well , excited state , absorption (acoustics) , electron , excitation , optoelectronics , condensed matter physics , materials science , physics , atomic physics , optics , laser , quantum mechanics
We measured the resonant nonlinear optical absorption and refraction due to intersubband transitions in GaN/AlGaN multiple quantum well structures at 1.5 μm. The measured values are much smaller than that predicted by theoretical studies. This is attributed to a larger than expected dephasing of excited electrons. At high excitation intensity, the absorption can be saturated. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)